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Method and device for image processing

An image processing and image technology, applied in the field of image processing, can solve problems such as complex methods, and achieve the effect of simplifying the method, optimizing the effect, and improving the contrast.

Active Publication Date: 2019-02-12
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention provides an image processing method and device to solve the problem in the prior art that the image processing method using histogram equalization is relatively complicated

Method used

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  • Method and device for image processing
  • Method and device for image processing

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Embodiment Construction

[0117] In the embodiment of the present invention, according to the cumulative histogram corresponding to the target area of ​​the image, the statistical probability value corresponding to each gray level in the N-1 gray levels except the maximum gray level is determined, wherein the N is the The number of gray levels of the cumulative histogram, the N is a positive integer greater than 1, and the N is less than the number of gray levels of the image; determine the optimization coefficient corresponding to each statistical probability value, and According to each of the optimization coefficients, an optimization curve corresponding to the optimization coefficient is generated; according to each of the generated optimization curves, and each of the preset N-1 gray levels except the maximum gray level determine the mapping curve corresponding to the target area; determine the pixel points to be processed in the target area, and adjust the pixel values ​​of the pixel points accord...

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Abstract

The invention relates to the field of image processing, and particularly relates to a method and a device for image processing, so as to solve the problem that a method of adopting histogram equalization for image processing in the prior art is inflexible. In the embodiment of the invention, according to a cumulative histogram corresponding to a target area of the image, a statistical probability value corresponding to each gray level in N-1 gray levels except the maximum gray level is determined; an optimization coefficient corresponding to each statistical probability value is determined, and according to each optimization coefficient, an optimization curve corresponding to the optimization coefficient is generated; according to each generated optimization curve and a preset adjustment curve corresponding to each gray level in N-1 gray levels except the maximum gray level, a mapping curve corresponding to the target area is determined; and the pixel value of a pixel point is adjusted according to the mapping curve. Thus, each target area can be independently processed, and the image processing method is more flexible.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image processing method and device. Background technique [0002] At present, when capturing pictures through a video camera or a camera, different image effects will be obtained due to different shooting scenes. For example, taking pictures in scenes with good lighting conditions can obtain better image effects; but taking pictures in scenes such as strong backlighting and strong front lighting often results in dull or dark images with insufficient details and poor image quality. The overall permeability is not enough. [0003] At present, the most common method to improve image contrast is histogram equalization. Among them, the histogram equalization refers to transforming the input image into an output image with approximately the same number of pixels at each gray level through grayscale mapping, that is, the output grayscale histogram is uniform. Meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/40
CPCG06T5/40
Inventor 姜晓涛
Owner ZHEJIANG DAHUA TECH CO LTD