For some shapes, especially ones with a small number of pixels, a commonly-used method for computing circularity often results in a value which is biased high, and which can be greater than 1. In... read more >>

I have seen some requests and questions related to identifying objects in a binary image that are touching the image border. Sometimes the question relates to the use of imclearborder, and... read more >>

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 >>

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 >>

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 >>

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 >>

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 >>

Woo hoo! The Image Processing Toolbox team has just created a new product:Medical Imaging Toolbox™Shipped with the R2022b release a couple of months ago, this product provides apps, functions,... read more >>

In the R2022b release, Image Processing Toolbox includes several new geometric transformation objects, such as rigidtform2d, affinetform3d, etc., that use the premultiply matrix convention instead of... read more >>

About a month ago, I posted about my Code Trace for MATLAB tool, which is posted to GitHub and the File Exchange. This tool is useful for exploring and troubleshooting executing MATLAB code. I... read more >>