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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Solved
Spherical radius given four points
Determine the radius of a sphere provided four non-coplanar points on the surface of the sphere. pts = [x1 y1 z1; x...
5 days ago
Solved
Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]
5 days ago
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...
5 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...
6 days ago | 0
| accepted
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...
6 days ago | 0
| accepted
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...
6 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...
6 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...
9 days ago | 0
Solved
Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...
9 days ago
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...
9 days ago | 0
Solved
Create a cell array out of a struct
Create a cell array out of a (single) struct with the fieldname in the first column and the value in the second column: in: ...
11 days ago
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...
11 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...
11 days ago | 0
| accepted
Submitted
IMVIEW Image Display Function
The MATLAB function imview displays binary, grayscale, and RGB images. It is intended to replace imshow in most cases.
7 months ago | 5 downloads |
Submitted
Pixel Grid
The MATLAB function pixelgrid shows the edges of image pixels.
7 months ago | 6 downloads |
Submitted
Image Zoom Level and Pan Utilities
Image zoom level and pan functions
7 months ago | 8 downloads |
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
| accepted
Submitted
FFT Transform Length
Computes optimized transform length for FFT computations
1 year ago | 1 download |
Submitted
Initialize a MATLAB Toolbox
Create a basic set of folders and files for a MATLAB toolbox
1 year ago | 3 downloads |
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
| accepted
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
Submitted
Color Tools for MATLAB
Color Tools for MATLAB is an experimental collection of MATLAB functions related to color science computation and visualization....
2 years ago | 14 downloads |
Submitted
Code Trace for MATLAB
Code traces for exploring and troubleshooting executing code
3 years ago | 1 download |
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
