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The basic approach to H. 261 Compression is summarised as follows:
- Decoded Sequence
- Frame types are CCIR 601 CIF (352x288) and QCIF (176x144)
images with 4:2:0 subsampling.
- Two frame types: Intraframes (I-frames) and Interframes
(P-frames)
- I-frames use basically JPEG
- P-frames use pseudo-differences from previous
frame (predicted), so frames depend on each other.
- I-frame provide us with an accessing point.
Dave Marshall
10/4/2001