Page 178 - Intelligent Communication Systems

[2

COMPUTER VISION

Computer vision (CV) is a technology that performs recognition of shape and color
of objects that exist in nature such as humans, animals, trees, forests or human-
made objects like constructions, handicrafts, cars, or roads. This chapter describes
basic theory and shows examples of computer vision.

12.! DEFINITIONS

12. i. I Definition of Image Data
Any image can be expressed as two-dimensional data by using the x and y axes.
Either the brightness of the image or its gray-level value at the point (x, y) can be
expressed by the following equation:

This equation shows the brightness g of surface-light-emitting devices such as a
television screen and a monitor of a personal computer. On the other hand, because
images such as photographs and drawings are not self-light-emitting objects, the

149