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Gamma characteristic correcting method and detecting method for determining equivalent model and parameter thereof

An equivalent model and correction method technology, which is applied in the field of video communication, can solve the problems of inaccurate gamma equivalent model selection and model parameter measurement, inability to accurately analyze and correct signal transmission gamma characteristics, and inability to use universal correction methods

Inactive Publication Date: 2007-01-03
HUAWEI TECH CO LTD
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  • Application Information

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Problems solved by technology

[0059] The invention provides a detection method for determining the gamma equivalent model and its parameters to solve the inaccurate gamma equivalent model selection and model parameter measurement in the prior art, so that it is impossible to accurately analyze and correct the signal transmission and processing links. Gamma characteristics;
[0060] At the same time, based on the above-mentioned detection method, a correction method suitable for both single-link and multi-link gamma characteristics is provided to solve the problem that the existing correction methods cannot be used universally

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  • Gamma characteristic correcting method and detecting method for determining equivalent model and parameter thereof
  • Gamma characteristic correcting method and detecting method for determining equivalent model and parameter thereof
  • Gamma characteristic correcting method and detecting method for determining equivalent model and parameter thereof

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Embodiment 1

[0124] Embodiment 1: Measurement method of gamma characteristic equivalent model parameters

[0125] The invention selection takes the following single-link equivalent model as a general model of Gamma characteristics as an example

[0126] Detailed description:

[0127] The first type of Gamma model: L out =pL in α +(1-p) 0

[0128] Among them: the domain of definition of the function shown in formula 5 (that is, the value range of the independent variable) is the interval [0, 1], the value range (the value range of the function value) is the interval [(1-p), 1], and the curve characteristics Such as Figure 11a As shown, obviously for the first type of model, if p=1, α=1, then there is L out =L in . Therefore, in actual measurement, if the parameters of the first type of model are p=1, α=1, or p is sufficiently close to 1 and α is sufficiently close to 1, it can be considered that the gamma characteristic of the link can be ignored without correction. A...

Embodiment 2

[0175] Embodiment 2, the correction method of multi-link Gamma characteristic:

[0176] Based on the measurement method of the gamma characteristic equivalent model parameters of the first embodiment, the functional relationship of the gamma characteristic equivalent model can be obtained, and the correction model can be constructed by using the inverse function of the function, and the single-link or multi-link gamma characteristic Correction is performed, and a detailed description will be given below taking a specific application in a multimedia information system as an example.

[0177] Such as Figure 9 As shown, in general, a multimedia information system is cascaded with multiple Gamma links. For different situations, such as situation A and situation B, the links participating in the cascade in the figure are ever-changing. Generally, Link 1 is the video camera / camera, while Link N t (the last one) is the display. In theory, a correction link (circuit implementation...

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Abstract

A method for calibrating gamma characteristic includes confirming calibration point and setting Na links before calibration point and Np links after calibration point, selecting the first equivalent model of equivalent Na links gamma characteristic and confirming its the first inverse model, selecting the second equivalent model of equivalent Np links gamma characteristic and confirming its the second inverse model, forming calibration link model according to two said inverse models, utilizing calibration link model to confirm calibration signal of the last output signal in Na links and inputting said calibration signal to Np links.

Description

technical field [0001] The invention relates to video communication technology, in particular to a detection method and a correction method for determining a gamma characteristic equivalent model and its parameters in video signal transmission and processing links. Background technique [0002] Gamma correction is a common problem in multimedia information systems that needs to be solved. For multimedia information systems, video / still images captured by cameras / cameras, computer-generated graphics / animations, and video / still images from other terminals in communication etc. In order to achieve a high-quality display effect on a display device and obtain a good user experience (User Experience, or Quality of Experience), Gamma correction must be performed. [0003] The situation that the multimedia information system related to the present invention involves Gamma correction includes the following aspects: [0004] Situation A: local terminal system, information is mainly p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/69H04N7/14
CPCH04N5/202H04N23/82
Inventor 罗忠
Owner HUAWEI TECH CO LTD