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Method and device for intensifying video image contrast

A technology of video image and contrast, applied in image communication, TV, color TV and other directions, can solve problems such as affecting the effect of real-time monitoring pictures

Active Publication Date: 2012-10-03
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex environment of the camera and other acquisition equipment, the weather (such as fog, snow), light (such as strong light, low light) and the quality of the camera itself will affect the quality of the captured image, and will eventually affect the quality of the image on the PC. Or monitor the effect of the real-time monitoring screen seen on the TV wall

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  • Method and device for intensifying video image contrast

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Embodiment Construction

[0044] In order to solve the problems existing in the prior art, the present invention proposes a new video image contrast enhancement method, that is, by determining the pixel boundary value of the dark area and the bright area in a frame of image, according to the determined two boundary values After the frame image is stretched in grayscale, the details of the stretched image are enhanced.

[0045] Before introducing the specific implementation scheme, it should be noted that in the video surveillance system, the image data before encoding or decoding are both luminance and color difference (YUV) signals, where Y is the luminance component, representing the brightness, U and V are chrominance components, representing color, and the contrast and layering of the picture are all represented by the Y component. Therefore, the solution of the present invention is realized by processing the Y component.

[0046] Based on the above introduction, the specific implementation of the ...

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Abstract

The invention discloses a method and device for intensifying video image contrast. The method comprises the following steps: determining a pixel boundary value for a dark area and a light area in a frame image; then carrying out gray expanding on the frame image in accordance with the determined pixel boundary value; and finally intensifying the dark area and the light area in the image subject to gray expanding to obtain an image with intensified contrast. The invention also discloses a device for intensifying video image contrast. By utilizing the method and device disclosed by the invention, the video image contrast can be dynamically intensified, and the real-time effect of a video picture can be improved.

Description

technical field [0001] The present invention relates to the technical field of video image processing, in particular to a method and device for enhancing contrast of video images. Background technique [0002] The basic composition of modern digital video surveillance system is as follows: figure 1 As shown in the figure, the camera collects the image, encodes the image through the encoder and outputs the code stream, and the code stream is transmitted through the network. On the one hand, each real-time monitoring point receives the code stream, decodes and displays it on the PC; Receive and decode the code stream, and transmit the real-time monitoring picture to the monitoring video wall, so as to complete the function of real-time monitoring. However, due to the complex environment in which the acquisition devices such as cameras are located, weather (such as fog, snow), light (such as strong light, weak light), and the quality of the camera itself will affect the qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/18H04N5/202H04N9/64
Inventor 陈航锋邓兵
Owner NEW H3C TECH CO LTD