Title:
【発明の名称】ガンマ補正回路
Document Type and Number:
Japanese Patent JP3045245
Kind Code:
B2
Abstract:
PURPOSE:To realize the gamma correction circuit whose gamma correction characteristic is made variable with a smaller circuit scale than that of a conventional circuit by multiplying a coefficient K with a value read from a memory circuit so as to make the gamma correction characteristic variable. CONSTITUTION:A memory circuit 11 stores a difference between a level of a gamma correction characteristic curve and a level of a straight line Y=X by using a level of an input signal as an address. A multiplier circuit 12 multiplies a coefficient K with a value read from the memory 11 based on the level of the input signal and an adder circuit 13 adds an output of the multiplier circuit 12 and the input signal X to make the gamma correction characteristic variable. Thus, the gamma correction circuit whose gamma correction characteristic is made variable is realized with a smaller circuit scale than that of a conventional circuit.
Inventors:
Hideaki Murayama
Application Number:
JP12683390A
Publication Date:
May 29, 2000
Filing Date:
May 18, 1990
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04N5/202; (IPC1-7): H04N5/202
Domestic Patent References:
| JP62287779A | ||||
| JP55102262U |
Attorney, Agent or Firm:
Akira Koike (2 outside)