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    • 2. 发明专利
    • PHOTOTELEGRAPHIC APPARATUS
    • JPH01231571A
    • 1989-09-14
    • JP5865488
    • 1988-03-11
    • NEC CORPNIPPON ELECTRIC ENG
    • TAKAMATSU FUKUICHIYAMAMOTO AKIRATERAOKA MITSUAKI
    • H04N1/00H04N1/40H04N1/407
    • PURPOSE:To obtain a reproduced picture having its contrast corrected optionally by preparing plural types of gradation characteristic curve data and designating a level range of said data for production of the gradation correction data. CONSTITUTION:A CPU 13 of a gradation correcting part 1 reads the designated gradation characteristic data out of a ROM11 based on a selection instruction to store the data into a RAM12 and also to transfer it to a control part 3. Then the CPU13 produces the gradation correction data from the data on a gradation characteristic curve in accordance with a correcting level range included in the selection instruction received from the part 3. In other words, the CPU13 performs an arithmetic operation to change an input level range (a) of a gradation characteristic curve A into a designated level range (b). Then the obtained output level data on a gradation correcting curve B corresponding to the curve A is stored in the RAM12 and at the same time sent to the part 3. The part 3 gives both input and output levels of the gradation correction data to a display part 4 to show them in the image forms. Thus the correction picture data 15 of corrected multi-gradation is obtained.