k18_037_4

Page 45

TECHNOLOGIES

4

Motion Compensation

In almost any video, each frame is similar to the previous one. They have a common, nearly static background, and only some objects move relative to others. It seems quite natural to want to code only those elements that change, but not the ones that stay the same.

This example illustrates how similar all the subsequent frames are.

Here are examples of frame-to-frame difference showing you how few pixels actually change.

45

SUBSCRIBE


Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.