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Video signal collection apparatus

A technology of video signal and acquisition equipment, which is applied in the field of video communication, can solve the problem of lack of adaptive correction ability of video signal gamma characteristics, and achieve the effect of improving the quality of experience

Inactive Publication Date: 2008-02-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The present invention provides a video signal acquisition device, the video signal acquisition device has a gamma characteristic correction function, to solve the problem in the prior art that the video signal acquisition device lacks the adaptive correction capability for the gamma characteristic of the video signal

Method used

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  • Video signal collection apparatus
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Embodiment Construction

[0071] As the basis for the implementation of the present invention, a general method for correcting multi-link Gamma characteristics using Gamma paths is firstly introduced here.

[0072] Please refer to Figure 6, assuming that the Gamma path of the video signal from acquisition to output includes N t A cascaded Gamma link, you can choose a correction point between any two links. The correction link divides the Gamma path of the image into two sections, and the correction point includes N a links, including N after the correction point p link.

[0073] As shown in Figure 7, first determine the N a links and N p The equivalent comprehensive Gamma characteristics of each link, and then respectively construct the correction sub-links of the equivalent Gamma characteristics, and then insert the correction point after compounding the two correction sub-links, the correction link is actually the compound of the two correction sub-links, specifically including Follow the steps b...

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Abstract

The disclosed equipment includes following parts: camera shot module for collecting video signal, and control module for parsing correction and control command, and outputting corresponding indicator signal; process module for obtaining Gamma characteristic parameter relevant to the video signal based on the said indicator signal, and for calculating and outputting correction parameter of Gamma characteristic; correction generation module for correcting Gamma characteristic of video signal based on the said correction parameter of Gamma characteristic. The invention adds procedure of Gamma correction, which is suitable to any camera / camera head and subsequent modules in the equipment. Circuit and hardware or software can realize the function of Gamma correction. The invention raises experience quality of TV users.

Description

technical field [0001] The invention relates to video communication technology, in particular to a video signal acquisition device with gamma characteristic correction function. Background technique [0002] Video communication is being widely used with the rapid development of broadband network. Domestically and internationally, video conferencing and videophone services are becoming the basic services on NGN (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. [0003] A key issue in developing this type of business is to improve the end-to-end (End-to-end) user experience (User Experience, or Quality of Experience). In user experience, in addition to network QoS (packet loss, delay, jitter, R factor, etc.) parameters, for video, the Gamma nonlinearity caused by each ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/217H04N7/14
CPCH04N9/69H04N23/83
Inventor 罗忠
Owner HUAWEI TECH CO LTD