| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal processor capable of obtaining a wide dynamic range video signal at an optimum level without causing losses. SOLUTION: In the case of obtaining a wide dynamic range video signal by adding a reference luminance video signal obtained so that a subject of reference brightness becomes a suitable level and a high luminance video signal obtained so that a subject brighter than a prescribed value becomes a suitable level by at least either one of different exposure conditions and different gain control, the knee-point and knee coefficient of the reference video signal and the multiplication coefficient of the high luminance video signal are calculated on the basis of the addition ratio of both the video signals calculated from the histogram of the high luminance video signal, the peak value of the high luminance video signal and the knee processing ratio of reference luminance video signal, the knee processing of the reference video signal is executed, the high luminance video signal is multiplied by the multiplication coefficient, and the knee-processed signal and the multiplied signal are mutually added to obtain a wide dynamic range video signal.
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