Automated analysis of microscopic images of cellular tissues

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1 Automated analysis of microscopic images of cellular tissues Rutger Slooter December 8, 2017 Master Thesis Applied Mathematics 1

2 Overview The problem Master Thesis Applied Mathematics 2

3 Overview The problem Initial impressions Master Thesis Applied Mathematics 2

4 Overview The problem Initial impressions Real space Master Thesis Applied Mathematics 2

5 Overview The problem Initial impressions Real space Watershed segmentation Local extrema Current Development Master Thesis Applied Mathematics 2

6 Overview The problem Initial impressions Real space Watershed segmentation Local extrema Current Development Conclusion Master Thesis Applied Mathematics 2

7 The problem Microscope images of potato slices. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

8 The problem Microscope images of potato slices. Important features: Individual cells. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

9 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Introduction - Watershed - Local extrema - Current Development - Conclusion 3

10 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Average size. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

11 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Average size. Average eccentricity. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

12 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Average size. Average eccentricity. Orientation. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

13 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Average size. Average eccentricity. Orientation. Beyond that we also want to know the variation. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

14 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Average size. Average eccentricity. Orientation. Beyond that we also want to know the variation. And when possible. Cell wall thickness. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

15 The problem Microscope images of potato slices. Important features: Individual cells. So what do we want to do with the cells in the microscope images? Average size. Average eccentricity. Orientation. Beyond that we also want to know the variation. And when possible. Cell wall thickness. i.e. we want to determine cell statistics. Introduction - Watershed - Local extrema - Current Development - Conclusion 3

16 Why is this a problem? Figure 1: An example of a microscope image. Note that here the best area of a larger image is selected. Introduction - Watershed - Local extrema - Current Development - Conclusion 4

17 Some first impressions We have: Introduction - Watershed - Local extrema - Current Development - Conclusion 5

18 Some first impressions We have: Brightness of the pixels. Introduction - Watershed - Local extrema - Current Development - Conclusion 5

19 Some first impressions We have: Brightness of the pixels. We can see the cells with our own eyes. Introduction - Watershed - Local extrema - Current Development - Conclusion 5

20 Some first impressions We have: Brightness of the pixels. We can see the cells with our own eyes. Two main options: Introduction - Watershed - Local extrema - Current Development - Conclusion 5

21 Some first impressions We have: Brightness of the pixels. We can see the cells with our own eyes. Two main options: Work with the real image, which we call Real Space Introduction - Watershed - Local extrema - Current Development - Conclusion 5

22 Some first impressions We have: Brightness of the pixels. We can see the cells with our own eyes. Two main options: Work with the real image, which we call Real Space Work with a Fourier transformed image, in Frequency Space Introduction - Watershed - Local extrema - Current Development - Conclusion 5

23 Real space analysis From the thesis by Peter Iles [1] we have also seen a method concerning the real image. Introduction - Watershed - Local extrema - Current Development - Conclusion 6

24 Real space analysis From the thesis by Peter Iles [1] we have also seen a method concerning the real image. Namely the watershed method, hereto we also point to. Introduction - Watershed - Local extrema - Current Development - Conclusion 6

25 Real space analysis From the thesis by Peter Iles [1] we have also seen a method concerning the real image. Namely the watershed method, hereto we also point to. Robust Muscle Cell Segmentation using Region Selection with Dynamic Programming, by F. Liu et al. [2]. Introduction - Watershed - Local extrema - Current Development - Conclusion 6

26 Real space analysis From the thesis by Peter Iles [1] we have also seen a method concerning the real image. Namely the watershed method, hereto we also point to. Robust Muscle Cell Segmentation using Region Selection with Dynamic Programming, by F. Liu et al. [2]. Contour Detection and Hierarchical Image Segmentation, P. Arbelez et al. [3]. Introduction - Watershed - Local extrema - Current Development - Conclusion 6

27 Real space analysis From the thesis by Peter Iles [1] we have also seen a method concerning the real image. Namely the watershed method, hereto we also point to. Robust Muscle Cell Segmentation using Region Selection with Dynamic Programming, by F. Liu et al. [2]. Contour Detection and Hierarchical Image Segmentation, P. Arbelez et al. [3]. Geodesic Saliency of Watershed Contours and Hierarchical Segmentation, by L. Najman & M. Schmitt [4]. Introduction - Watershed - Local extrema - Current Development - Conclusion 6

28 Watershed segmentation How does the watershed method work? Introduction - Watershed - Local extrema - Current Development - Conclusion 7

29 Watershed segmentation How does the watershed method work? There are various mechanisms but the key is: Introduction - Watershed - Local extrema - Current Development - Conclusion 7

30 Watershed segmentation How does the watershed method work? There are various mechanisms but the key is: Locate drainage points. Introduction - Watershed - Local extrema - Current Development - Conclusion 7

31 Watershed segmentation How does the watershed method work? There are various mechanisms but the key is: Locate drainage points. Let water flow into the lowest areas. (i.e. the darkest pixels.) Introduction - Watershed - Local extrema - Current Development - Conclusion 7

32 Watershed segmentation How does the watershed method work? There are various mechanisms but the key is: Locate drainage points. Let water flow into the lowest areas. (i.e. the darkest pixels.) When the image is filled stop. Introduction - Watershed - Local extrema - Current Development - Conclusion 7

33 Watershed segmentation How does the watershed method work? There are various mechanisms but the key is: Locate drainage points. Let water flow into the lowest areas. (i.e. the darkest pixels.) When the image is filled stop. Now we have found various segments in the image. Introduction - Watershed - Local extrema - Current Development - Conclusion 7

34 Literature results We look at [2] which uses the Ultrametric Contour Map (UCM) from [3]. An example: Figure 2: Examples of segmentation by UCM. From top to bottom: Image, UCM produced by gpb-owt-ucm, and ODS and OIS segmentations, source [3]. Introduction - Watershed - Local extrema - Current Development - Conclusion 8

35 Literature results cont d Figure 3: Decision tree for the segmentation using the UCM, source [2]. Introduction - Watershed - Local extrema - Current Development - Conclusion 9

36 Literature results cont d Figure 3: Decision tree for the segmentation using the UCM, source [2]. Figure 4: Segmentation results, source [2]. Introduction - Watershed - Local extrema - Current Development - Conclusion 9

37 Contrast enhancement f out (x, y) = e 4m[favg(x,y) f in(x,y)] (1) Introduction - Watershed - Local extrema - Current Development - Conclusion 10

38 Contrast enhancement f out (x, y) = e 4m[favg(x,y) f in(x,y)] (1) Figure 5: Left just a cropped image from Fig. 1. On the right the image, with locally enhanced contrast. We have m = 10 and a radius r of 50 pixels. Introduction - Watershed - Local extrema - Current Development - Conclusion 10

39 Our results Figure 6: Our result for a watershed segmentation. Introduction - Watershed - Local extrema - Current Development - Conclusion 11

40 Local extrema How to find cell centres? Introduction - Watershed - Local extrema - Current Development - Conclusion 12

41 Local extrema How to find cell centres? Convolve the image with a Gaussian peak, i.e. use a Weierstraß transformation. Introduction - Watershed - Local extrema - Current Development - Conclusion 12

42 Local extrema How to find cell centres? Convolve the image with a Gaussian peak, i.e. use a Weierstraß transformation. Locate local maxima or minima on the image. Introduction - Watershed - Local extrema - Current Development - Conclusion 12

43 Transformed image Figure 7: A transformed image, here we have used a Gaussian with σ = 7. Introduction - Watershed - Local extrema - Current Development - Conclusion 13

44 Distinguishability of peaks Figure 8: A numerical solution to the merging of two Gaussian peaks. w is the distance between peaks, m the ratio in amplitude and σ the standard deviation of the Gaussian. Also read [5, 6]. Introduction - Watershed - Local extrema - Current Development - Conclusion 14

45 Choosing σ Figure 9: Here we study the number of detected peaks vs. the standard deviation σ. We choose the value σ = 7. Introduction - Watershed - Local extrema - Current Development - Conclusion 15

46 Choosing σ cont d Figure 10: Using simple geometry we can determine a suitable σ for finding minima. This turns out to be approximately 4. Introduction - Watershed - Local extrema - Current Development - Conclusion 16

47 Results Figure 11: Local extrema. In blue the cell centres, in red the corners of the cells. Introduction - Watershed - Local extrema - Current Development - Conclusion 17

48 Connecting the dots Figure 12: Connected cell corners. We see some interesting results, but it is very complicated to extract cells from this data. Introduction - Watershed - Local extrema - Current Development - Conclusion 18

49 Latest development Figure 13: Located corners of an octagonal cell (as we have only allowed 8 points to move). Introduction - Watershed - Local extrema - Current Development - Conclusion 19

50 Conclusion Identification of the problem. Introduction - Watershed - Local extrema - Current Development - Conclusion 20

51 Conclusion Identification of the problem. Attempts at a simple solution don t work. Introduction - Watershed - Local extrema - Current Development - Conclusion 20

52 Conclusion Identification of the problem. Attempts at a simple solution don t work. Finding local extrema as a foundation. Introduction - Watershed - Local extrema - Current Development - Conclusion 20

53 Conclusion Identification of the problem. Attempts at a simple solution don t work. Finding local extrema as a foundation. Using a potential to form cells. Introduction - Watershed - Local extrema - Current Development - Conclusion 20

54 References I [1] P.J.W. Iles, Average Cell Orientation, Eccentricity and Size Estimated from Tissue Images, Master thesis, University of Waterloo, Waterloo, Ontario, Canada, (2005). [2] F. Liu, F. Xing & L. Yang, Robust Muscle Cell Segmentation using Region Selection with Dynamic Programming, Proceedings IEEE int. Symp. Biomed. Imag., pp. 521, April (2014). [3] P. Arbelez, M. Maire, C. Fowlkess & J. Malik, Contour Detection and Hierarchical Image Segmentation, IEEE transactions on pattern analysis and machine intelligence, vol. 33, no. 5, 898, (2011). [4] L. Najman & M. Schmitt, Geodesic Saliency of Watershed Contours and Hierarchical Segmentation, IEEE transactions on pattern analysis and machine intelligence, vol. 16, no. 12, 1163, (1996). Introduction - Watershed - Local extrema - Current Development - Conclusion 21

55 References II [5] K. de Clerk & T.S. Buys, Analytical efficiency in chromatography. I. Qualitative efficiency, Separation science, vol. 7, no. 4, pp , (1972). [6] R. Shinnar & G.H.Weiss, A note on the resolution of two Gaussian peaks, Separation science, vol. 11, no. 4, pp , (1976). Introduction - Watershed - Local extrema - Current Development - Conclusion 22

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