Method of rate control, video frame encoder and frame compression system thereof

A rate control and compression system technology, applied in the direction of digital video signal modification, pulse modulation TV signal transmission, television, etc., can solve the problems of inability to perform random access, inability to precisely control the compression ratio, etc., to achieve the effect of effective utilization
CN101540903AInactive Publication Date: 2009-09-23MEDIATEK INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MEDIATEK INC
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention provides a video frame encoder, comprising: a segment unit, segmenting a video frame into a plurality of frame segments; a data compressing module, coupled to the segment unit, compressing a frame segment according to a plurality of compression rates to generate a plurality of coded outputs respectively corresponding to the plurality of compression rates; a selecting module, coupled to the data compressing module, selecting an actual coded output from the plurality of coded outputs based on a target rate; and a packing unit, coupled to the selecting module, packing the actual coded output to generate compressed data. The video frame encoder provided by this invention controls the compression ratio to realize the random access, thereby allowing the part update of the video frame and realizing the effective utilization of the memory.
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Description

technical field

[0001] The invention relates to video frame compression, in particular to a frame buffer compression ratio control method and device thereof. Background technique

[0002] In order to meet the ever-increasing demands of display technology, high-resolution (high-resolution) and high-color (high-color) liquid crystal displays (Liquid Crystal Display, hereinafter referred to as LCD) have been widely used in the field of televisions. In general, frame buffers for storing images to be displayed on high resolution and high color LCDs require high activities frame buffer accesses. And this kind of highly active access operation will occupy a large amount of bandwidth, cause huge power consumption and shorten the service life of the battery. Therefore, data stored in the frame buffer needs to be compressed. According to existing compression rules, such as lossless compression LZW (Lempel-Zif-Welsh) or LZ77, lossy compression JPEG (Joint Photographic Experts Group, ...

Claims

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