Bit rate control mechanism for digital image and video data comp

Details Bit rate control mechanism for digital image and video data comp Bit rate control mechanism for digital image and video data comp

1997-09-18

1999-11-30

Britton, Howard

Television

Bandwidth reduction system

Data rate reduction

348394, 348405, 348415, 348419, H04N 712

Patent

active

059951516

ABSTRACT:
A bit rate control mechanism for a digital image or video compression system estimates a complexity parameter for a current picture, or block of samples, of a video signal as a function of parameters for a prior picture of the video signal, which parameters include a bit rate. From the complexity parameter a quality factor for the current picture is determined and applied to a quantizer to compress the current picture. A complexity pre-processor may also be used to detect scene changes in the video signal prior to estimating the complexity parameter. If there is a scene change detected, then the rate control mechanism is reset prior to estimating the complexity parameter for the first picture in the new scene. Also a video buffer verifier is controlled so that the buffer occupancy at the end of a specified image sequence is at a target value so that looping and editing applications are facilitated.

REFERENCES:
patent: 5686964 (1997-11-01), Tabatabai

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