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Method and apparatus for correcting video-flow gamma characteristics of video telecommunication terminal

A terminal correction and video communication technology, applied in the field of video communication, can solve the problems of local correction of gamma characteristics of video streams, etc., to achieve the effect of improving quality and user experience, and reducing the amount of data transmission

Inactive Publication Date: 2007-09-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] The present invention provides a method and device for video communication terminals to correct the gamma characteristics of video streams, so as to solve the problem that the gamma characteristics of video streams cannot be locally corrected on the communication terminal side in the prior art

Method used

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  • Method and apparatus for correcting video-flow gamma characteristics of video telecommunication terminal
  • Method and apparatus for correcting video-flow gamma characteristics of video telecommunication terminal
  • Method and apparatus for correcting video-flow gamma characteristics of video telecommunication terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Embodiment 1. Method for Correcting the Gamma Characteristics of a Video Stream by a Video Communication Terminal

[0098] The correction of video stream Gamma characteristics includes three situations:

[0099] 1. Gamma correction for outgoing video streams

[0100] The outbound video stream is output from the local terminal, through the network to the central communication node such as the multi-point control unit, or the video code stream to other video communication terminals. The requirement is that the Gamma value of the outgoing video stream should be corrected to 0.45. That is to say, the achieved effect is equivalent to that the video code stream comes from a video input device with an ideal Gamma value. So if the video input device is ideal, ie has a Gamma of 0.45, then no correction is required. If not, use gamma Cam Indicates the Gamma value of the video input device, then the Gamma value of the Gamma correction module output to the video streamγ Cor Eq...

Embodiment 2

[0144] Embodiment 2. A structure of Gamma correction equipment

[0145] In summary, a structure of a calibration device for implementing the calibration method of the present invention is shown in Figure 7, including, wherein the calibration module includes the following three sub-modules:

[0146] 1. Outgoing video stream Gamma correction sub-module

[0147] Connected between the video input device and the video codec to perform Gamma correction on the outgoing video stream;

[0148] The module first judges gamma Cam =Whether 0.45 is set up, if it is, the local video stream is directly transmitted to the video codec, otherwise it is corrected;

[0149] This module has corrected gamma values ​​γ Cor =0.45 / γ Cam , after obtaining γ Cam On the basis of Cor , and then hardware circuit or software can be used to realize the correction, among which: the standard power function input and output characteristics can be realized by using the hardware circuit method. There are qui...

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PUM

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Abstract

The invention is used for solving the issue existed in currently-used technology that is the GAMA character of video stream can't be locally corrected at communication terminal. The method thereof comprises: when outputting local video stream, the GAMA value of local video stream is corrected as the first target GAMA value, which is outputted; when receiving the incoming video stream whose GAMA value is the first target GAMA value, the GAMA value of the incoming video stream is corrected as the reciprocal of local display device; then transmitting it to the local display device; when display local video stream, the GAMA value of local video stream is corrected as the reciprocal of local display device; then transmitting it to the local video display device. The apparatus thereof comprises: a module for saving the GAMA parameters of the video inputting device and the video displaying device, and a correction module.

Description

technical field [0001] The invention relates to video communication technology, in particular to a method and equipment for locally correcting video stream gamma characteristics by a video communication terminal. Background technique [0002] 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 can be expected that in the next few years, video communication services will become an important business growth point for operators. A key issue in developing this type of business is to improve the end-to-end (End-to-end) user experience (UserExperience, or Quality of Experience). In user experience, in addition to network QoS (packet loss, delay, jitter, R factor, etc.) para...

Claims

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Application Information

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IPC IPC(8): H04N9/69G09G5/00
CPCH04N9/69
Inventor 罗忠
Owner HUAWEI TECH CO LTD
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