Community Profile

# Constantino Carlos Reyes-Aldasoro

### City, University of London

100 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.

View details...

Contributions in
View by

Segmentatio of ecg signal
Hello As mentioned previously, it is not possible to answer without more knowledge of the case itself. But I can point you to t...

14 dagar ago | 0

Fixing the appropriate threshold level to binarize a droplet image where the droplet area is found to vary with the threshold
Dear Anjan There is no exact way to decide the threshold. To illustrate this, I have taken a profile line to illustrate the i...

14 dagar ago | 0

How can I change data directly from the plot ?
To complement what Mehmed has just posted. It would be even easier if when you first create your figure, you save in handles all...

14 dagar ago | 2

How can i find the fundamental frequency of the signal using the autocorrelation function?
Have you considered using the Fourier Transform to convert from time domain to Frequency domain? There you can find the highest ...

21 dagar ago | 0

Not enough input arguments. Help?
Your problem may be that you are calling your function without the required input parameters your function requires one paramete...

ungefär 2 månader ago | 0

Why am I getting Nan values?
Hello There are several issues, but primarily about the way you use your code. 1) The code as it is is very long and convol...

ungefär 2 månader ago | 0

Need help with string counting
Perhaps the error is here: if strfind(str,'A') dydis = dydis + length(A); end You are detecting...

Doubt in MATLAB coding.
This is a bit hard to solve without knowing more of the problem. What I would do is to break down the problem and analyse each s...

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...

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...

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...

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...

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));

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...

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 ...

| accepted

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('/...

| accepted

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)...

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...

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.

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...

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...

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

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...

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+...

| accepted

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 ...

| accepted

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 ...

| accepted

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(:))); ...

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...

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...