# 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**

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...

12 giorni ago | 0

| accepted

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...

12 giorni 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...

13 giorni 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 ...

13 giorni 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.

circa 2 mesi 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...

2 mesi 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 mesi 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 mesi 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...

4 mesi 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...

4 mesi 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 ...

5 mesi 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...

5 mesi 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...

5 mesi 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...

6 mesi 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...

7 mesi 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...

8 mesi ago | 0

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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...

8 mesi ago | 1

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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?

9 mesi 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'); ...

9 mesi 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 mesi 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 mesi 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 mesi 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...

10 mesi 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?

10 mesi 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 mesi ago | 0

How to Loop to plot histogram and line plot?

The following is not clear and most probably your error: for i=4:8;k=1:2 subplot(1,2,k) plot(Temp(:,3),Temp(:...

12 mesi ago | 0

fprintf or fwrite non ASCII characters

Have you tried using TeX formatting? I.e. \alpha \sigma \mu https://uk.mathworks.com/help/matlab/creating_plots/greek-letters...

12 mesi ago | 0

Labelling of x axis

There are 2 ways to solve this: First is to plot in the actual hours instead of the points of the matrix that is holding th...

12 mesi ago | 0

| accepted

how to change the plot background?

Most probably the first figure you are showing is and RGB (type "whos" and look for the dimensions it should be rows x columns x...

circa un anno ago | 0