how to reduce the pixel size of two image?

i am doing 2d to 3d imaging project here i am using two images left and right so 1st i want reduce the two images in equal size 0r compress the two images eg the 2 images are 64cross64 means i want to reduce the images as 4cross 4 or 16cross16 by using block matrix so please help me for that one

Answer 1

[Image Analyst]

Have you looked at imresize() or the FAQ : http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F