Writing a program to play chess is easy. A very large part of our brain is devoted to visual information processing. The visual capabilities of even the simplest animals are spectacularly impressive. Our own capabilities go far beyond the most advanced computer vision systems. A device such as a TV camera is used to get the information from the environment.
Object identification tries to discover what objects the computer is looking at.
This involves finding characteristic features and using a database. Scene reconstruction tries to discover where the objects are relative to the camera, and what shape they are. The bottom-up approach Strongly influenced c. 1980 by David Marr . First do some image processing . Edges are places where the image brightness changes rapidly and consistently.