发明授权
- 专利标题： Adaptive coding level control for video compression systems
- 专利标题（中）： 视频压缩系统的自适应编码电平控制
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申请号： US900904申请日： 1992-06-18
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公开(公告)号： US5291281A公开(公告)日： 1994-03-01
- 发明人: Woo H. Paik , Edward A. Krause , Vincent Liu
- 申请人： Woo H. Paik , Edward A. Krause , Vincent Liu
- 申请人地址： PA Hatboro
- 专利权人： General Instrument Corporation
- 当前专利权人： General Instrument Corporation
- 当前专利权人地址： PA Hatboro
- 主分类号： H03M7/30
- IPC分类号： H03M7/30 ; G06T9/00 ; H04N7/26 ; H04N7/30 ; H04N7/32 ; H04N7/50 ; H04N7/133
摘要：
An apparatus and method for adaptively compressing blocks of video image data provide a local coding level for use in compressing successive blocks of video image data. Each block is preliminarily compressed using a global coding level. The preliminarily compressed data is processed to provide a measure of the randomness of an image area represented by the block of video image data. A local coding level is generated based on the randomness measure. The video image data is then compressed using the local coding level to provide compressed data for transmission. One or more intermediate compression stages can be provided, each generating an intermediate coding level, to better refine the randomness measure for use in generating the local coding level.
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