Method for coding video pictures by determining a sub-target...

Details Method for coding video pictures by determining a sub-target... Method for coding video pictures by determining a sub-target...

2007-08-14

2007-08-14

Lee, Young (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

Reexamination Certificate

active

08604698

ABSTRACT:
The bitrate control of known video encoders is based on a control of the quantization step size per picture block. In transform coding of relatively large picture blocks, the video picture comprises a too small number of picture blocks to obtain a desired number of bits per picture. In conformity with the invention, the target value for the number of bits per picture block is divided into N sub-targets (Rt(k,n)). The series of coefficients of a picture block is divided into N segments (L(n)) with reference to an estimation for the cumulative distribution20of the bit cost per picture block. The quantization step size is subsequently adapted per segment to the corresponding sub-target. Since the number of segments is N times larger than the number of picture blocks, an accurate bitrate control is possible. If desired, the estimation for the cumulative distribution is adapted from picture to picture.

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patent: 5144424 (1992-09-01), Savatier
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“Hardware Implementation of the Framestore and Data Rate Control for a Digital HDTV-VCR” K. Gruneberg et al, HDTV Symposium, Japan, Nov. 1992.

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