Detect a keystroke in matlab while viewing a figure?

I'm trying to sort through some image data in matlab and want to prompt the user for input about a series of images. Each time I show an image I want to pause and wait for a keystroke and perform a different action depending on what was pressed.

Current Best Solution:

responses = zeros(length(image开发者_开发问答s),1);
for i = 1:length(images)
    im = imread(images{i}.fname);
    h = figure(1);
    imshow(im);

    % instead of just pause, I want to get the keystroke (k) that was pressed
    waitforbuttonpress;
    k = get(h,'CurrentCharacter');

    switch lower(k)
        case 'a'
            responses(i) = 1;
        case 'b'
            responses(i) = 2;
    end

end

You could use the KeyPressFcn property of the figure environment which should be set to a handle of a callback function that receives an event structure containing the character pressed. See the Matlab documentation for details and example.

Also you can look at the CurrentKey property of the figure environment but it will not give you a way to know when the key is actually pressed.