III Standards-Based Codecs

Generic Model

Coding standards

JPEG [ FAQ.1, FAQ,2]
MPEG [ref]
H.261 [ref]
H.263 [ref]
etc.

all use the same basic methodology of exploiting spatial redundancy for compressing image data, and temporal redundancy for video data.

Spatial Redundancy Reduction Scheme

One example of reducing spatial redundancy is using the DCT-based scheme show in Figure 6.

Figure 6 Generic DCT-based coding/decoding scheme