Steve on Image Processing with MATLAB

Image processing concepts, algorithms, and MATLAB


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Retirement! 13

The time has come! After more than 30 years of software development at MathWorks, I have decided to retire. Friday, March 29, will be my last day. For 18 of those 30 years, I’ve been writing... read more >>

An Example of Function Argument Validation for an Image Utility Function 5

While I was working on a prototype yesterday, I found myself writing a small bit of code that turned out to be so useful, I wondered why I had never done it before. I'd like to show it to you.... read more >>

Quantitative Video Analysis: Measuring a Container Filling with Liquid

Today's post is by guest blogger Isaac Bruss. Isaac has been a course developer for MathWorks since 2019. His PhD is in computational physics from UMass Amherst. Isaac has helped launch and support... read more >>

Revised Circularity Measurement in regionprops (R2023a) 2

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 >>

Identifying Border-Touching Objects Using imclearborder or regionprops 2

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 >>

Object Sort Order for bwlabel, bwconncomp, and regionprops

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 7

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

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 8

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 3

Last winter, Aktham asked on MATLAB Answers how to find the channels in this image.url = "";A =... read more >>

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