| 摘要 |
PURPOSE: To improve the S/N ratio and to provide exact gamma correction in a dynamic gamma processing circuit by enlarging the dynamic range of the input signals of an A/D conversion circuit. CONSTITUTION: In an image signal processing device which conducts the contrast adjustment of image signals and gamma correction using contrast information and the brightness information (e.g. APL) of image signals, the device is provided with a ROM 32 which previously stores the gamma correction data corresponding to the contrast information and the brightness information (APL). The corresponding gamma correction data is read from the ROM 32 using the contrast information and the brightness information of image signals as addresses and, using this gamma correction data, a dynamic gamma processing circuit 34 is installed to conduct contrast adjustment and gamma correction to unnecessitate analog contrast adjustment. |
