Emendation method and apparatus for gamma characteristic of video communication

Abstract

The present invention provides a method and device for correcting the gamma characteristic of video communication: obtain the brightness histogram of the output brightness signal, convert it into the brightness distribution probability density function of the output brightness signal, and select the mathematical method of the brightness distribution probability density function of the input brightness signal Form; according to the mathematical relationship between the input and output brightness distribution probability density functions and the Gamma characteristic function, the problem description is transformed, so as to establish a mathematical optimization objective function and obtain a constrained mathematical optimization problem; the constraints The condition is obtained by the characteristics of the Gamma characteristic function and the probability density function of the input luminance signal brightness distribution; solving the constrained mathematical optimization problem to determine the gamma characteristic parameter; performing the gamma link according to the gamma characteristic parameter Gamma correction. The totally blind gamma characteristic parameter determination method of the present invention reduces the prerequisite requirements for gamma correction, thereby improving the usability of gamma correction and widening the application range of gamma correction.

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,...

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

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