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A kind of image contrast enhancement method and device

An image comparison, current image technology, used in image enhancement, image data processing, instrumentation, etc.

Active Publication Date: 2017-11-17
SHANGHAI BEIZHUO INTELLIGENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem solved by the embodiment of the present invention is how to effectively expand the contrast range of the image and highlight the details, and keep the original tone and saturation of the image without distortion to the greatest extent

Method used

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  • A kind of image contrast enhancement method and device
  • A kind of image contrast enhancement method and device
  • A kind of image contrast enhancement method and device

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Embodiment Construction

[0061] Regardless of whether it is a static or dynamic image, or a video image, due to limitations or defects in acquisition, transmission, and display equipment, the contrast of the received and displayed image will not be strong. Image contrast enhancement can cause many problems. For example, the image may be too bright or too dark, and the dynamic range may be inaccurate. It may also cause many details to be concentrated in a relatively narrow gray-scale interval, resulting in unclear details.

[0062] In order to effectively enhance the image contrast, the embodiment of the present invention uses the current image P t Convert to YUV format, count the histogram of its brightness components, and obtain its average brightness compensation value And with the average luminance complement value As a boundary point, the histogram of the luminance component is segmented, a first luminance index table of the first histogram after segmentation and a second luminance index table ...

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Abstract

An image contrast enhancement method and device, the method and device, after converting the current image Pt to the YUV format, obtain the average brightness compensation value of the current image Pt, and segment the histogram of the brightness component of the current image Pt , according to the different characteristics of the bright and dark areas of the image, analyze them separately to generate two brightness index tables, and then splicing the two brightness index tables according to the order of brightness values ​​to generate an overall brightness index table, and according to the brightness The index table generates a chroma index table, and effectively corrects and compensates the luminance component of the image through the generated overall luminance index table, so that the contrast range of the image is dynamically expanded, thereby highlighting local details and avoiding image dynamics. The range is not correct, and since the chroma component is also compensated accordingly according to the generated chroma index table, the original hue and saturation of the image can be kept without distortion to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of digital image and video processing, in particular to an image contrast enhancement method and device. Background technique [0002] In a variety of multimedia processing systems involving display devices, due to limitations or defects in acquisition, transmission and display devices of images and videos, the contrast of the received and displayed images will not be strong, which will lead to incorrect dynamic range and details of the images. unclear phenomena. [0003] Image enhancement is a basic image preprocessing technology, which mainly suppresses useless information by selectively enhancing the useful information of the image. It can enhance the contrast of the image, weaken the noise information to a certain extent, thereby improving the visual effect of the original image, so that the processor can carry out subsequent processing, and its application value has been widely valued. [0004] The cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 刘屹黄鹏成喜民叶健
Owner SHANGHAI BEIZHUO INTELLIGENT TECH CO LTD
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