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Constantino Carlos Reyes-Aldasoro


Last seen: 7 days ago

City, University of London

92 total contributions since 2016

Senior Lecturer in Biomedical Image Analysis at City, University of London. Huge Matlab fan, wrote the book "Biomedical Image Analysis Recipes in MATLAB: For Life Scientists and Engineers" published by Wiley-Blackwell.

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Answered
How can I extract features about image texture?
Hello The basic concept of texture is that you will transform your image, which has a certain texture, to a different space, wh...

21 days ago | 0

Answered
what is a method for segmentation texture?
Hello The basic concept of texture is that you will transform your image, which has a certain texture, to a different space, wh...

21 days ago | 0

Answered
Create empty rows in a cell, based in a condition
Hello I do not know why there should be rows that are skipped, unless you are copying and pasting and something goes wrong. I h...

21 days ago | 0

Answered
Reference to non-existent field 'a'.
This error is arising from trying to read a field from a structure, when the field is not existing for example >> example.a = 1...

24 days ago | 0

Answered
How to perform morphological reconstruction by dilation?
Dilation is rather simple, but perhaps there are more steps to what you want: f9_dil = imdilate(f9,strel('diamond',3));

1 month ago | 0

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How to perform morphological reconstruction by dilation?
Dear Krishna I have seen several of your questions, I think that you would greatly benefit if you would study some Matlab and...

1 month ago | 0

Answered
How to extract features from candidates?
First you need to label your objects with bwlabel, e.g. labelled_image = bwlabel (original_image); that will return your same ...

1 month ago | 0

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Answered
finding length of scale bar from matrix form of image
As said before, not too difficult if you know what you need. Here is the code % Read the image imageWithScaleBar = imread('/...

2 months ago | 0

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Answered
finding length of scale bar from matrix form of image
This should be easy by thresholding for the levels expected (black will be low in the three RGB channels, but not necessarily 0)...

2 months ago | 0

Answered
unsers texture feature extraction
I would suggest that before using Unser's techniques (Where Unser is a person, Michael Unser http://bigwww.epfl.ch/unser/) try c...

2 months ago | 0

Answered
How to get the hue/saturation of a colourful images?
If you want hue and saturation, then what you need is to transform from RGB to HSV, try rgb2hsv.

2 months ago | 0

Answered
Matlab returns incorrect figure size when using figure with custom toolbar
I would support the idea of doing this through code. What you also do is once you have generated the GUI, grab the handles of th...

2 months ago | 0

Answered
Problem finding the index?
Hello, you have a very subtle problem, and it is that you do not have a value of 40 in your matrix. If you see the value of loca...

3 months ago | 0

Answered
Problem finding the index?
Ok, a problem of precision, I will edit the previous answer to have the complete solution

3 months ago | 1

Answered
How to display UNICODE/IPA characters within GUIs and plots?
Hello. This may seem rather simple but it *works*, you can just copy-paste the symbols from a webpage, for instance https://e...

3 months ago | 0

Answered
Extract specific row from an image and average with a variable number of adjacent rows
Certainly it can be done much easier. Instead of this yth_row=(img(xcol,:)+img(xcol-1,:)+img(xcol+1,:)+img(xcol-2,:)+img(xcol+...

3 months ago | 0

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Answered
how to trace black and white region separately in an binary image
generate 2 images, one at which you threshold for bright values, and one for which you threshold for dark values. Once you have ...

3 months ago | 0

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Answered
How to detect start points and end points of plateaus in graph plotted from a data set?
There are some uncertainties in your problem: How noisy is the data? Is there variation of intensity within the plateau? Do ...

3 months ago | 0

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Answered
video convert to PNG but black and white
It may be an issue with data types like double, uint8, etc. Instead of imshow try imagesc and also try imshow(A/max(A(:))); ...

3 months ago | 0

Answered
PROBLEM IN PLOTTING THE FOURIER SEIRES
The problem you are facing is that your calculations are generating NaNs: >> zt zt = Columns 1 through 3 NaN...

3 months ago | 0

Answered
Segmentation shoulder X-ray image
Ok, here is the solution, following the ideas I had previously described. I downloaded your edges so it may not be exaclty the s...

3 months ago | 1

Answered
calculate volume under of 3D isosurface plot
What isosurface and isovalue are doing are generating a surface around those points that are above a certain value. All code you...

3 months ago | 0

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Answered
Counting wheat plants in a photo
It is not clear what you have already done to reach the b/w images, what I would do as first steps would be 1) exploit the fact...

3 months ago | 0

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Answered
Segmentation shoulder X-ray image
Ok, this is a good start, try the following, assuming that your image is a b = edge(a,'Canny',[],3); So what you showed wa...

3 months ago | 0

Answered
Empty variables and vectors
I think we need a bit more information to fully understand each other, but let's see if this helps you have three variables a,b...

3 months ago | 0

Answered
FFT of sine wave not plotting
In addition to the previous comment 2 issues: 1) FFT will give a complex answer so you will need to plot the absolute values ...

3 months ago | 0

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Segmentation shoulder X-ray image
Not trivial as the intensity is high on the top and right side of the image. Otherwise a thresholding after low pass filtering c...

3 months ago | 0

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how to get lowest row number in matrix?
use min https://uk.mathworks.com/help/matlab/ref/min.html

3 months ago | 0

Answered
Empty variables and vectors
yes, it is easy declare the variables as empty: a =[]; b=[]; c = []; then run the rest of the code and when you reach you...

3 months ago | 0

Answered
Get the first file in each folder
Use the command "dir" and do it in loops: dir0 = dir('firstFolder'); numEntries = size(dir0,1) Then loop: for k=1:numE...

3 months ago | 0

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