Constantino Carlos Reyes-Aldasoro

City, University of London

Last seen: Today | Active 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 to use OpenCV imopen in Matlab?
Why don't you use matlab's native imopen function? https://uk.mathworks.com/help/images/ref/imopen.html

12 days ago | 0

Answered
Read the text files names are already in the table
If they are inside a folder, you could read the files in the folder and then loop over those files. If you have the names and ...

12 days ago | 0

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Answered
Converting binary to image file
You are mixing many things. If you use 'sobel' between single quotes you are using a string with the characters s o b e l. ...

15 days ago | 0

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Deep Network Designer with dicom images
DICOM is treated differently than normal images as you will have many fields related with the images (like patient data). Have y...

15 days ago | 0

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Answered
how to view 4D-single Image
Hello It depends very much what you want and where you data comes from. A 4D data set may be a 3D + time data set and thus you ...

1 month ago | 0

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Weird characters when editing figure
I would suggest that you do not edit the text of figures. The whole idea of using Matlab instead of photoshop/gimp/illustrator i...

1 month ago | 0

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Bar graph and "stacked" options.
This is solved easily by adding zeros in the columns that you do not want a stack, e.g. bar ( [1 2 3;0 2 3;0 0 6]','stacked')...

1 month ago | 1

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Answered
Loading multiple datafiles into MATLAB and plotting a colourmap
In Matlab, the command "colormap" corresponds to the color/colours that are assigned to the intensity of a figure. You display 2...

1 month ago | 0

Answered
Problem saving plot as jpg or pdf
You could try to add the legend outside the actual axes, e.g. 'eastoutside', have a look here: https://uk.mathworks.com/help/ma...

1 month ago | 1

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Answered
Grain Model how to remove smaller grains
Ok, I think now I understand your problem. I thought you had information on the grains themselves, but if you are starting with ...

2 months ago | 0

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Grain Model how to remove smaller grains
A bit difficult to help more without the data but I think that your problem can be fixed by selecting your grains by the propert...

2 months ago | 0

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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 months ago | 0

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Answered
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 months ago | 0

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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 ...

3 months ago | 0

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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 ...

3 months ago | 0

Answered
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...

3 months ago | 0

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Answered
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...

3 months ago | 0

Answered
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...

4 months ago | 0

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

4 months ago | 1

Answered
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.

5 months ago | 0

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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...

5 months ago | 0

Answered
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...

6 months ago | 1

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Answered
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...

6 months ago | 2

Answered
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...

7 months ago | 0

Answered
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...

7 months ago | 0

Answered
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 ...

8 months ago | 0

Answered
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...

8 months ago | 0

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Answered
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...

8 months ago | 0

Answered
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...

10 months ago | 1

Answered
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...

11 months ago | 1

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