image recoqnition

[jamesoc]

i am working on an image recoqnition program and so far i have managed to get the program to convert an image to black and white and now i have the program giving me the color of the coordinates if i move the mouse over the image in a picture box. what i want though is the image to be scanned automatically ie when i hit a command button . my aim is to use the changes from black to white to get a rough picture of the shape of somebodies head.i want the program to scan the image and each time it come across a change in pixel color from white to black or black to white i want the cordinates saved and so build a shape of the persons head (i will try to work on features later) .my idea is not set in stone and will still have to be changed many time before the project is complete but at the moment i need to know how to automatically scan each pixel in a picture box for change in color