Steve Eddins

Last seen: Today | Active since 2006

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Answered
How to measure the correct circularity??
R2023a Update: Correcting regionprops Circularity Measurements That Are Greater Than 1.0 Image Processing Toolbox R2023a or Lat...

1 day ago | 0

Answered
How to detect circularity more accurately than 4*pi*A/P^2?
R2023a Update: Correcting regionprops Circularity Measurements That Are Greater Than 1.0 Image Processing Toolbox R2023a or Lat...

1 day ago | 2

Answered
regionprops circularity value >1 and 0 ?
R2023a Update: Correcting regionprops Circularity Measurements That Are Greater Than 1.0 Image Processing Toolbox R2023a or Lat...

1 day ago | 2

Published

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...

2 months ago

Submitted

Color Tools for MATLAB
Color Tools for MATLAB is an experimental collection of MATLAB functions related to color science computation and visualization....

2 months ago | 20 downloads |

Published

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...

2 months ago

Published

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

3 months ago

Published

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...

3 months ago

Published

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

3 months ago

Published

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...

4 months ago

Published

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

5 months ago

Published

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...

5 months ago

Submitted

Code Trace for MATLAB
Code traces for exploring and troubleshooting executing code

5 months ago | 4 downloads |

Answered
What is the easiest way to plot a circle annotation that maintains its shape regardless of figure dimensions?
You can position a circle with the center specified in axes data space by plotting a single point using a circle marker. You can...

5 months ago | 0

Answered
Saving figure in jpg with 600 dpi
The function exportgraphics generates and saves the image at the specified resolution, but it does not write resolution info int...

5 months ago | 3

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Published

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

5 months ago

Answered
How to remove thin lines from the following image?
Try using the 3rd output of imfindcircles (metric) to distinguish the bigger droplets that aren't really circles.

6 months ago | 0

Published

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...

6 months ago

Published

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

6 months ago

Answered
Convert RAW file (NEF) to CIELab
You could use the Image Processing Toolbox function raw2rgb to convert your raw NEF to sRGB values, and then you could use the r...

6 months ago | 0

Answered
How can I change a square wave into a sign wave with the graph provided?
Try removing the call to the sign function.

6 months ago | 0

Answered
label two objects that share part of the same boundary separately
m = [0,1,1,1,0;1,0,0,0,1;0,1,1,1,0;0,1,0,1,0;0,0,1,0,0] Fill the holes. From your example, it looks like the background connect...

8 months ago | 1

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Published

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...

8 months ago

Answered
Extracting bright spots on image
Try something like the following: Convert to grayscale (using rgb2gray). Use imextendedmax to pick out the bright peaks. You'l...

9 months ago | 1

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Answered
Saving to .mat without additional struct.
Try this: s = load("test2.mat"); aircraftdata = s.test;

9 months ago | 1

Published

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...

10 months ago

Answered
Find consecutive numbers below threshold using bwlabel
You could a hysteresis thresholding technique. First, threshold with a strict threshold, like your 0.5. Then, threshold with a s...

10 months ago | 0

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Answered
3D Plot shrinks one dimension when plotting Alphashape
The plot method for alphaShapes sets the data aspect ratio to [1 1 1]. When your code arrives at line 76, the data aspect ratio...

10 months ago | 0

Answered
Use Geographic Plots in tiledlayout without multiple axis
From the doc for nexttile: "nexttile creates an axes object and places it into the next empty tile of the tiled chart layout tha...

11 months ago | 0

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Published

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...

11 months ago

Steve Eddins

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