Steve Eddins
Retired, MathWorks
Retired from MathWorks in 2024 after 30 years of service. Can now be found at MATLAB Central and steveeddins.com. MathWorks career included image processing, toolbox development, MATLAB development and design, development team management, MATLAB design standards, Steve on Image Processing blog (https://blogs.mathworks.com/steve). Co-author of Digital Image Processing Using MATLAB (https://www.imageprocessingplace.com/DIPUM-3E/dipum3e_main_page.htm). French horn enthusiast, member of Concord Orchestra and Melrose Symphony, member of the board of Cormont Music and the Kendall Betts Horn Camp
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How does the svd function determine or fix the phase of singular vectors?
For a discussion of how MATLAB computes the SVD, see Cleve Moler's blog post, "Two Flavors of SVD," 23-Feb-2025. The svd doc pa...
8 days ago | 1
Problem with image registration on images with simple patterns
As of R2024b, the function imregcorr uses a new algorithm called normalized gradient correlation. See my 16-Oct-2025 blog post f...
8 days ago | 0
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is there a bug in imregcorr-function for transformtype "rigid" ?
As of R2024b, the function imregcorr uses a new algorithm called normalized gradient correlation. See my 16-Oct-2025 blog post f...
8 days ago | 0
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Registering high resolution image with blurry image
As of R2024b, the function imregcorr uses a new algorithm called normalized gradient correlation. See my 16-Oct-2025 blog post f...
8 days ago | 0
imregcorr() misaligns images badly
As of R2024b, the function imregcorr uses a new algorithm called normalized gradient correlation. See my 16-Oct-2025 blog post f...
8 days ago | 1
Image registration with different x and y scales
I know I'm 5+ years late to this question, but I just now came across it while reviewing old questions about imregcorr. The tra...
11 days ago | 0
Specifying color as hex works for plot, but not for scatter
I believe this is a bug, and I recommend that you report it to MathWorks support. Perhaps it was an oversight from when hex colo...
12 days ago | 0
Weird LaTeX result of $\tilde{}$ in R2025b version.
It looks like graphics LaTeX renderer has changed. It is now producing something that looks similar to what is shown in the MATL...
14 days ago | 0
Mapping toolbox functions missing in installation
These functions are implemented as methods of certain classes, such as MapCellsReference or GeographicCellsReference. As methods...
14 days ago | 0
| accepted
Question
Where is the programmable setting corresponding to the Live Editor default view?
The settings UI panel for MATLAB -> Editor/Debugger -> Display includes this control: Where can I find the corresponding pr...
8 months ago | 1 answer | 2
1
answerAre there any faster alternatives to readlines?
Try this: Read the file using fileread. Convert to string. Call split. Using Walter's idea for a sample text file: filename...
9 months ago | 1
| accepted
Vertical blank space in tiledlayout compact
Trying setting TileSpacing to compact or tight. t=tiledlayout(2,2,'Padding','compact','TileSpacing','compact'); Or: t=tiledla...
1 year ago | 1
What is the Image Processing Toolbox Convention for Input to freqz2() ?
The convention for Image Processing Toolbox filter design functions is for the filter to be specified as a correlation kernel. T...
1 year ago | 1
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Axes in dialog box turn blank after calling imagesc in pushbutton callback
This is a strange one. The primary trigger for the unusual behavior is that the dialog function creates a figure with an empty c...
2 years ago | 2
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How to measure the correct circularity??
R2023a Update: Correcting regionprops Circularity Measurements That Are Greater Than 1.0 Image Processing Toolbox R2023a or Lat...
2 years ago | 1
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...
2 years ago | 3
regionprops circularity value >1 and 0 ?
R2023a Update: Correcting regionprops Circularity Measurements That Are Greater Than 1.0 Image Processing Toolbox R2023a or Lat...
2 years ago | 2
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...
3 years ago | 0
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...
3 years ago | 4
| accepted
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.
3 years ago | 0
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...
3 years ago | 0
How can I change a square wave into a sign wave with the graph provided?
Try removing the call to the sign function.
3 years ago | 0
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...
3 years ago | 1
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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...
3 years ago | 1
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Saving to .mat without additional struct.
Try this: s = load("test2.mat"); aircraftdata = s.test;
3 years ago | 1
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...
3 years ago | 0
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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...
3 years ago | 0
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...
3 years ago | 0
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Is this another bug in imread(), or is this just a forum problem?
I can reproduce the problem in MATLAB Answers. The problem does not occur in MATLAB Online or in the desktop version. I'll let ...
3 years ago | 0
How to use "imregister" with "InitialTransformation"?
The value of InitialTransformation is supposed to be an affine3d object, not an imref3d object. See the doc description for the ...
3 years ago | 1
| accepted
