Gamma correcting method, circuit and video-frequency processor

A technology of gamma correction and circuit, applied in the direction of color signal processing circuit, etc., can solve the problem of image quality degradation and achieve the effect of reducing storage space

Inactive Publication Date: 2007-01-03
HUAWEI TECH CO LTD
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a gamma correction method, which aims to solve the problem in the prior art that the image quality is greatly reduced by reducing the bit precision of the image to reduce the storage space occupied by the gamma correction table

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Gamma correcting method, circuit and video-frequency processor
  • Gamma correcting method, circuit and video-frequency processor
  • Gamma correcting method, circuit and video-frequency processor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0042] The invention greatly reduces the storage space occupied by the gamma correction table by querying the gamma correction table for the high bit part of the video input signal and performing low bit interpolation processing.

[0043] figure 2 The gamma correction circuit provided by the present invention is shown, including a digital video signal quantizer 201 , a gamma correction memory 202 storing a gamma correction table, an interpolation processor 203 and an adder 204 .

[0044] The specific processing process is detailed as follows:

[0045] First, the quantizer 201 decomposes the inpu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A gamma calibrating method includes dividing inputted K bit accuracy digital signal S to be high bit position signal H of M bit and low bit position signal L of N bit, querying gamma calibration table and outputting the first and the second gamma calibration values G and G1 corresponding to said signal H being used as pixel point adjacent to H pixel value, carrying out interpolation treatment on low bit position signal L and said calibration value G as well as said calibration value G1 then outputting error compensation value, adding said calibration value G on error compensation value and outputting gamma calibration value of said K bit accuracy digital signal.

Description

technical field [0001] The invention belongs to the field of video signal processing, in particular to a gamma correction method, circuit and video processor. Background technique [0002] Gamma correction can compensate for the non-linear relationship between the brightness level of the input signal and the output signal due to the non-linear characteristics of the display device. In a video processing system, gamma correction is generally implemented by using a look-up table, that is, the input pixel value and the corresponding output value after gamma correction are mapped to a correction table according to the gamma characteristic of the display device. If the input signal is 10-bit precision, the gamma correction table requires 2 10 =1024 storage units with a 10-bit width; for red-green-blue (Red-Green-Blue, RGB) color signals, it is necessary to perform gamma correction processing on the three components of R / G / B respectively, and a total of 3*1024 A 10-bit wide stor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/69
Inventor 孙春燕
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap