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Method and device for correction gamma property of video communication

A correction method and video communication technology, applied in the field of video communication, can solve the problem of difficult application of Gamma correction and the like

Inactive Publication Date: 2011-04-27
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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  • Method and device for correction gamma property of video communication
  • Method and device for correction gamma property of video communication

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Embodiment Construction

[0110] 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 full-blind method for determining the Gamma characteristic parameter.

[0111] The realization principle of the full-blind Gamma characteristic parameter determination method of the present invention is as attached Figure 7 shown.

[0112] Figure 7 Among them, for the link that needs to determine the Gamma characteristic, the present inventio...

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Abstract

This invention provides a correction method and a device for video communication gamma property, which obtains a brightness histogram of output brightness signals to convert it to distributed probability density function of the output brightness signals and determines the extremum point of the function and sets up a math relation between the extremum points of the density function of the distributed probability of the output bright signal brightness and the input one and utilizes the math relation to convert the math relation between the distributed probability density functions of the input and output signals and the Gamma property function to the math relation of output signal brightness distributed probability density function and the Gamma property function to resolve the converted relation to determine Gamma property parameter and correct the Gamma part.

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 Patents(China)
IPC IPC(8): H04N9/69
CPCH04N5/202
Inventor 罗忠
Owner HUAWEI TECH CO LTD
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