发明名称 |
Detection and supression of flicker in a sequence of images |
摘要 |
<p>The invention relates to a method, device and computer-program product for detection of undesired temporal variations (flicker) in a sequence of video frames. In one embodiment, frame-wise luminance means are compared with a reference level and the crossing frequency is compared with expected variation frequencies, such as frequencies associated with an illumination frequency through aliasing. The crossings count can be refined by introducing a latency zone around the reference level. In case of a positive detection of an undesired temporal variation, there is further provided a correction method, device and computer-program product using cumulated distribution functions. The visual detriment of flicker-induced saturation of pixels is alleviated either by brightening non-saturated pixels or by replacing the saturated pixels by randomly sampled values in accordance with a reference cumulated distribution function. The invention provides embodiments suitable for real-time processing of streamed video sequences.</p> |
申请公布号 |
EP2262228(A1) |
申请公布日期 |
2010.12.15 |
申请号 |
EP20090162228 |
申请日期 |
2009.06.09 |
申请人 |
GLOBAL IP SOLUTIONS (GIPS) AB;GLOBAL IP SOLUTIONS, INC. |
发明人 |
KLEIJN, WILLEM BASTIAAN;VOELCKER, BJOERN |
分类号 |
H04N5/44;H04N5/235 |
主分类号 |
H04N5/44 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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