• Isotropic dilation using the distance transform

    Updated: 2010-08-16 18:10:54
    Brett recently asked me about an image processing problem. One step in the problem involved finding out which pixels are within a certain distance of the foreground in a binary image. We experimented with a few methods, and I want to share the results [...]

  • Visualizing regionprops ellipse measurements

    Updated: 2010-07-30 01:47:39
    The Image Processing Toolbox function regionprops gives you measurements of shape-based measurements of image regions. It's pretty useful, and I have shown many examples of it on this blog. Today I want to show you how to visualize the ellipse-based measurements produced by regionprops. [...]

  • Complex surprises from fft

    Updated: 2010-07-16 19:20:22
    One of the discrete-time Fourier transform properties that many people learn is that if a sequence is conjugate symmetric, , then the Fourier transform is real. Therefore it surprises people sometimes when the output of fft is unexpectedly complex. For example: [...]

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