# Constantino Carlos Reyes-Aldasoro

### City, University of London

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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**Content Feed**

how to find index in matrix and average data ?

You can try the following, instead of "finding" the locations, which will be the indices, just use the locations like this: sst...

3 Tage ago | 0

| accepted

How to make a loop inside a loop?

Difficult to answer without more context, but I suspect that the error is not related to the loops but something else. There are...

3 Tage ago | 0

Hough transform incorrectly identifying vertical line segments

Ok, 2 things, you are first comparing and then subtracting, which may be counteracting, you could calculate hough directly like ...

10 Tage ago | 0

Hough transform incorrectly identifying vertical line segments

Have you tried inverting the intensities of the image? As it is, white is the main element and that will be difficult to obtain ...

10 Tage ago | 0

Why are title and label not working on histogram?

You are using the commands incorrectly, by writing title = ('Temperatures @ Top') you are creating a new variable called title w...

22 Tage ago | 0

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Change variable name in plot

As mentioned before, this is not the best way to handle your data, BUT you are where you are, so to be able to use the names run...

22 Tage ago | 0

2D color map change the input of y axis

Hello There are 2 ways to change the values of the y axis, first is to change the values when you plot. I do not have your fi...

24 Tage ago | 0

| accepted

Asignar matriz automaticamente.

Hola Primero te recomendaria escribir en ingles para aumentar la posibilidad de que respondan las preguntas. Segundo, para que ...

24 Tage ago | 1

Filter out small dust in image!

Where exactly are the rocks that you want to count? There is a lot of green but I cannot immediately see any rocks.

etwa 2 Monate ago | 0

Bar Plot Legend and Axes

Hi First, to plot the subplots together, you need to grab the handles of each axes, i.e. figure h1=subplot(141); h2=subplo...

3 Monate ago | 0

Smoothing colormap of plotted image

If you only want to smooth the final data, you can try with filters, e.g. imagesc(medfilt2(abs(Y),[5 5 ])) imagesc(imfilt...

3 Monate ago | 1

| accepted

How to calculate the centroid / center of a patch?

The data X,Y must have been previously calculated from some raw data, say a thresholded figure, it is from that data you can eas...

3 Monate ago | 2

Error of the following code : "Array indices must be positive integers or logical values."

Not very clear, what are length_ijk and index_ijk? in the files you have added, miu has 262144 values, ind has 77 and freq has 6...

5 Monate ago | 0

Not able to write the image by reading xcel files generated , getting error of data type as shown in picture attached. Anybody please help.

This is not very clear, it would be better to copy the code instead of figures and provide a sample file so that the case can be...

5 Monate ago | 0

How to add colormap on an image?

I guess that this is a 2 step question, you want to add a colormap and then export as a png or jpeg, try the following, read an ...

6 Monate ago | 0

What is a good performance metric for pixels classification tasks

One good metric is the Jaccard Index, or the Intersection over Union. What this metric does is to divide true positives over th...

6 Monate ago | 0

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Does anyone know how to create graphics of the same size?

Hello You can use the command "print" https://uk.mathworks.com/help/matlab/ref/print.html?searchHighlight=print&s_tid=srcht...

6 Monate ago | 0

double data type in image processing

Another easy way around this is to divide the doubles by 255 X=imread('cameraman.tif'); %read the cameraman image X=doubl...

7 Monate ago | 1

Random shuffle of vector elements

This can be easily done by addressing the vector correctly. First you need a random order to shuffle your elements. You can do t...

8 Monate ago | 1

| accepted

how can i use a Gaussian gradient routine for remove the out of focused section in image processing

You could refine your processing using bwlabel to assign unique labels to the regions you have already detected. Then use region...

9 Monate ago | 0

| accepted

A ’BGR’ image.

Hello: First, changing channels is very simple you just need to change the third dimension of the image, e.g. image1=imread('p...

9 Monate ago | 1

| accepted

I cannot save matlab editor, the .m file.

I guess that you must have used some special characters like accents, have you copy-pasted something into the editor?

10 Monate ago | 0

Detecting a stain in a texture

This would not be that difficult, marble = imread('https://upload.wikimedia.org/wikipedia/commons/f/f3/SierraXenolith.JPG'); ...

10 Monate ago | 0

I need to find the phase of the images.

Hello The image that you show could be that of a phase, but it is hard to judge from what you are showing. In any case, here is...

10 Monate ago | 3

unshow unnecessary intervalls in a histogramm

Hello: What you need to do is rather simple if you capture the values of your histogram, instead of using hist to display dir...

10 Monate ago | 0

Mean computaion in matlab

If your data is in a matrix of dimensions [samples x 3], e.g. data=[lon1 lat1 value1; lon2 lat2 value2; lon3 lat3 value3; ...

10 Monate ago | 0

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convolution of 2 signals

You are confusing functions. conv is used to obtain the convolution, subplot is used to divide a figure and then plot inside eac...

11 Monate ago | 0

Compute convolution y[n]=x[n]*h[n]: x[n]={2,0,1,-1,3}; h[n]={1,2,0,1}

What exactly is your question?

11 Monate ago | 0

How can I extract the GLCM features from each nucleus of mircroscope blood smear image?

One way to do this would be to crop each region, once you have found each object, you can use regionprops to determine the extre...

11 Monate ago | 0