Method and device used for improving screen contrast

A contrast and screen technology, applied in the system field of improving screen contrast, can solve problems such as excessive consumption, obvious processing traces, insufficient processing quality, etc., to achieve the effect of quality improvement, enhancement of contrast range, and natural and smooth playback of dynamic videos

Active Publication Date: 2012-11-28
SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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Problems solved by technology

Of course, the former needs to consume too many registers or RAM / ROM resources, while the processing traces of the latter are too obvious, and the processing quality is obviously insufficient

Method used

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  • Method and device used for improving screen contrast
  • Method and device used for improving screen contrast
  • Method and device used for improving screen contrast

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Embodiment Construction

[0034] The present invention is applied in the field of post-processing of digital TV video, such as set-top boxes, digital TV all-in-one machines and the like. The present invention dynamically adjusts the contrast of the output video through the statistical analysis of the original video information, so as to achieve the purpose of increasing the contrast range of the output video, and the quality of the video image will be correspondingly improved.

[0035] like Figure 1-5 As shown, the present invention adopts a dynamic self-adaptive method to re-statistically distribute the brightness value of the entire video image, which can effectively expand the dynamic contrast range, and there is no obvious processing trace in human perception, and the dynamic video playback is natural and smooth.

[0036] The present invention only uses a 256×24bit SRAM to complete all the processing functions of the dynamic adaptive contrast enhancement, wherein the 256×16bit SRAM is used to stor...

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Abstract

The invention provides a method used for improving screen contrast, which comprises the following steps of: truncation histogram statistic: the statistic on the luminance signal distribution characteristic of the whole screen is made; cumulative probability distribution function: the cumulative probability distribution function of the luminance signal in the truncation interval is obtained; and Gamma mapping table generation: the Gamma mapping table of the current screen display content is obtained through the cumulative probability distribution function, and the luminance mapping value based on the histogram statistic is obtained through searching the table. The method and device have the beneficial effects that through statistic analysis on the original video information and adjusting the contrast of the video output dynamically, the aim of expanding the contrast range of the video output is achieved, and the quality of the video image can be improved correspondingly. According to the method and device, all the processing functions of dynamic self-adapting contrast enhancement can be finished only by adopting one 256*24 bit SRAM (Static Random Access Memory), so that the hardware design has considerable advantages on the consumed hardware resources.

Description

Technical field: [0001] The invention relates to the field of video post-processing, in particular to a system for improving screen contrast applied to a TV receiving system in the field of digital TV video post-processing. Background technique: [0002] As we all know, in the field of digital TV video post-processing, such as set-top boxes, digital TV all-in-ones, etc., due to the limitations of many objective conditions such as camera equipment, camera recording environment, video transmission path, etc., the video information actually transmitted to the set-top box / all-in-one may have a contrast range. Small, the image is partially or overall dark, bright and many other deficiencies. [0003] In the prior art, different RAMs / ROMs are generally used to perform luminance statistics, integral calculations, and gamma table luminance conversions on video signals when doing contrast enhancement systems, or to perform the same processing on all input videos in a non-dynamic (non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/57
Inventor 刘宇轩刘志恒孙军戴杨管云峰
Owner SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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