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Processing method and device of image contrast

A technology of image comparison and processing method, applied in the field of image processing, which can solve the problems of reducing the display effect and achieve the effect of enhancing the display effect

Active Publication Date: 2010-10-27
HANGZHOU HIKVISION DIGITAL TECH
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Problems solved by technology

[0005] The purpose of the embodiment of the present application is to provide a processing method and device for image contrast, so as to solve the problem in the prior art that performing contrast optimization on digital video images on a display terminal will reduce its display effect

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  • Processing method and device of image contrast
  • Processing method and device of image contrast
  • Processing method and device of image contrast

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no. 1 example

[0070] see figure 2 , which is the flow chart of the first embodiment of the image contrast processing method of the present application:

[0071] Step 201: Acquire a frame of image to be processed.

[0072] Step 202: Perform histogram statistics on each channel corresponding to the color space of a frame of image to obtain histogram statistics information.

[0073] Specifically, calculate the number of pixels corresponding to each gray level in each channel corresponding to the color space of a frame of image, and output the normalized number of pixels that appear in each gray level in each channel according to the number of pixels Probability, the probability of occurrence of each gray level as the histogram statistics of each channel.

[0074] Step 203: Adjust the pixel gray level distribution of the image according to the histogram statistical information, and output the mapping relationship between the pixel gray level before adjustment and the adjusted pixel gray leve...

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Abstract

The embodiment of the invention discloses a processing method and a device of image contrast, which is used for processing image contrast in digital camera equipment. The method comprises the following steps: acquiring a frame image to be processed; carrying out histogram statistics for each channel corresponding to the color space of the frame image so as to acquire histogram statistical information; adjusting the pixel gray level distribution of the image according to the histogram statistical information, and outputting the mapping relation between the unadjusted pixel gray level and the adjusted pixel gray level; and remapping the pixel gray value of the image according to the mapping relation to acquire the image with processed contrast. The embodiment of the invention realizes the enhancement of the image contrast before the image is compressed or transferred, thereby avoiding the problem that the noise or the interference of the image is further expanded caused by carrying out contrast enhancement for the image with quality reduction after the image is compressed or transferred; and front-end optimization of the contrast is carried out in the digital camera equipment, thereby enhancing the display effect of video images.

Description

technical field [0001] The present application relates to the technical field of image processing, in particular to an image contrast processing method and device. Background technique [0002] A camera is an electronic device that acquires images, and it can convert optical image signals into electrical signals, thereby realizing image storage. With the development of camera technology, digital cameras with high resolution and flexible interfaces are usually used to acquire images. When acquiring video images, due to weather reasons, images with insufficient contrast may be output under insufficient light conditions. Such images The quality is not high, especially in the field of security monitoring. If the quality of the output image is not ideal, it will be difficult to identify important information in the image and reduce the accuracy of monitoring. [0003] see figure 1 , is a structural diagram of a device for optimizing LCD display contrast in the prior art, the de...

Claims

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Application Information

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IPC IPC(8): H04N5/232H04N9/73
CPCH04N5/243H04N5/2351H04N5/57H04N23/76H04N23/71
Inventor 范蒙陈军贾永华胡扬忠邬伟琪
Owner HANGZHOU HIKVISION DIGITAL TECH
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