发明公开
EP1372340A3 Method and apparatus for dynamic contrast improvement in video pictures
有权
用于视频图像中动态对比度改进的方法和设备
- 专利标题: Method and apparatus for dynamic contrast improvement in video pictures
- 专利标题(中): 用于视频图像中动态对比度改进的方法和设备
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申请号: EP03021074.4申请日: 1999-05-21
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公开(公告)号: EP1372340A3公开(公告)日: 2004-01-28
- 发明人: Akbayir, Sahmusa
- 申请人: DEUTSCHE THOMSON-BRANDT GMBH
- 申请人地址: Hermann-Schwer-Strasse 3 78048 Villingen-Schwenningen DE
- 专利权人: DEUTSCHE THOMSON-BRANDT GMBH
- 当前专利权人: DEUTSCHE THOMSON-BRANDT GMBH
- 当前专利权人地址: Hermann-Schwer-Strasse 3 78048 Villingen-Schwenningen DE
- 代理机构: Schäferjohann, Volker Willi
- 优先权: EP98109976 19980602
- 主分类号: H04N5/57
- IPC分类号: H04N5/57
摘要:
A method and apparatus for dynamic contrast improvement in video pictures is proposed. There is a strong demand for picture contrast and high quality video. The picture contrast can't be increased by simply increasing the video signal amplitude because exceeding the display dynamic range in some video scenes causes unwanted disturbing effects. A basic solution for dynamic contrast improvement includes that the video pictures are analysed framewise in real time and the parameters of a transfer function (11) for contrast improvement are adjusted depending on the analysis results for the best subjective picture quality. Within this basic solution it is proposed to perform a step of adaptive signal splitting in which a noise reduced luminance signal (Y_CORED) is generated which then is transformed by means of the transfer function. This improves the picture quality by reducing the noise influence
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