| 摘要 |
PROBLEM TO BE SOLVED: To provide a video signal processor for an endoscope capable of coping with normal light observation and obtaining the endoscopic images of excellent image quality even at the time of narrow band light observation. SOLUTION: The output signals of a CCD 29 provided with a color separation filter 30 are passed through a CDS circuit 32 or the like and separated into luminance signals Y and line sequential color difference signals Cr/Cb by a Y/C separation circuit 37, and the color difference signals Cr/Cb are changed to the passing band characteristics of a wide band at the time of the narrow band light observation mode by the switching operation of a mode changeover switch 14. Also, the matrix coefficient of a second matrix circuit 46 for performing conversion from three primary color signals to the luminance and color difference signals is changed as well, and in linkage with the switching operation, the chrominance signals of a long wavelength side are suppressed and the ratio of the chrominance signals on a short wavelength side is increased. COPYRIGHT: (C)2006,JPO&NCIPI
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