# US 5,345,265 A · Gamma correction circuit for a video camera

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- Number: US 5,345,265 A
- Document ID: US5345265A
- Status: Granted
- Kind: A
- Application number: 08/174,811
- Filed: 1993-12-29
- Granted: 1994-09-06
- Earliest claimed: 1992-12-31
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Seong-hoon Kim
- Web page: https://patentgrep.com/patent/US5345265A

## CPC

- H04N 23/83: specially adapted for colour signals
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A gamma correction circuit for single-plate type video camera having a correlation double sampling device and receiving the signal output from a complementary-filter-type charge coupled device (CCD) to thereby produce a color line sequence signal, includes a luminance signal detector for detecting the luminance signal frown the color line sequence signal; a first gamma-corrector for performing gamma-correction to the detected luminance signal from the luminance signal detector; a second gamma-corrector for gamma-correcting the color line sequence signal; a color difference signal detector for detecting the color difference signal from the color line sequence signal which is gamma-corrected by the second gamma-corrector; and a mixer for mixing the gamma-corrected luminance signal which is gamma-corrected by the first gamma-corrector with the gamma-corrected color difference signal which is detected by the color difference signal detector. Accordingly, the gamma-correction circuit performs gamma-correction to the color line sequence signal being output from the correlation double sampling device, so that the circuit can be simplified.

## Claims

### Claim 1

A gamma correction circuit for use in a video camera including a complementary-filter-type charge coupled device (CCD) and a correlation double sampling device receiving a signal produced from the CCD and producing a color line sequence signal, comprising:
a luminance signal detector for detecting the luminance signal from said color line sequence signal;
a first gamma-corrector for performing gamma-correction to the detected luminance signal from said luminance signal detector;
a second gamma-corrector for gamma-correcting said color line sequence signal;
a color difference signal detector for detecting the color difference signal from the color line sequence signal which is gamma-corrected by the second gamma-corrector; and
a mixer for mixing the gamma-corrected luminance signal which is gamma-corrected by said first gamma-corrector with the gamma-corrected color difference signal which is detected by said color difference signal detector.