Method and apparatus for emending gamma characteristic of video display equipment in video communication

Abstract

The invention provides a method and device for correcting gamma characteristics of video display equipment in video communication. The RGB color space is divided into multiple cells, and the gamma characteristic function of the video display device is linearized cell by cell. Each cell of the RGB color space is mapped to the YUV color space one-to-one to realize the cellization of the YUV color space, and a linear gamma correction function with a uniform form but different parameters is established for each YUV cell. The linear gamma characteristic function and the linear gamma correction function are used to correlate the distorted RGB color space vector and the uncorrected YUV color space vector, so that the correlated vector and the uncorrected YUV color space vector are located in the same signal space, and the correlated vector is used The average generalized distance minimum criterion between the vector and the uncorrected YUV color space vector sets a mathematical optimization problem, and solves the problem to obtain the parameters of the linear gamma correction function on each cell of the YUV color space; finally, according to the gamma correction function to It is necessary to perform cell-by-cell gamma correction on the YUV video signal input to the video display device. The invention achieves the purposes of improving the usability of the gamma correction, broadening the application range of the gamma correction, and reducing the realization cost of the 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 display 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 t...

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.

Images