Combine two images from two callbacks

Question

as hz am 26 Aug. 2014

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https://de.mathworks.com/matlabcentral/answers/152450-combine-two-images-from-two-callbacks

Beantwortet: Geoff Hayes am 26 Aug. 2014

Hi,

Based on another question ( https://www.mathworks.com/matlabcentral/answers/152309-store-a-labeled-image-to-be-called-later-by-a-callback ) I am trying to combine two images

One of the images is based on setappdata in a callback

setappdata(handles.imageAxes, 'IVariable', displayedImage.cdata);

and the other one is a handles.myImage , which is mainly a I = imread(fullFileName) in another callback.

The script below is not working and I think it is because of the cdata, how can I fix it?

Thanks a lot.

Script:

I = getappdata(handles.imageAxes , 'IVariable');
X = handles.myImage;
Icombine = [X I];
figure
imshow(Icombine);

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Geoff Hayes am 26 Aug. 2014

When you say it is not working, do you mean that there is an error message, and if so, what is it?

What are the dimensions of X and I?

as hz am 26 Aug. 2014

In MATLAB Online öffnen

They have different dimensions, an example:

cdata  370x555x3 uint8
I 735x1106x3 uint8

Errors are: Error using vertcat CAT arguments dimensions are not consistent.

Error in TRY4>combineButton_Callback (line 433) Icombine = [X I];

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Answer 1

Geoff Hayes am 26 Aug. 2014

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https://de.mathworks.com/matlabcentral/answers/152450-combine-two-images-from-two-callbacks#answer_149919

In MATLAB Online öffnen

Due to the different number of rows, the error message makes sense. Though I would have expected a

 Error using horzcat
 Dimensions of matrices being concatenated are not consistent.

if the line code is

Icombine = [X I];

The error message you posted (with vertcat) implies that you are combining the images one of above the other as

[X ; I]

So, if horizontal concatenation (first method), then the two images need to have the same number of rows. If vertical concatenation (second method) then the two images need to have the same number of columns. In order to get the same number of rows (or columns) then you can use imresize, if you have the Image Processing Toolbox.

Or, you can concatenate a portion of the larger image with the smaller one. For example,

Icombine = [X I(1:370,:,:)];

Though you will obviously lose some of the larger image in this combination.