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Correcting method and device for video frequency gamma property

A correction method and video communication technology, applied in the field of video communication, can solve problems such as difficult application of Gamma correction

Inactive Publication Date: 2007-10-10
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Correcting method and device for video frequency gamma property
  • Correcting method and device for video frequency gamma property
  • Correcting method and device for video frequency gamma property

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Embodiment Construction

[0103] In many application scenarios, the specific value of the output luminance signal, that is, all the knowledge is known, but the specific value of the input luminance signal, that is, the entire knowledge is not known. Although the entire knowledge of the input luminance signal is unknowable, partial knowledge of the input luminance signal, that is, a priori knowledge (a prioriknowledge) of the input luminance signal can be obtained, such as the statistical law of the probability distribution of the input luminance signal, etc., the present invention is precisely The prior knowledge of the input brightness signal and the knowledge of the output brightness signal are used to determine the Gamma characteristic parameters for Gamma correction. Since partial knowledge of the input luminance signal is utilized in the technical solution of the present invention, the method for determining the Gamma characteristic parameter in the present invention can be called a semi-blind meth...

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Abstract

The method comprises: according to the brightness histogram of the inputted brightness signals, resolving the mathematic relation between the brightness histogram and the Gamma characteristic function in order to determine the Gamma characteristic parameters by which making Gamma correction. By the invention, the Gamma correction can be made by only needing to input the brightness signal histogram and output the brightness signal histogram. The invention can be used in IPTV, cooperative data conference and public video communication where the low-end vide inputting device are widely used.

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