Frame compression using differential codes and an escape code

Details Frame compression using differential codes and an escape code Frame compression using differential codes and an escape code

2006-01-17

2006-01-17

Wong, Allen (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240000, C375S240120, C375S240150, C375S240240

Reexamination Certificate

active

06987807

ABSTRACT:
Digital video data streams that conform to standards such as the ITU-T H.263 and MPEG-4 ISO/IEC standards are compressed to reduce the amount of memory needed to store these streams. Information for groups of pixels are compressed into segments of encoded information. Each segment of encoded information includes luminance values that are rounded and truncated, the full-length values of chrominance information for the first pixel in the group, and codes that represent differences in chrominance values between adjacent pixels in the remainder of the group. A special “escape” code is used to represent the chrominance value for a pixel whenever the difference in chrominance values between that pixel and the preceding pixel exceeds a threshold.

REFERENCES:
patent: 5473378 (1995-12-01), Tamitani
patent: 5973744 (1999-10-01), Kim

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