how can i make use of sliding window to separate r,g,b channels?

good day all I am working on optic disc localization,i wanted to know ,how to implement sliding window technique using [80 80] pixels over an retinal image and with every moving window i would separate the r,g,b channels and obtain histogram of each channel

Answer 1

[Image Analyst]

See the FAQ : http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

Another snippet which may be useful for you:

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);

[vidya]

thank you sir... can i use blkproc function ??