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Steve Eddins

Last seen: 4 months ago Active since 2006

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Retirement!
The time has come! After more than 30 years of software development at MathWorks, I have decided to retire. Friday, March...

4 months ago

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An Example of Function Argument Validation for an Image Utility Function
While I was working on a prototype yesterday, I found myself writing a small bit of code that turned out to be so useful,...

1 year ago

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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...

1 year ago

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Revised Circularity Measurement in regionprops (R2023a)
For some shapes, especially ones with a small number of pixels, a commonly-used method for computing circularity often...

1 year ago

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Identifying Border-Touching Objects Using imclearborder or regionprops
I have seen some requests and questions related to identifying objects in a binary image that are touching the image...

1 year ago

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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...

1 year ago

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Fast Local Sums, Integral Images, and Integral Box Filtering
In May 2006, I wrote about a technique for computing fast local sums of an image. Today, I want to update that post with...

1 year ago

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Objects and Polygonal Boundaries
In some of my recent perusal of image processing questions on MATLAB Answers, I have come across several questions...

1 year ago

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Avoid Using JPEG for Image Analysis
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...

1 year ago

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Finding the Channels
Last winter, Aktham asked on MATLAB Answers how to find the channels in this image.url =...

1 year ago

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Using Active Contour Automation in the Medical Image Labeler
Woo hoo! The Image Processing Toolbox team has just created a new product:Medical Imaging Toolbox™Shipped with the R2022b...

1 year ago

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New Geometric Transformation Matrix Convention in R2022b
In the R2022b release, Image Processing Toolbox includes several new geometric transformation objects, such as rigidtform2d,...

1 year ago

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Update for Code Trace for MATLAB
About a month ago, I posted about my Code Trace for MATLAB tool, which is posted to GitHub and the File Exchange. This tool...

1 year ago

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Double Thresholding
Back in June, my answer to a question on MATLAB Answers used a technique called double thresholding, also known as...

1 year ago

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Code Trace for MATLAB
Today's post departs from image processing, my usual subject. Instead, I want to tell you about something that I just put up...

2 years ago

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Puzzle Pieces and Polyshapes
color segmentation, opening by reconstruction, boundary tracing, polyshapesEarlier this summer, Cleve sent me this picture...

2 years ago

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How to use IMSPLIT to split a color image into component images
Today I want to show you a handy little function, imsplit, for splitting color images into their components.Also, for no...

2 years ago

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Find all the highest pixel values using ismember
Today's post shows how to use ismember to conveniently locate all of the highest pixel values in an image. For example, in...

2 years ago

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More experiments with sRGB gamut boundary in L*a*b* space
I'm still playing around with RGB gamut calculations in $ L^* a^* b^* $ space. (See my last post on this topic, "Visualizing...

2 years ago

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Puzzles About GIF DelayTime
[TLDR: To create a fast GIF animation using imwrite, use a DelayTime of 0.02 instead of 0.]In my 28-Feb-2022 post, I showed...

2 years ago

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Loren Shure and the Art (and History) of MATLAB
The one and only Loren Shure has just announced her retirement from MathWorks. I met Loren in early 1993 at the...

2 years ago

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R2022a
It's March, and you know what that means --- that's right, the "a" release is here!On most work days, I use several...

2 years ago

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A Short Game of Life
I have written here, as well as in Digital Image Processing Using MATLAB, about using image processing operations to...

2 years ago

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Visualizing out-of-gamut colors in a Lab curve
I was looking today at an old post, "A Lab-based uniform color scale" (09-May-2006). I wanted to provide an update to...

2 years ago

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Peaks, Peak Filtering, and Gray-Scale Weighted Centroids
Today, I'm continuing my recent theme of thinking about peak-finding in images. When I wrote the first one (19-Aug-2021), I...

3 years ago

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Small-Peak Suppression with the H-Maxima Transform
Last time, I introduced the idea of a regional maximum. Today, I want to add a concept that makes the regional maximum more...

3 years ago

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Local maxima, regional maxima, and the function imregionalmax
A recent algorithm discussion on the Image Processing Toolbox development team reminded me of something I originally wanted...

3 years ago

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Use less meshgrid and repmat
The functions meshgrid and repmat have a long and rich history in MATLAB. Today, I'll try to convince you to use them...

3 years ago

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Use imbinarize to Threshold Gray-Scale Images
Today, I want to convince you to use imbinarize instead of im2bw.Background: I recently saw some data suggesting that many...

3 years ago

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NaN Sightings
Some of us at MathWorks like to share our "NaN sightings." Here is an example to show what I mean. This is a screenshot of...

3 years ago

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