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Emendation method and apparatus for gamma characteristic of video communication

A technology of video communication and gamma, which is applied in the field of video communication and can solve problems such as difficult application of gamma correction

Inactive Publication Date: 2008-02-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current non-blind measurement method for determining Gamma characteristic parameters makes Gamma correction difficult to apply, and the method of measuring with special instruments increases the implementation cost of video communication services

Method used

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  • Emendation method and apparatus for gamma characteristic of video communication
  • Emendation method and apparatus for gamma characteristic of video communication
  • Emendation method and apparatus for gamma characteristic of video communication

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Embodiment Construction

[0094] In many application scenarios, the specific value of the output luminance signal, that is, all knowledge, is known, but the specific value of the input luminance signal is not known, or even any knowledge of the input luminance signal is unknown. The present invention only utilizes the knowledge of the output luminance signal to determine the Gamma characteristic parameter for Gamma correction. Since no knowledge of the input luminance signal is used in the technical solution of the present invention, the method for determining the Gamma characteristic parameter in the technical solution of the present invention can be called a method for determining the Gamma characteristic parameter of a full blindness.

[0095] The implementation principle of the blind Gamma characteristic parameter determination method of the present invention is shown in FIG. 7 .

[0096] In FIG. 7 , for the link that needs to determine the Gamma characteristic, the present invention determines the...

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Abstract

This invention provides a correcting method and a deivce for Gamma property of video communication, which gets a histogram of an output brightness signal and converts it to a distribution probability density function, selects a math form of input brightness signal distribution probability density function and transforms the question according to the math relation among the density functions of the input and output brightness distribution probability density to set up a prior math target function to get a restricted math prior question, and the rectriction condition is got by own properties of the Gamma character function and the density function of the input brightness signal, and solves the restricted math prior problem to determine the Gamma character parameter then to correct the Gamma link accordingly.

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 communication. Background technique [0002] Video communication, especially multi-party video communication, is currently being widely used 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 network QoS such as packet loss, delay,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/69
CPCG06T2207/10016G06T5/40H04N5/202G06T5/009G06T5/92
Inventor 罗忠
Owner HUAWEI TECH CO LTD
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