Video input equipment gamma characteristic correcting method and apparatus in video communication

A video input device and input device technology, applied in the field of video communication, can solve the problems of poor application range, large consumption, and high implementation cost

Inactive Publication Date: 2008-03-05
HUAWEI TECH CO LTD
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] In the second method, Gamma correction will cause the loss of video signal due to the rounding error caused by the operation. Moreover, a large number of multiplication operations will cost a lot, especially in the software implementation. The consumption of calibration by look-up table method is much larger
[0034] From the above description, it can be seen that the current Gamma correction method has problems such as high implementation cost, poor application range, and serious resource consumption.

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
  • Video input equipment gamma characteristic correcting method and apparatus in video communication
  • Video input equipment gamma characteristic correcting method and apparatus in video communication
  • Video input equipment gamma characteristic correcting method and apparatus in video communication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0115] When Gamma correction is directly performed on the video signal in the video image output by the video input device in the YUV color space, the Gamma correction performed on the y, u, and v signal components of the video signal will involve the three signal components of r, g, and b. In this way, the Gamma corrections of the three channels of Y, U, and V are not independent of each other, but are tightly coupled together, which greatly improves the direct acquisition in YUV color space from the Gamma characteristics of the r, g, and b signal components. The difficulty of the correction function for Gamma correction increases the difficulty of performing Gamma correction on the video signal output by the video input device in the YUV color space.

[0116] The invention provides an effective and feasible technical solution for directly performing Gamma correction on the video signal in the video image output by the video input device in the YUV color space. A schematic di...

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

The method includes operations:(1) Divide the RGB color space (RCS) into multi-cells, (2) linearize the gamma feature function (GFF) of the video input device (VID) cell by cell, (3) correspondingly map all cells of RCS into the YUV color space (YCS) to convert YCS into cells, (4) build linear GFF having unified format and different parameters, (5) use linear GFF and linear gamma correct function (LGCF) to relate the corrected YCS vector with the non-distortion RGB color vector (NRCV) to ensure the related vector and NRCV in the same signal space, (6) use the related vector and NRCV to set a mathematic optimizing subject, (7) solve this subject and obtain parameters of LGCF of all cells of YCS, (8) finally cell by cell gamma-correct the video signal of YCS output from VID according to the gamma correct function. This invention reaches the aims about the gamma correct: easy to use, extensive application range and low cost.

Description

technical field [0001] The invention relates to the technical field of video communication, in particular to a method and device for correcting gamma characteristics of video input equipment in video communication. Background technique [0002] Video communication, especially multi-party video communication, is currently being used more and more widely with the rapid development of broadband networks. Domestically and internationally, video conferencing and videophone services are becoming basic services on NGN (Next Generation Network, Next Generation Network). Telecom operators in various countries also attach great importance to this market opportunity. It is expected that in the next few years, the video communication service will become an important business growth point for operators. [0003] A key issue in developing video communication services is to improve end-to-end user experience (User Experience or Quality of Experience). In user experience, in addition to ...

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 罗忠
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