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Brightness variation between cameras

Hello all,

I have written a program that will take three video inputs (from an array of webcams) and "stitch" the corresponding images together, as shown here: http://i1276.photobucket.com/albums/y475/sesj13/Panorama2_zps3a060d17.jpg

Even though the seams have been blended together there is still a noticeable step in gain between each camera. I am wondering if there is a way to adjust the brightness of the two side images to be the same brightness as that of the middle image? I'm really not too sure and if anyone can point me in the right direction it would be much appreciated. :)