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Using Matlab: You might try converting your image to greyscale first with greycells = rgb2gray(rgbcells); where rgbcells contains the color image of your cells (see here). Then use Otsu's threshold on the greyscale image like so threshcells = graythresh(greycells); like so (see here). EDIT After OP explained what image should be the resulting image. ...


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If you remap a local patch around a feature point to log–polar coordinates (with the origin in the point of interest), scale changes correspond to a translation along the log–radial axis, while rotations correspond to translations (with wrap-around) along the angular axis. If you then calculate the two-dimensional Fourier transform, translations in the ...


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