Apparatus and method for adaptively controlling bit rate of...

Details Apparatus and method for adaptively controlling bit rate of... Apparatus and method for adaptively controlling bit rate of...

2006-09-12

2006-09-12

Rao, Andy (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240040, C375S240050

Reexamination Certificate

active

07106796

ABSTRACT:
Apparatus and method for adaptively controlling a bit rate of a video transcoder are disclosed. Logarithmic R-Q characteristics obtaining the adaptive R-Q characteristics suitable to characteristics of an inputted image are proposed, and the parameter (β) compensating the difference between the coding efficiency of MPEG-1 and the coding efficiency of MPEG-4 is not fixed as a specific value but changed adaptively according to the characteristics of an image. Accordingly, an accurate quantization parameter of MPEG-4 is generated. Thus, on the basis of the proposed concepts, the bit rate is adaptively controlled when the bit stream of MPEG-1 is converted into a bit stream of MPEG-4, so that the picture quality (PSNR) can be heightened and more accurate output bit rate can be obtained.

REFERENCES:
patent: 6490320 (2002-12-01), Vetro et al.
patent: 2003/0007558 (2003-01-01), Vetro et al.
Seo, Kwang-deok, Seong-cheol HEO and Jae-kyoon KIM, “A Rate Control Algorithm Based on Adaptive R-Q Model for MPEG-1 to MPEG-4 Transcoding in DCT Domain,” IEEE International Conference on Communications, Apr. 28-May 2, 2002, New York, NY, vol. 1. pp. 109-113.

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