PICTURE SIGNAL CORRECTION METHOD

摘要

PURPOSE:To reduce the memory capacity and to obtain a picture with high picture quality without unevenness by obtaining a picture data after correction from a picture data subject to A/D conversion of a picture signal read from an image sensor and a correction data. CONSTITUTION:A signal of picture information varied in 3 stages by 3 gradation of ND filter 20 and subject to photoelectric conversion by a CCD image sensor 22 is given to an amplifier 24, quantized by an A/D converter 26 and converted into a picture data v(i) whose luminous quantity is (i). The picture data v(i) is led to a signal correction section 28, where it is corrected and led to a signal processing section 30 as output data log V(i). The signal processing section 30 applies picture processing such as gradation correction or edge emphasis and the result is led to a dot picture signal generating section 32. The signal generating section 32 converts a picture data into a binary signal based on a prescribed dot signal and led to a laser scanning section 34. The scanning section 34 applies on/off control to the laser beam LF based on the binary signal and the laser beam LF is deflected by an optical deflector to form a dot picture on a film F.