• Object Sort Order for bwlabel, bwconncomp, and regionprops

    Updated: 2023-01-30 21:28:11
    Someone recently asked me about the order of objects found by the functions bwlabel, bwconncomp, and regionprops. In this binary image, for example, what accounts for the object order?The functions... read more

  • Fast Local Sums, Integral Images, and Integral Box Filtering

    Updated: 2023-01-09 21:05:51
    In May 2006, I wrote about a technique for computing fast local sums of an image. Today, I want to update that post with additional information about integral image and integral box filtering... read more

  • Objects and Polygonal Boundaries

    Updated: 2022-12-28 21:12:17
    In some of my recent perusal of image processing questions on MATLAB Answers, I have come across several questions involving binary image objects and polygonal boundaries, like this.The questions... read more

  • Avoid Using JPEG for Image Analysis

    Updated: 2022-12-19 13:59:30
    Note added 20-Dec-2022: I wrote this post with lossy JPEG in mind. If you work with DICOM data, see Jeff Mather's note in the comments below about the use of lossless JPEG in DICOM. I have... read more

  • Finding the Channels

    Updated: 2022-12-12 18:35:07
    Last winter, Aktham asked on MATLAB Answers how to find the channels in this image.url = "https://www.mathworks.com/matlabcentral/answers/uploaded_files/880740/image.jpeg";A =... read more

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