MATLAB - How can I crop some part of an image from .fig file and save it as .mat?

Question

I have a .fig file. I put the 32x32 square on the image where I want. I write this code:

h = imrect(gca,[1 1 32 32]);

However I don't crop 32x32 part of the image. How to crop and save as .mat from .fig?

Answer 1

You can use the getPosition property of imrect object. If you are working with a .fig file, you can initially use the getimage function to get the image from the Image handle.

%% If you are working with a image file.    
%Sample image.
%I = imread('cameraman.tif');

%Display image.
%imshow(I);

%% If you are working with a .fig file. 
%In the following example, yourfile.fig is cameraman.tif previously saved as a .fig file.
I = open('yourfile.fig')
I = getimage(I); 

%Draw rectangle.
h = imrect(gca,[100 30 40 32]);

%Crop rectangle.
J=imcrop(I,h.getPosition);

%Show rectangle.
imshow(J);

%Save as .mat file
save('mymatfile.mat','J');

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Initial image:

imrect object added:

Cropped element: