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Steve Eddins
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Publié le
Retirement!
The time has come! After more than 30 years of software development at MathWorks, I have decided to retire. Friday, March...
4 mois il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/collage-1200w-1024x625.jpg)
Publié le
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,...
environ un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/find_image_code_01.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/VideoAnalysisBlogPost_05.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/circularity_update_01.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/objects_touching_border_imclearborder_regionprops_01.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/bwlabel_bwconncomp_regionprops_order_05.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/fast_local_sums_01.png)
Publié le
Objects and Polygonal Boundaries
In some of my recent perusal of image processing questions on MATLAB Answers, I have come across several questions...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/objects_touching_polygon_02.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
Finding the Channels
Last winter, Aktham asked on MATLAB Answers how to find the channels in this image.url =...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/finding_channels_01.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
New Geometric Transformation Matrix Convention in R2022b
In the R2022b release, Image Processing Toolbox includes several new geometric transformation objects, such as rigidtform2d,...
plus d'un an il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/transposed_geometric_transformation_matrices_4.png)
Publié le
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...
plus d'un an il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
Double Thresholding
Back in June, my answer to a question on MATLAB Answers used a technique called double thresholding, also known as...
presque 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/double_thresholding_1.png)
Publié le
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...
presque 2 ans il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
Puzzle Pieces and Polyshapes
color segmentation, opening by reconstruction, boundary tracing, polyshapesEarlier this summer, Cleve sent me this picture...
presque 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/cheese_puzzle_polyshape_4.png)
Publié le
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...
environ 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/imsplit_post_1.png)
Publié le
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...
environ 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/find_all_highest_pixels_2.png)
Publié le
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...
environ 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/more_lab_color_gamut_stuff_1.png)
Publié le
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...
plus de 2 ans il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
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...
plus de 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/1611929796496-150x150.jpg)
Publié le
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...
plus de 2 ans il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
A Short Game of Life
I have written here, as well as in Digital Image Processing Using MATLAB, about using image processing operations to...
plus de 2 ans il y a
![Thumbnail](/matlabcentral/images/default_screenshot.jpg)
Publié le
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...
plus de 2 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/visualizing_out_of_gamut_lab_colors_01-3.png)
Publié le
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...
presque 3 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/locating_broad_peaks_1.png)
Publié le
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...
presque 3 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/explaining_hmax_1-2.png)
Publié le
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...
presque 3 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/local_max_regional_max_imregionalmax_1.png)
Publié le
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...
environ 3 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/using_meshgrid_repmat_less_1.png)
Publié le
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...
environ 3 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/tracing_george_updated_1.png)
Publié le
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...
environ 3 ans il y a
![Thumbnail](https://blogs.mathworks.com/steve/files/nan-metronome-139x300.png)