Adaptive quantization of video based on edge detection

Details Adaptive quantization of video based on edge detection Adaptive quantization of video based on edge detection

1994-10-18

1998-03-03

Tung, Bryan S.

Television

Bandwidth reduction system

Data rate reduction

348420, H04N 730

Patent

active

057240973

ABSTRACT:
A video signal is divided into blocks, and an orthogonal transform is performed on each block to obtain transformed coefficients. Of the transformed coefficients thus obtained, dominant transformed coefficients are selected from a low-frequency area and a high-frequency area, and based on the dominant transformed coefficients, an evaluation value is calculated, using which value a specific pattern in the video signal is detected. Based on the specific pattern thus detected, an optimum quantization step size is decided, and the transformed coefficients are adaptively quantized, thus preventing image quality degradation.

REFERENCES:
patent: 5150208 (1992-09-01), Otaka et al.
patent: 5251028 (1993-10-01), Iu
patent: 5369439 (1994-11-01), Matsuda et al.
patent: 5374958 (1994-12-01), Yanagihara
patent: 5491761 (1996-02-01), Kim

Affiliated with

Also associated with

Rating

Adaptive quantization of video based on edge detection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive quantization of video based on edge detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive quantization of video based on edge detection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2253136