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영상의 생동도(dynamic range)변환을 이용한 비디오카메라의 자동 노출조정 및 영상의 자동 화질보상
장종국 ; 장성식 김천대학교 1995 김천대학교 논문집 Vol.16 No.-
In video camera, an automatic video quality compensation method using dynamic range transform is proposed. The histogram is used to decide the non-uniformness of picture brightness caused by nonuniform lighting. The gray level is divied four regions, and the histogram is obtained per one field of video signal. We introduce a new parameter, nonuniformness, defined by the cumulative differ-ence bettween its CDF and LCDF. We also propose a decision func-tion of the dynamic range transform constant versus its nonuni-formness, and compensate the quality of video automatically.