this is a picture of a dog's contour and a horse's contour alt text http://www.tlnews.cn/forum/attachments/month_0810/20081024_2f055de790b83aced18atjm8EVN4Gyay.jpg
how to make computer know it is a horse or a dog or a person. alt text http://www.pocketgo.com.cn/upload/2008-10/122465306490637600.jpg
this will help http://people.csail.mit.edu/celiu/pdfs/SIFTflow.pdf
