MATLAB: Step-back button in GUI

Question

Hello. I have a GUI with an image processing functions. My question is, is it possible to do Back button in this gui? I store and update all events in handles. e.g. handles.inputImage = handles.inputImage_gray, handles.inputImage = handles.inputImage_poisson_noise, handles.inputImage = handles.inputImage_gaussian_filter … The result is grayscale image with Poisson noise which is filtered by Gaussian Filter… And what if i want to do step back button and remove last event (in this case handles.inputImage = handles.inputImage_gaussian_filter ) and then next and then next last event. Is it possible to store handles in listbox and find last value and then assing to this value inverted state? handles.inputImage_poisson_noise = handles.inputImage. I hope u can understand what i want to do. Thank you very much.

Answer 1

After the colors have been converted to gray, there is no way to get the colors back. But of course you can store the initial value (image) in a list to which you append the new image after each operation. Then an undo is easy to implement.

% After loading the image
handles.imageList = {imageRGB};
handles.operation = {'original'};
...
% At applying any operation:
image = rgb2gray(image);
handles.imageList{end+1} = image;
handles.operation{end+1} = {'RGB to gray'};

Now an "undo" is:

if numel(handles.imageList) > 1
  image = handles.imageList{end-1};
end

and updating the display, maybe removing the last element from the lists, except you want t "redo".