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Shaping method and apparatus for rapid jumping video signal of mobile analog television

A technology for simulating TV and video signals, applied to color TV parts, TV system parts, TVs, etc., can solve problems such as black vertical stripes on the screen, CVBS signal level signal loss, etc.

Active Publication Date: 2013-04-17
HUAWEI TEHCHNOLOGIES CO LTD
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  • Claims
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Problems solved by technology

[0004] However, when the CVBS signal level jumps rapidly, the usual gain adjustment and black level control methods cannot respond to the sudden change in time, resulting in the loss of the upstream signal after the sudden change in the CVBS signal level, and black vertical stripes appearing on the screen

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  • Shaping method and apparatus for rapid jumping video signal of mobile analog television
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  • Shaping method and apparatus for rapid jumping video signal of mobile analog television

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] In the embodiment of the present invention, when the CVBS level jumps rapidly, there will be a large gap between the black levels between the rows, resulting in the destruction of one or more rows of CVBS that are changing. The CVBS of the previous line is cached by the line buffer, and the compensation level of the sampling point in the previous line of CVBS is calculated from the black level of the current line of CVBS and the black level of the previous line of CVBS, and then the black level of the sampling point is compensated. Make CVBS have a uniform black level, further make CVBS have a uniform signal amplitude, and avoid black vertical stripes caused by the loss of upstream signals after CVBS level mutations.

[0034] ...

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Abstract

The invention relates to a shaping method for a rapid jumping video signal of a mobile analog television. The method comprises the following steps: real-time detecting a black level of a composite video broadcast signal (CVBS) of a last row and a black level of a CVBS of a current row and taking a difference value between the black level of the CVBS of the last row and the black level of the CVBS of the current row as a height difference of the black level of the last row; And calculating compensated levels of all sampling points in the CVBS of the last row point by point by utilizing the black level of the CVBS of the last row and the height difference and compensating black levels of the sampling points by the compensated levels, so that the CVBS has a unified black level. In addition, the invention also discloses a shaping apparatus for a rapid jumping video signal of a mobile analog television. After the application of the embodiment of the invention, when a CVBS level jumps rapidly, the CVBS can have a unified black level and a signal amplitude, so that occurrence of a black vertical strip is avoided.

Description

technical field [0001] The present invention relates to the field of mobile analog television, and more particularly, to a method and device for shaping video signals of fast-jump mobile analog television. Background technique [0002] In analog TV, the entire process of image signal generation, processing, transmission and receiver restoration is almost completed under the analog system. It is characterized by sampling on the time axis, sampling in the vertical direction for each frame, and transmitting TV image signals in the form of amplitude modulation. In order to reduce the frequency band and avoid the sensitive frequency of human eyes to image reproduction, a frame of image is divided into odd and even field scanning. [0003] In analog TV signal reception, it is necessary to use automatic gain control to process signals with continuously changing amplitudes, and at the same time, it is necessary to track the black level (black level) of composite video broadcasting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/14H04N5/44
Inventor 张辉王西强钱炜杨利李志鑫
Owner HUAWEI TEHCHNOLOGIES CO LTD
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