POSE AWARE FINE-GRAINED VISUAL CLASSIFICATION USING POSE EXPERTS. Ayush Chopra?,1

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POSE AWARE FINE-GRAINED VISUAL CLASSIFICATION USING POSE EXPERTS Kushagra Mahajan?,1 Tarasha Khurana?,1 1 Ayush Chopra?,1 IIIT Delhi 2 Isha Gupta1 Chetan Arora1 Atul Rai2 Staqu Technologies ABSTRACT We focus on the problem of fine-grained visual classification (FGVC). We posit that unreasonable effectiveness of the state-of-the-art in this area is because of similar object categories present in the ImageNet dataset, which allows such models to be pretrained on a much larger set of samples and learn generic features for those object categories. We observe an important and often ignored additional structure present in an FGVC problem: the objects are captured from a small set of viewing angles only. We notice that subtle differences between object categories are difficult to pick from an arbitrary angle but easier to identify from a similar pose. We show in this paper that training specialized pose experts, focusing on classification from a single, fixed pose, and combining them in an ensemble style framework successfully exploits the structure in the problem. We demonstrate the effectiveness of the proposed approach on the benchmark Stanford Cars, FGVC-Aircrafts, and DeepFashion datasets. To highlight the contribution when the target category features may not be available in a pretrained network, we test on footwear class. We contribute a new 1000 object, 12 category footwear dataset, each object captured from 4 different poses and show significant improvement on this dataset. Index Terms Fine Grained Visual Classification, CNN Ensemble, Pose Experts 1. INTRODUCTION Fine-grained visual classification aims at distinguishing objects into their subclasses. For instance, dogs are categorized into different breeds of dogs [1], and birds are categorized into different families of birds [2, 3]. However, fine-grained distinction between objects often requires addressing two contradictory issues: 1) distinguish classes having very subtle differences between them, 2) manage the large intra-class variation that arises due to different shapes as well as poses of the target objects. Though, in principle, automated learning of inter and intra-class variations is possible with an end-to-end deep neural network, doing it in practice for fine-grained classification has been difficult because of lack of large datasets. In our work, we focus on the pose aware dimension of the fine-grained visual classification (FGVC) problem. We? The first three authors have contributed equally. (a) (b) (c) (d) (e) (f) (g) (h) Fig. 1: (a) and (b) shows images of two clogs from different viewpoints. (c) and (d) show images of a clog and a shoe. Notice the difference in (a) and (b) and similarity of (c) and (d). We observe that the objects become easy to identify when seen from a same viewpoint. (e) and (f) shows images of two clogs from same viewpoint. (g) and (h) shows images of a clog and shoe from a same viewpoint. This motivates us to create an ensemble of pose experts each specialized to differentiate between the categories from a specific pose. observe that in most of the FGVC problems, the number of viewpoints are typically few and fixed, for example, frontal, oblique, top view etc. Further, the subtle differences between various object categories are difficult to pick from an arbitrary angle, but become much simpler when done from a similar pose. For example, consider the problem of classification for clogs vs casual shoes as shown in Fig. 1. There are large variations between images of a clog when seen from different viewpoints, while on the other hand, a clog and a shoe may look very similar from different views. However, the task becomes easier if we exploit the pose structure inherent in the problem and see the objects from same pose. The specific contributions of this work are as follows: 1) We hypothesize that the success of the state-of-the-art FGVC techniques is largely due to generic features learnt on a much larger dataset. 2) We propose to exploit the novel pose aware structure for FGVC problems. We show that the proposed model containing an ensemble of pose specializing experts, in conjunction with the pose detection stream improves the state-of-the-art on the standard benchmarks. As the representation of a dataset reduces in ImageNet, the effect of exploiting the pose related cues becomes more profound, confirming our hypothesis above. Note that, in contrast to the state-ofthe-art, we neither align the pose, nor attempt to find parts of the object. 3) To further validate our hypothesis, we contribute a new small dataset containing objects of footwear. We

Input Image Pose Expert 1 Pose Expert 2 Pose Expert n Pose Detector FC FC FC FC k softmax prob. k softmax prob. k softmax prob. n softmax prob. concatenated vector hinge loss k nodes for k classes Fig. 2: Proposed Network Architecture. Here n are the number of poses in input data and k are the number of fine-grained categories. choose the category because of lesser number of samples in the benchmark ImageNet dataset [4]. The contributed dataset contains 1000 annotated images of 12 footwear categories scraped from various online stores. Each object has been captured from 4 different viewpoints: 90 left, 45 left, 45 right and 90 right. The improvement of the proposed technique over state-of-the-art is greater on this dataset compared to the cars and aircrafts datasets. 2. RELATED WORK Fine-grained image classification problems have become popular over the past few years particularly on trees, flowers, leaves, butterflies and dog datasets [1, 5 7]. Compared to generic object recognition, fine-grained recognition benefits more from learning critical parts of the objects that can help align objects of the same class and discriminate between neighbouring classes [7 13]. However unlike our approach, a lot of manual annotation of data is required. Ge et al. [14] use an approach similar to ours where they have partitioned the data into K non-overlapping sets of similar images and learnt an expert DCNN for each set. They achieve state-of-theart results on two datasets: Caltech-UCSD-2011 (CUB200-2011) [3] and Birdsnap [2]. However, they segregate images into subsets based on arbitrary feature distinctions while we exploit the pose variations exclusively. The work of Lin et al. [15] consists of two feature extractor models that obtain local pairwise feature interactions in a translation invariant manner which is particularly useful for fine-grained categorization. It gives 84.1% accuracy on CUB-200-2011 dataset requiring only category labels and no bounding boxes at training time. A major motivation for our work comes from Pose Aware Models (PAMs) for face recognition proposed by Masi et al. [16], an approach that tackles pose variations by multiple pose-specific models and rendered face images, however unlike ours they specifically fix the pose. 3. PROPOSED APPROACH In this paper, we propose the idea of Pose Experts for pose aware fine-grained image classification. We define a Pose Expert as a network trained on pose-specific data from only one particular pose or viewpoint in a fine-grained environment which is essentially, distinctive by class and consistent by pose. The choice of poses is dataset dependent. To aid prediction by the proposed Pose Experts, an additional metanetwork is used which is trained for identifying a specific pose of the supplied image. This Pose Detector maps input images to their respective groundtruth poses, irrespective of their fine-grained category. An ensemble of these networks is used to obtain the final prediction as shown in Fig. 2. Note that, an alternative to the proposed architecture is to use the pose detector followed by the appropriate pose expert sequentially. However, unlike the alternative, the proposed model is trainable end-to-end and gave better performance in our experiments. We give further details of our proposed model below. Network Architecture We have experimented with various shallow (LeNet [17]), deep (AlexNet [18] and VGG16 [19]), and very deep (ResNet-50 and ResNet-101 [20]) CNN architectures. Tests were also carried out with a Reduced VGG16 model, obtained by removing the fc6 and fc7 layers in the original VGG16 model and Reduced Alexnet which was arrived at by removing fc7, the last fully connected layer in AlexNet. For all experiments, we used pretrained ImageNet dataset [4] weights for AlexNet, VGG and ResNet models while finetuning parameters for all layers. LeNet5 was trained from scratch. Various architectures were tested for Pose Experts and Pose Detector networks. VGG16 gave the best result for the Pose Detector branch throughout. Further details and results are provided in the subsequent sections. Feature Concatenation Let the number of poses under examination be n and the number of fine-grained categories be k. For classifying an image from an arbitrary pose, we create an ensemble of n pose experts. For this purpose, a test image is sent as input (not necessarily of the view for which the expert is trained for) to each of the n experts. The k- dimensional vectors containing class-wise confidence scores are concatenated into a single n k dimensional feature vector. n-dimensional score vector from the Pose Detector is then concatenated to form a n k + n dimensional vector. Footwear Dataset 1 We initiated our research using the popular UT-Zappos footwear dataset [21] which has about 50,000 images and provides a significantly large benchmark for analysis. However, the lack of diversity with respect to the poses in the dataset rendered it unfit for use in our research. Consequently, around 1000 images of footwear were scraped from online stores such as amazon corresponding to 12 classes for four different poses. The classes spanned 1 The complete dataset is available at http://www.iiitd.edu.in/ chetan/projects/fashion.

Classes Single Network PE Network LeNet AlexNet VGG16 LeNet AlexNet VGG16 4 72.2 87.3 88.1 80.7 90.5 90.8 8 63.7 74.2 73.2 71.3 82.3 82.7 12 52.1 73.4 72.1 59.6 79.1 79.3 Table 1: Performance of Pose Experts v/s single network for all poses. PE Network denotes Pose Ensemble Network. across: Ankle Boots, Knee High Boots, Formal Shoes, Casual Shoes, Sandals, Slippers, Ballerinas, Boat Shoes, Clogs, Ethnic Chappal, Ethnic Juti, Heels. The four poses used were: Facing Left, Facing Right, Diagonal Facing Left and Diagonal Facing Right. The pose-specific data is mutually exclusive. The images have a plain white background with no occlusion present from any other object and the footwear under consideration occupies a majority portion of the image. We would like to emphasize here that, the dataset size is kept small deliberately, in consonance with the practical requirements of an FGVC problem where the data is typically scarce and hard to collect. Further, the footwear category is chosen to highlight the effect of under represented classes in the ImageNet dataset. Sample images from our dataset are given in the supplementary material. 4. EXPERIMENTS AND RESULTS Pre-defined architectures were used for experimental testing except for the Reduced VGG16 and Reduced Alexnet models. For the benchmark datasets, we use two protocols for evaluation: one where the object-level bounding box is not provided either at training or testing time i.e. \bbox, and the other bbox where object-level bounding box is used in both phases. We augmented the data using techniques like resizing, adding salt and pepper noise and blurring. Since our problem involved pose monitoring, we did not apply the most common augmentation strategies like flipping and rotation for pose experts as that could alter the inherent pose-based nature of the problem. However, we have used flipping and rotation while augmenting data for training the compared techniques. We emphasize here that curation of the datasets into different poses, where an unambiguous and definite pose structure is present is not expensive as many pose aware datasets like the Pose Aware Person Dataset [22] are available. Modeling the pose is an important characteristic for reducing problem complexity and is much easier than the effort required in part based annotation in many state of the art techniques which gives only a comparable accuracy. 4.1. Analysis and Characterization Pose Experts v/s Single Network: One of the main hypotheses of the current work is to establish the effectiveness Classes Single Network PE Network R-AlexNet R-VGG16 R-AlexNet R-VGG16 4 88.3 88.8 93.1 94.1 8 77.5 78.6 84.5 86.3 12 76.2 77.5 82.6 83.5 Table 2: Usefulness of pose experts with reduced (R) networks. birds cars aircrafts \bbox bbox \bbox bbox \bbox bbox Proposed 76.3 78.4 87.9 92.0 82.5 83.9 BCNN [15] \ft 80.1 81.3 83.9-78.4 - BCNN [15] ft 84.1 85.1 91.3-84.1 - BGL [23] 75.9 80.4 86.0 90.5 - - MixDCNN [14] - 81.1 - - - - SCDA [24] 80.5-85.9-79.5 - Table 3: Performance comparison with state-of-the-art on standard datasets. \ft denotes without finetuning. of training and merging multiple pose experts to outperform a single network on a dataset that contains images distinctly segregable based on their pose. We validate the hypothesis first on the Footwear dataset. In the first set of experiments, we trained single networks that received 600 distinct images, 150 from each pose. Each of the pose experts were trained with the 150 images corresponding to the pose they are specializing in. Note that, in this experiment, each of the pose expert network was also based on one of the standard larger network architectures. Table 1 reports the results. Shallow Pose Experts: The proposed work also indicates the viability of replacing a state-of-the-art single deep network (with large number of trainable parameters) with an ensemble of shallow pose experts that can be trained efficiently with extremely small datasets, and still perform at par or better than the deep network. We have used Reduced AlexNet and Reduced VGG16 as representatives of the shallow networks, in which the last fully-connected layers have been removed. Since most of the parameters lie in the fullyconnected layers, this leads to a significant decrease in trainable parameters. Table 2 reports the results. 4.2. Comparison with the State-of-the-Art For comparisons in this section, we use Reduced VGG16 network for pose experts in the footwear dataset, and VGG16 network for the same in the benchmark datasets. Our architecture involves very few trainable parameters in comparison to the state-of-the-art such as BCNN [15] which has a high dimensional (512 512) bilinear vector, obtained after taking an outer product of the feature vectors. Table 3

shows the comparison. More details on experiments and the quality of features learnt by our model are available at the project page http://www.iiitd.edu.in/ chetan/ projects/fashion. Footwear Dataset On the Footwear dataset, Bilinear CNN (DD) without finetuning, yields a best accuracy of 78.64% for 12 classes with 4 poses. On finetuning, this increases to 81.1%, which is about 2.5% lower than our best result of 83.5% using R-VGG16 as highlighted in Table 2. All experiments on our dataset have been carried out with images of size 224 224 while Bilinear CNN is trained on images of twice the resolution i.e. 448 448. When we adopt a resolution of 448 448 in our model, we get a further increase in the accuracy by 0.7%. FGVC-Aircrafts Dataset The FGVC-Aircrafts dataset [25] consists of 10,000 images of aircrafts spanning 100 models. Images are divided into 2 poses: left facing and right facing. One can argue that complementary images from these 2 poses could have been generated by flipping the training data. However, our hypothesis is that training a single network for both views is a sub-optimal choice when the number of samples are few and inter-class variance is low. Our model outperforms the single network which gives an accuracy of 74.1% by nearly 8.5%. Bilinear CNN [15] gives an accuracy of 84.1% on the dataset. Our model is able to perform better than the SCDA approach [24]. When bounding boxes are used, the result from our model improves to 83.9% from 82.5%. We observe the maximum improvement from the single network performance on this dataset. We speculate that minimal representation of aircrafts in ImageNet does not allow the networks pretrained on ImageNet to learn generic features of the object. Given only a smaller dataset, the importance of pose-aware training increases even more. Stanford Cars Dataset Stanford Cars dataset [26] contains 16,185 images of 196 car categories. Images from this dataset were divided into 3 poses: front facing, side facing and back facing. Trends obtained for the cars dataset are similar to those obtained in the case of aircrafts. Our model again performs well on this dataset due to the pose structure in the data. We outdo the single VGG16 network (best performing single network with accuracy 79.8%) using our approach by nearly 8.1%. BGL [23] and SCDA [24] are both outperformed by a margin of about 2% each. Results with bounding box annotation are better by around 4% (at 92.0%), which we speculate are due to more background clutter here compared to any other dataset. CUB200-2011 Dataset CUB200-2011 is a 200 bird species recognition dataset which contains 11,788 images. We segregate the dataset into 3 poses: front, left facing and right facing. On this dataset, we fall slightly short of the state-ofthe-art accuracy as given by [15]. The primary reason for this seems to be the lack of rigidity or consistent poses in the birds dataset. Our pose detector stream also does not give a competent accuracy for the same reason. However, the proposed approach gives similar accuracy as the other state-of-the-art approaches: MixDCNN [14], BGL [23] and SCDA [24]. 4.3. Application to Clothing Classification We test our model on clothing classification using the Deep- Fashion Attribute Prediction dataset [27] with two protocols. DeepFashion has 50 category labels with bounding box annotations, which we use to crop out a particular class at a time. We segregate the cropped images into three poses: front, back and side automatically using image meta-data, and perform classification using our model as well as that of BCNN [15]. In the first protocol, we take the entire category set of 50 labels. BCNN performs at 53.4% whereas our ensemble gives 55.7% (Front: 61.8%, Back: 58.2%, Side: 50.5%). Our pose isolation model is able to give significant improvement in the side pose category classification which is a considerably difficult problem for the fashion domain. We also tested on a variant of the dataset where we grouped together visually similar clothing classes, to give a combined set of 19 classes. More details about the new class grouping can be found at the project page. For this experiment, BCNN gave an accuracy of 74.5% while our pose ensemble performs at 79.6% (Front: 85.1%, Back: 81.1%, Side: 72.3%). 5. CONCLUSION We posit that it s harder for a single network, deep or shallow, to overcome large intra-class variance and small inter-class variance, as observed from an arbitrary view, in a data scarce FGVC problem. The problem becomes even harder when the class has limited representation in large benchmark datasets like ImageNet, making it harder to pretrain for generic features. We observe that the classification problem gets significantly simplified when viewing objects from a similar pose. We exploit the observation and train an ensemble of pose experts with an expert for each view. In agreement with our hypothesis, we observe that the proposed approach improves the state-of-the-art by a greater margin as the category becomes more and more under-represented in ImageNet. The under-representation forces the models to learn new features from the relatively small number of fine-grained samples. The exploitation of structure in the data, such as pose, therefore becomes even more important.

6. REFERENCES [1] Omkar M Parkhi, Andrea Vedaldi, Andrew Zisserman, and CV Jawahar, Cats and dogs, in CVPR. IEEE, 2012, pp. 3498 3505. [2] Thomas Berg, Jiongxin Liu, Seung Woo Lee, Michelle L Alexander, David W Jacobs, and Peter N Belhumeur, Birdsnap: Large-scale fine-grained visual categorization of birds, in CVPR, 2014, pp. 2011 2018. [3] C. Wah, S. Branson, P. Welinder, P. Perona, and S. Belongie, The Caltech-UCSD Birds-200-2011 Dataset, Tech. Rep. CNS-TR-2011-001, Caltech, 2011. [4] Jia Deng, Wei Dong, Richard Socher, Li-Jia Li, Kai Li, and Li Fei-Fei, Imagenet: A large-scale hierarchical image database, in CVPR. IEEE, 2009, pp. 248 255. [5] Yuning Chai, Victor Lempitsky, and Andrew Zisserman, Symbiotic segmentation and part localization for finegrained categorization, in ICCV, 2013, pp. 321 328. [6] Neeraj Kumar, Peter Belhumeur, Arijit Biswas, David Jacobs, WJWJ Kress, Ida Lopez, and João Soares, Leafsnap: A computer vision system for automatic plant species identification, ECCV, pp. 502 516, 2012. [7] Ning Zhang, Jeff Donahue, Ross Girshick, and Trevor Darrell, Part-based R-CNNs for fine-grained category detection, in ECCV. Springer, 2014, pp. 834 849. [8] Jia Deng, Jonathan Krause, and Li Fei-Fei, Finegrained crowdsourcing for fine-grained recognition, in CVPR, 2013, pp. 580 587. [9] Ryan Farrell, Om Oza, Ning Zhang, Vlad I Morariu, Trevor Darrell, and Larry S Davis, Birdlets: Subordinate categorization using volumetric primitives and pose-normalized appearance, in ICCV. IEEE, 2011, pp. 161 168. [10] Ning Zhang, Ryan Farrell, and Trever Darrell, Pose pooling kernels for sub-category recognition, in CVPR. IEEE, 2012, pp. 3665 3672. [11] Thomas Berg and Peter N Belhumeur, Poof: Partbased one-vs.-one features for fine-grained categorization, face verification, and attribute estimation, in CVPR, 2013, pp. 955 962. [12] Pedro F Felzenszwalb, Ross B Girshick, David McAllester, and Deva Ramanan, Object detection with discriminatively trained part-based models, TPAMI, vol. 32, no. 9, pp. 1627 1645, 2010. [13] Ross Girshick, Forrest Iandola, Trevor Darrell, and Jitendra Malik, Deformable part models are convolutional neural networks, in CVPR, 2015, pp. 437 446. [14] ZongYuan Ge, Alex Bewley, Christopher McCool, Peter Corke, Ben Upcroft, and Conrad Sanderson, Finegrained classification via mixture of deep convolutional neural networks, in WACV. IEEE, 2016, pp. 1 6. [15] Tsung-Yu Lin, Aruni RoyChowdhury, and Subhransu Maji, Bilinear CNN models for fine-grained visual recognition, in ICCV, 2015, pp. 1449 1457. [16] Iacopo Masi, Stephen Rawls, Gérard Medioni, and Prem Natarajan, Pose-aware face recognition in the wild, in CVPR, 2016, pp. 4838 4846. [17] Yann LeCun, Léon Bottou, Yoshua Bengio, and Patrick Haffner, Gradient-based learning applied to document recognition, Proceedings of the IEEE, vol. 86, no. 11, pp. 2278 2324, 1998. [18] Alex Krizhevsky, Ilya Sutskever, and Geoffrey E Hinton, Imagenet classification with deep convolutional neural networks, in NIPS, 2012, pp. 1097 1105. [19] Karen Simonyan and Andrew Zisserman, Very deep convolutional networks for large-scale image recognition, arxiv preprint arxiv:1409.1556, 2014. [20] Kaiming He, Xiangyu Zhang, Shaoqing Ren, and Jian Sun, Deep residual learning for image recognition, arxiv preprint arxiv:1512.03385, 2015. [21] A. Yu and K. Grauman, Fine-Grained Visual Comparisons with Local Learning, in CVPR, June 2014. [22] Vijay Kumar, Anoop Namboodiri, Manohar Paluri, and CV Jawahar, Pose-aware person recognition, arxiv preprint arxiv:1705.10120, 2017. [23] Feng Zhou and Yuanqing Lin, Fine-grained image classification by exploring bipartite-graph labels, in CVPR, 2016, pp. 1124 1133. [24] Xiu-Shen Wei, Jian-Hao Luo, Jianxin Wu, and Zhi-Hua Zhou, Selective convolutional descriptor aggregation for fine-grained image retrieval, IEEE Trans. on IP, vol. 26, no. 6, pp. 2868 2881, 2017. [25] S. Maji, J. Kannala, E. Rahtu, M. Blaschko, and A. Vedaldi, Fine-grained visual classification of aircraft, Tech. Rep., 2013. [26] Jonathan Krause, Michael Stark, Jia Deng, and Li Fei- Fei, 3D object representations for fine-grained categorization, in ICCV Workshop, 2013, pp. 554 561. [27] Ziwei Liu, Ping Luo, Shi Qiu, Xiaogang Wang, and Xiaoou Tang, DeepFashion: Powering Robust Clothes Recognition and Retrieval with Rich Annotations, in CVPR, 2016. [28] Bolei Zhou et al., Learning deep features for discriminative localization, in CVPR, 2016, pp. 2921 2929.

A. BENCHMARK DATASETS birds Fig. 3: Representative images from FGVC-Aircrafts dataset [25] which was divided into two poses: left facing, right facing. (a) FRONT SIDE (b) BACK FRONT (c) \bbox bbox \bbox bbox \bbox bbox Pose 1 Pose 2 Pose 3 Pose Detector Pose Ensemble Single Net (a) 76.8 77.9 79.1 95.3 78.4 76.4 89.3 88.5 84.3 96.9 87.9 79.8 93.8 92.6 87.5 97.6 92.0-83.2 82.7 98.1 82.5 74.1 85.1 84.3 98.5 83.9 - Table 4: Performance of individual Pose Experts and Pose Detector on the benchmark datasets. \bbox denotes experiments without bounding box annotation. For birds, pose 1, 2 and 3 are front, left, right, for cars these are front, side, back and for aircrafts these are left and right respectively. precision-recall curves across the 4 datasets. Common mistakes made by our network are illustrated in Fig. 7, which is a visual comparison between top two pairs of most confused classes from each of the benchmark datasets used. Their respective confusion matrices are shown in Fig. 5. FRONT Fig. 4: (Left) Representative images from the Stanford Cars dataset [26] which was divided into three poses: front, side, back. (Right) Images from the CUB200-2011 birds dataset [3], divided into three poses: front, left facing, right facing. 75.5 77.1 78.2 93.4 76.3 70.4 SIDE BACK Confusion Matrix for FGVC-Aircrafts 707-320 727-200 737-200 737-300 737-400 737-500 737-600 737-700 737-800 737-900 747-100 747-200 747-300 747-400 757-200 757-300 767-200 767-300 767-400 777-200 777-300 A300B4 A310 A318 A319 A320 A321 A330-200 A330-300 A340-200 A340-300 A340-500 A340-600 A380 ATR-42 ATR-72 An-12 BAE 146-200 BAE 146-300 BAE-125 Beechcraft 1900 Boeing 717 C-130 C-47 CRJ-200 CRJ-700 CRJ-900 Cessna 172 Cessna 208 Cessna 525 Cessna 560 Challenger 600 DC-10 DC-3 DC-6 DC-8 DC-9-30 DH-82 DHC-1 DHC-6 DHC-8-100 DHC-8-300 DR-400 Dornier 328 E-170 E-190 E-195 EMB-120 ERJ 135 ERJ 145 Embraer Legacy 600 Eurofighter Typhoon F-16A/B F/A-18 Falcon 2000 Falcon 900 Fokker 100 Fokker 50 Fokker 70 Global Express Gulfstream IV Gulfstream V Hawk T1 Il-76 L-1011 MD-11 MD-80 MD-87 MD-90 Metroliner Model B200 PA-28 SR-20 Saab 2000 Saab 340 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0.0 0.0 0.0 0.0 0.8 0.0 0.0 0.0 0.0 0.0 (b) (c) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8 0.1 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 707-320 727-200 737-200 737-300 737-400 737-500 737-600 737-700 737-800 737-900 747-100 747-200 747-300 747-400 757-200 757-300 767-200 767-300 767-400 777-200 777-300 A300B4 A310 A318 A319 A320 A321 A330-200 A330-300 A340-200 A340-300 A340-500 A340-600 A380 ATR-42 ATR-72 An-12 BAE 146-200 BAE 146-300 BAE-125 Beechcraft 1900 Boeing 717 C-130 C-47 CRJ-200 CRJ-700 CRJ-900 Cessna 172 Cessna 208 Cessna 525 Cessna 560 Challenger 600 DC-10 DC-3 DC-6 DC-8 DC-9-30 DH-82 DHC-1 DHC-6 DHC-8-100 DHC-8-300 DR-400 Dornier 328 E-170 E-190 E-195 EMB-120 ERJ 135 ERJ 145 Embraer Legacy 600 Eurofighter Typhoon F-16A/B F/A-18 Falcon 2000 Falcon 900 Fokker 100 Fokker 50 Fokker 70 Global Express Gulfstream IV Gulfstream V Hawk T1 Il-76 L-1011 MD-11 MD-80 MD-87 MD-90 Metroliner Model B200 PA-28 SR-20 Saab 2000 Saab 340 Spitfire Tornado Tu-134 Tu-154 Yak-42 aircrafts smart fortwo Convertible 2012 AM General Hummer SUV 2000 Acura RL Sedan 2012 Acura TL Sedan 2012 Acura TL Type-S 2008 Acura TSX Sedan 2012 Acura Integra Type R 2001 Acura ZDX Hatchback 2012 Aston Martin V8 Vantage Convertible 2012 Aston Martin V8 Vantage Coupe 2012 Aston Martin Virage Convertible 2012 Aston Martin Virage Coupe 2012 Audi RS 4 Convertible 2008 Audi A5 Coupe 2012 Audi TTS Coupe 2012 Audi R8 Coupe 2012 Audi V8 Sedan 1994 Audi 100 Sedan 1994 Audi 100 Wagon 1994 Audi TT Hatchback 2011 Audi S6 Sedan 2011 Audi S5 Convertible 2012 Audi S5 Coupe 2012 Audi S4 Sedan 2012 Audi S4 Sedan 2007 Audi TT RS Coupe 2012 BMW ActiveHybrid 5 Sedan 2012 BMW 1 Series Convertible 2012 BMW 1 Series Coupe 2012 BMW 3 Series Sedan 2012 BMW 3 Series Wagon 2012 BMW 6 Series Convertible 2007 BMW X5 SUV 2007 BMW X6 SUV 2012 BMW M3 Coupe 2012 BMW M5 Sedan 2010 BMW M6 Convertible 2010 BMW X3 SUV 2012 BMW Z4 Convertible 2012 Bentley Continental Supersports Conv. Convertible 2012 Bentley Arnage Sedan 2009 Bentley Mulsanne Sedan 2011 Bentley Continental GT Coupe 2012 Bentley Continental GT Coupe 2007 Bentley Continental Flying Spur Sedan 2007 Bugatti Veyron 16.4 Convertible 2009 Bugatti Veyron 16.4 Coupe 2009 Buick Regal GS 2012 Buick Rainier SUV 2007 Buick Verano Sedan 2012 Buick Enclave SUV 2012 Cadillac CTS-V Sedan 2012 Cadillac SRX SUV 2012 Cadillac Escalade EXT Crew Cab 2007 Chevrolet Silverado 1500 Hybrid Crew Cab 2012 Chevrolet Corvette Convertible 2012 Chevrolet Corvette ZR1 2012 Chevrolet Corvette Ron Fellows Edition Z06 2007 Chevrolet Traverse SUV 2012 Chevrolet Camaro Convertible 2012 Chevrolet HHR SS 2010 Chevrolet Impala Sedan 2007 Chevrolet Tahoe Hybrid SUV 2012 Chevrolet Sonic Sedan 2012 Chevrolet Express Cargo Van 2007 Chevrolet Avalanche Crew Cab 2012 Chevrolet Cobalt SS 2010 Chevrolet Malibu Hybrid Sedan 2010 Chevrolet TrailBlazer SS 2009 Chevrolet Silverado 2500HD Regular Cab 2012 Chevrolet Silverado 1500 Classic Extended Cab 2007 Chevrolet Express Van 2007 Chevrolet Monte Carlo Coupe 2007 Chevrolet Malibu Sedan 2007 Chevrolet Silverado 1500 Extended Cab 2012 Chevrolet Silverado 1500 Regular Cab 2012 Chrysler Aspen SUV 2009 Chrysler Sebring Convertible 2010 Chrysler Town and Country Minivan 2012 Chrysler 300 SRT-8 2010 Chrysler Crossfire Convertible 2008 Chrysler PT Cruiser Convertible 2008 Daewoo Nubira Wagon 2002 Dodge Caliber Wagon 2012 Dodge Caliber Wagon 2007 Dodge Caravan Minivan 1997 Dodge Ram Pickup 3500 Crew Cab 2010 Dodge Ram Pickup 3500 Quad Cab 2009 Dodge Sprinter Cargo Van 2009 Dodge Journey SUV 2012 Dodge Dakota Crew Cab 2010 Dodge Dakota Club Cab 2007 Dodge Magnum Wagon 2008 Dodge Challenger SRT8 2011 Dodge Durango SUV 2012 Dodge Durango SUV 2007 Dodge Charger Sedan 2012 Dodge Charger SRT-8 2009 Eagle Talon Hatchback 1998 FIAT 500 Abarth 2012 FIAT 500 Convertible 2012 Ferrari FF Coupe 2012 Ferrari California Convertible 2012 Ferrari 458 Italia Convertible 2012 Ferrari 458 Italia Coupe 2012 Fisker Karma Sedan 2012 Ford F-450 Super Duty Crew Cab 2012 Ford Mustang Convertible 2007 Ford Freestar Minivan 2007 Ford Expedition EL SUV 2009 Ford Edge SUV 2012 Ford Ranger SuperCab 2011 Ford GT Coupe 2006 Ford F-150 Regular Cab 2012 Ford F-150 Regular Cab 2007 Ford Focus Sedan 2007 Ford E-Series Wagon Van 2012 Ford Fiesta Sedan 2012 GMC Terrain SUV 2012 GMC Savana Van 2012 GMC Yukon Hybrid SUV 2012 GMC Acadia SUV 2012 GMC Canyon Extended Cab 2012 Geo Metro Convertible 1993 HUMMER H3T Crew Cab 2010 HUMMER H2 SUT Crew Cab 2009 Honda Odyssey Minivan 2012 Honda Odyssey Minivan 2007 Honda Accord Coupe 2012 Honda Accord Sedan 2012 Hyundai Veloster Hatchback 2012 Hyundai Santa Fe SUV 2012 Hyundai Tucson SUV 2012 Hyundai Veracruz SUV 2012 Hyundai Sonata Hybrid Sedan 2012 Hyundai Elantra Sedan 2007 Hyundai Accent Sedan 2012 Hyundai Genesis Sedan 2012 Hyundai Sonata Sedan 2012 Hyundai Elantra Touring Hatchback 2012 Hyundai Azera Sedan 2012 Infiniti G Coupe IPL 2012 Infiniti QX56 SUV 2011 Isuzu Ascender SUV 2008 Jaguar XK XKR 2012 Jeep Patriot SUV 2012 Jeep Wrangler SUV 2012 Jeep Liberty SUV 2012 Jeep Grand Cherokee SUV 2012 Jeep Compass SUV 2012 Lamborghini Reventon Coupe 2008 Lamborghini Aventador Coupe 2012 Lamborghini Gallardo LP 570-4 Superleggera 2012 Lamborghini Diablo Coupe 2001 Land Rover Range Rover SUV 2012 Land Rover LR2 SUV 2012 Lincoln Town Car Sedan 2011 MINI Cooper Roadster Convertible 2012 Maybach Landaulet Convertible 2012 Mazda Tribute SUV 2011 McLaren MP4-12C Coupe 2012 Mercedes-Benz 300-Class Convertible 1993 Mercedes-Benz C-Class Sedan 2012 Mercedes-Benz SL-Class Coupe 2009 Mercedes-Benz E-Class Sedan 2012 Mercedes-Benz S-Class Sedan 2012 Mercedes-Benz Sprinter Van 2012 Mitsubishi Lancer Sedan 2012 Nissan Leaf Hatchback 2012 Nissan NV Passenger Van 2012 Nissan Juke Hatchback 2012 Nissan 240SX Coupe 1998 Plymouth Neon Coupe 1999 Porsche Panamera Sedan 2012 Ram C/V Cargo Van Minivan 2012 Rolls-Royce Phantom Drophead Coupe Convertible 2012 Rolls-Royce Ghost Sedan 2012 Rolls-Royce Phantom Sedan 2012 Scion xd Hatchback 2012 Spyker C8 Convertible 2009 Spyker C8 Coupe 2009 Suzuki Aerio Sedan 2007 Suzuki Kizashi Sedan 2012 Suzuki SX4 Hatchback 2012 Suzuki SX4 Sedan 2012 Tesla Model S Sedan 2012 Toyota Sequoia SUV 2012 Toyota Camry Sedan 2012 Toyota Corolla Sedan 2012 Toyota 4Runner SUV 2012 Volkswagen Golf Hatchback 2012 Volkswagen Golf Hatchback 1991 Volkswagen Beetle Hatchback 2012 Volvo C30 Hatchback 2012 Volvo 240 Sedan 1993 Volvo XC90 SUV 2007 C 1.0 M C 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 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Convertible 2012 Audi S5 Coupe 2012 Audi S4 Sedan 2012 Audi S4 Sedan 2007 Audi TT RS Coupe 2012 BMW ActiveHybrid 5 Sedan 2012 BMW 1 Series Convertible 2012 BMW 1 Series Coupe 2012 BMW 3 Series Sedan 2012 BMW 3 Series Wagon 2012 BMW 6 Series Convertible 2007 BMW X5 SUV 2007 BMW X6 SUV 2012 BMW M3 Coupe 2012 BMW M5 Sedan 2010 BMW M6 Convertible 2010 BMW X3 SUV 2012 BMW Z4 Convertible 2012 Bentley Continental Supersports Conv. Convertible 2012 Bentley Arnage Sedan 2009 Bentley Mulsanne Sedan 2011 Bentley Continental GT Coupe 2012 Bentley Continental GT Coupe 2007 Bentley Continental Flying Spur Sedan 2007 Bugatti Veyron 16.4 Convertible 2009 Bugatti Veyron 16.4 Coupe 2009 Buick Regal GS 2012 Buick Rainier SUV 2007 Buick Verano Sedan 2012 Buick Enclave SUV 2012 Cadillac CTS-V Sedan 2012 Cadillac SRX SUV 2012 Cadillac Escalade EXT Crew Cab 2007 Chevrolet Silverado 1500 Hybrid Crew Cab 2012 Chevrolet Corvette Convertible 2012 Chevrolet Corvette ZR1 2012 Chevrolet Corvette Ron Fellows Edition Z06 2007 Chevrolet Traverse SUV 2012 Chevrolet Camaro Convertible 2012 Chevrolet HHR SS 2010 Chevrolet Impala Sedan 2007 Chevrolet Tahoe Hybrid SUV 2012 Chevrolet Sonic Sedan 2012 Chevrolet Express Cargo Van 2007 Chevrolet Avalanche Crew Cab 2012 Chevrolet Cobalt SS 2010 Chevrolet Malibu Hybrid Sedan 2010 Chevrolet TrailBlazer SS 2009 Chevrolet Silverado 2500HD Regular Cab 2012 Chevrolet Silverado 1500 Classic Extended Cab 2007 Chevrolet Express Van 2007 Chevrolet Monte Carlo Coupe 2007 Chevrolet Malibu Sedan 2007 Chevrolet Silverado 1500 Extended Cab 2012 Chevrolet Silverado 1500 Regular Cab 2012 Chrysler Aspen SUV 2009 Chrysler Sebring Convertible 2010 Chrysler Town and Country Minivan 2012 Chrysler 300 SRT-8 2010 Chrysler Crossfire Convertible 2008 Chrysler PT Cruiser Convertible 2008 Daewoo Nubira Wagon 2002 Dodge Caliber Wagon 2012 Dodge Caliber Wagon 2007 Dodge Caravan Minivan 1997 Dodge Ram Pickup 3500 Crew Cab 2010 Dodge Ram Pickup 3500 Quad Cab 2009 Dodge Sprinter Cargo Van 2009 Dodge Journey SUV 2012 Dodge Dakota Crew Cab 2010 Dodge Dakota Club Cab 2007 Dodge Magnum Wagon 2008 Dodge Challenger SRT8 2011 Dodge Durango SUV 2012 Dodge Durango SUV 2007 Dodge Charger Sedan 2012 Dodge Charger SRT-8 2009 Eagle Talon Hatchback 1998 FIAT 500 Abarth 2012 FIAT 500 Convertible 2012 Ferrari FF Coupe 2012 Ferrari California Convertible 2012 Ferrari 458 Italia Convertible 2012 Ferrari 458 Italia Coupe 2012 Fisker Karma Sedan 2012 Ford F-450 Super Duty Crew Cab 2012 Ford Mustang Convertible 2007 Ford Freestar Minivan 2007 Ford Expedition EL SUV 2009 Ford Edge SUV 2012 Ford Ranger SuperCab 2011 Ford GT Coupe 2006 Ford F-150 Regular Cab 2012 Ford F-150 Regular Cab 2007 Ford Focus Sedan 2007 Ford E-Series Wagon Van 2012 Ford Fiesta Sedan 2012 GMC Terrain SUV 2012 GMC Savana Van 2012 GMC Yukon Hybrid SUV 2012 GMC Acadia SUV 2012 GMC Canyon Extended Cab 2012 Geo Metro Convertible 1993 HUMMER H3T Crew Cab 2010 HUMMER H2 SUT Crew Cab 2009 Honda Odyssey Minivan 2012 Honda Odyssey Minivan 2007 Honda Accord Coupe 2012 Honda Accord Sedan 2012 Hyundai Veloster Hatchback 2012 Hyundai Santa Fe SUV 2012 Hyundai Tucson SUV 2012 Hyundai Veracruz SUV 2012 Hyundai Sonata Hybrid Sedan 2012 Hyundai Elantra Sedan 2007 Hyundai Accent Sedan 2012 Hyundai Genesis Sedan 2012 Hyundai Sonata Sedan 2012 Hyundai Elantra Touring Hatchback 2012 Hyundai Azera Sedan 2012 Infiniti G Coupe IPL 2012 Infiniti QX56 SUV 2011 Isuzu Ascender SUV 2008 Jaguar XK XKR 2012 Jeep Patriot SUV 2012 Jeep Wrangler SUV 2012 Jeep Liberty SUV 2012 Jeep Grand Cherokee SUV 2012 Jeep Compass SUV 2012 Lamborghini Reventon Coupe 2008 Lamborghini Aventador Coupe 2012 Lamborghini Gallardo LP 570-4 Superleggera 2012 Lamborghini Diablo Coupe 2001 Land Rover Range Rover SUV 2012 Land Rover LR2 SUV 2012 Lincoln Town Car Sedan 2011 MINI Cooper Roadster Convertible 2012 Maybach Landaulet Convertible 2012 Mazda Tribute SUV 2011 McLaren MP4-12C Coupe 2012 Mercedes-Benz 300-Class Convertible 1993 Mercedes-Benz C-Class Sedan 2012 Mercedes-Benz SL-Class Coupe 2009 Mercedes-Benz E-Class Sedan 2012 Mercedes-Benz S-Class Sedan 2012 Mercedes-Benz Sprinter Van 2012 Mitsubishi Lancer Sedan 2012 Nissan Leaf Hatchback 2012 Nissan NV Passenger Van 2012 Nissan Juke Hatchback 2012 Nissan 240SX Coupe 1998 Plymouth Neon Coupe 1999 Porsche Panamera Sedan 2012 Ram C/V Cargo Van Minivan 2012 Rolls-Royce Phantom Drophead Coupe Convertible 2012 Rolls-Royce Ghost Sedan 2012 Rolls-Royce Phantom Sedan 2012 Scion xd Hatchback 2012 Spyker C8 Convertible 2009 Spyker C8 Coupe 2009 Suzuki Aerio Sedan 2007 Suzuki Kizashi Sedan 2012 Suzuki SX4 Hatchback 2012 Suzuki SX4 Sedan 2012 Tesla Model S Sedan 2012 Toyota Sequoia SUV 2012 Toyota Camry Sedan 2012 Toyota Corolla Sedan 2012 Toyota 4Runner SUV 2012 Volkswagen Golf Hatchback 2012 Volkswagen Golf Hatchback 1991 Volkswagen Beetle Hatchback 2012 Volvo C30 Hatchback 2012 Volvo 240 Sedan 1993 Volvo XC90 SUV 2007 Benchmark datasets used in the research were segregated pose-wise to suit the needs of the proposed model. CUB2002011 is a bird species recognition dataset which was segregated into 3 poses: front facing, left facing and right facing. The FGVC-Aircrafts dataset has been divided into 2 poses: left facing and right facing, while the Stanford Cars dataset is divided into 3 poses: front facing, side facing and back facing. Representative images from these datasets are shown in Fig. 3 and Fig. 4. cars Con us on Ma x o S an o d Ca s C M CUB C M w D B. FOOTWEAR DATASET A contribution of this paper is the pose aware Footwear dataset of 1000 images, spanning 12 footwear classes. Representative image of our dataset is shown in Fig. 6. C. COMPARISON WITH STATE-OF-THE-ART For all the benchmark datasets, individual pose expert accuracies and pose detector performance, their ensemble comparison with the corresponding single network using VGG16, have been mentioned in Table 4. Fig. 8 shows the average 00 02 04 06 08 10 F g 5 No ma zed con us on ma ces o FGVC A c a s S an o d Ca s CUB200 2011 and ou Foo wea da ase s P ease zoom n he pd o ead he fine ex n he ma ces

Boat Shoes Ballerinas Boots Boots (ankle) (high) Casual Shoes Clogs Ethnic Chappal Ethnic Juti Formal Shoes Heels Sandals Slippers Fig. 6: Representative images from the contributed footwear dataset. Please refer to the main paper for details of the dataset. class C-47 DC-3 A340-200 A340-300 Chevrolet Express Cargo Van 2007 Chevrolet Express Van 2007 HUMMER H3T Crew Cab 2010 HUMMER H2 SUT Crew Cab 2009 Least Flycatcher Yellow Bellied Flycatcher Baird Sparrow Henslow Sparrow Knee High Boots Ankle Boots Ethnic Juti Ballerinas Fig. 7: Top two pairs of classes that are most confused with each other from each of the 4 datasets, one dataset per row. Each row contains sample images from the test set which are most commonly confused with the class of the neighbouring column. Comparison betweeen Precision-Recall Curves on the 4 Datasets 1.0 Precision 0.8 0.6 0.0 0.0 FGVC-Aircraft CUB Birds Stanford Cars Footwear 0.2 Parka, Anorak, Jacket, Bomber Hoodie Peacoat, Blazer, Coat Sweater, Cardigan, Turtleneck Button Down, Flannel Henley, Tee, Top, Jersey, Blouse, Halter, Tank Chinos Culottes Skirt Cutoffs, Shorts, Sweatshorts, Trunks Jeans, Jeggings, Capris Joggers, Jodhpurs, Leggings Sarongs Gauchos Caftan, Kaftan, Kimono, Cape, Coverup, Poncho Jump-suit Dress, Romper, Sundress, Shirtdress Nightdress, Robe Onesie Table 5: Grouped category set for the experiment on 19 classes of the DeepFashion Attribute Prediction dataset. 0.4 0.2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 grouped categories 0.4 Recall 0.6 0.8 1.0 Fig. 8: Comparison of the precision-recall curves for the 4 datasets. C.1. Application on Clothing Classification using DeepFashion For a grouped category set of 19 classes from the DeepFashion Attribute Prediction dataset [27], category combinations are given in Table 5. C.2. Visualization We use activation maps to highlight the quality of features being learnt by our networks, and help in visualizing how well the pose experts are able to localize the discriminative image regions which could vary in different poses of the same object. Fig. 9 shows the sample class activation maps for the 4 datasets - footwear, birds, aircrafts, cars respectively - and how the discriminative regions change with the viewpoints. In the first two images of the second row, two different poses of birds of the class Blue Jay from CUB200-2011 dataset focus on different features; beak, feet and tail in the first image whereas wings in the second image. Similarly, in the next two images containing Chevrolet Traverse SUV 2012 from the Stanford Cars dataset, the pose experts seem to focus on the front and hind wheels, backlight and roof in the first image

low activation high activation Fig. 9: Class Activation Maps. First row shows the activation maps from each of the 4 datasets. Second row shows 2 pairs of images, each pair belonging to a particular class, with different viewpoints and the variation in their discriminative regions. This discriminative information in different poses is directly used by our Pose Experts. whereas the headlight and logo in the second image. These images have been generated using the technique suggested by Zhou et al. [28].