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...

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...

1 year ago | 0

| accepted

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...

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...

1 year 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...

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...

1 year ago | 0

| accepted

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...

1 year ago

Answered

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 ...

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 ...

1 year ago | 0

Answered

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 ...

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 ...

1 year ago | 1

| accepted

Published

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...

1 year ago

Published

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...

1 year ago

Published

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...

1 year ago

Answered

WebREAD returns zeors when reading a GIF image

I got an array of zeros once using your code, but later I ran it again and got the expected image data. I quit MATLAB and launch...

WebREAD returns zeors when reading a GIF image

I got an array of zeros once using your code, but later I ran it again and got the expected image data. I quit MATLAB and launch...

1 year ago | 0

| accepted

Answered

imwarp function - bands during interpolation

First, let me run Arnaud's reproduction code and display the result so that everyone can see what we are talking about. Im1 = r...

imwarp function - bands during interpolation

First, let me run Arnaud's reproduction code and display the result so that everyone can see what we are talking about. Im1 = r...

1 year ago | 1

| accepted

Published

A Short Game of Life

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

1 year ago

Answered

Check for missing argument or incorrect argument data type in call to function 'head' - using Matlab R2020a

The function head is only defined for an input that is a table, a timetable, or a tall array. When trying to execute your code,...

Check for missing argument or incorrect argument data type in call to function 'head' - using Matlab R2020a

The function head is only defined for an input that is a table, a timetable, or a tall array. When trying to execute your code,...

1 year ago | 1

| accepted

Answered

Getting imaginary numbers for induction factors; I am getting imaginary number for my induction fact Aa and At but I am not using any sqrt to calculte. Thank you.

The acos function returns complex values if the inputs are outside the interval [-1,1]. Set a breakpoint on the line where you a...

Getting imaginary numbers for induction factors; I am getting imaginary number for my induction fact Aa and At but I am not using any sqrt to calculte. Thank you.

The acos function returns complex values if the inputs are outside the interval [-1,1]. Set a breakpoint on the line where you a...

1 year ago | 0

Answered

Filling one type of holes in a binary image

Based on your description of what you're trying to do, I ask the question: how are the semi-rectangular grains, which you want t...

Filling one type of holes in a binary image

Based on your description of what you're trying to do, I ask the question: how are the semi-rectangular grains, which you want t...

1 year ago | 1

| accepted

Answered

How to remove extrapolated regions of a grid created with scatteredInterpolant?

You could try using an alpha shape to postprocess (mask) Z. Original code dx = 5; %grid step load('datapoints.mat'); F = s...

How to remove extrapolated regions of a grid created with scatteredInterpolant?

You could try using an alpha shape to postprocess (mask) Z. Original code dx = 5; %grid step load('datapoints.mat'); F = s...

1 year ago | 1

| accepted

Answered

How to create a filling/shading between prediction bounds?

I can't completely run your code (s and Asiiimodel are missing), but I think that the black color in your patch result is from t...

How to create a filling/shading between prediction bounds?

I can't completely run your code (s and Asiiimodel are missing), but I think that the black color in your patch result is from t...

1 year ago | 1

| accepted

Answered

FFT function is not functioning.

It seems that you may have tried to install MATLAB on a cloud drive (OneDrive). Or maybe you copied the application files into O...

FFT function is not functioning.

It seems that you may have tried to install MATLAB on a cloud drive (OneDrive). Or maybe you copied the application files into O...

1 year ago | 0

Answered

How do I transform this format 202007011030 (2020 07 01 10:30) into a readabel format?

I can imagine several ways to do this. Here is one. lines = readlines("Fehmarn_Wind_date.txt"); readlines was introduced in R2...

How do I transform this format 202007011030 (2020 07 01 10:30) into a readabel format?

I can imagine several ways to do this. Here is one. lines = readlines("Fehmarn_Wind_date.txt"); readlines was introduced in R2...

1 year ago | 0

Answered

ROI Trace boundaries result

I think some careful coordinate system tweaks will get you there. In many Image Processing Toolbox functions, pixels are treated...

ROI Trace boundaries result

I think some careful coordinate system tweaks will get you there. In many Image Processing Toolbox functions, pixels are treated...

1 year ago | 2

Answered

How is the 2D filter function used in this code?

For each element in A, filter2 essentially "slides" the filter F so that its center lines up with the element in A, and then it ...

How is the 2D filter function used in this code?

For each element in A, filter2 essentially "slides" the filter F so that its center lines up with the element in A, and then it ...

1 year ago | 1

| accepted

Answered

Changing color of pixels around certain pixels

Suppose mask is a logical matrix that indicates which pixels satisfy your condition. (That seems to be the purpose of idx in you...

Changing color of pixels around certain pixels

Suppose mask is a logical matrix that indicates which pixels satisfy your condition. (That seems to be the purpose of idx in you...

1 year ago | 2

| accepted

Answered

Colorbar range inconsistent in high aspect ratio images

Call axis image before you create the colorbar and set its tick labels. When you set tick labels manually, a mode is set so that...

Colorbar range inconsistent in high aspect ratio images

Call axis image before you create the colorbar and set its tick labels. When you set tick labels manually, a mode is set so that...

1 year ago | 0

| accepted

Published

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...

1 year ago

Published

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...

1 year ago

Published

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...

1 year ago

Published

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...

2 years ago

Answered

Can a MATLAB function edit the input?

You'll need your class to subclass handle. See the documentation page "Implementing Linked Lists with Classes" for details.

Can a MATLAB function edit the input?

You'll need your class to subclass handle. See the documentation page "Implementing Linked Lists with Classes" for details.

2 years ago | 0

| accepted

Published

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...

2 years ago

Answered

Matlab working very slow on my m1 MacBook Pro

See this answer and follow it for updates related to this problem.

Matlab working very slow on my m1 MacBook Pro

See this answer and follow it for updates related to this problem.

2 years ago | 2