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Image contrast enhancement method and apparatus

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

Active Publication Date: 2016-02-17
SHANGHAI BEIZHUO INTELLIGENT TECH CO LTD
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  • Summary
  • 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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  • Image contrast enhancement method and apparatus
  • Image contrast enhancement method and apparatus
  • Image contrast enhancement method and apparatus

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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

The invention discloses an image contrast enhancement method and apparatus. According to the method and apparatus, after a current image Pt is converted into a YUV format, analyzing is respectively carried out according to different features of an image bright area and a dark area so as to generate two brightness index tables through obtaining an average brightness compensation value of the current image PT and segmenting a histogram of a brightness component of the current image Pt, accordingly, the two brightness index tables are spliced according to a size sequence of brightness values to generate a total brightness index table, a chroma index table is generated according to the brightness index table, and the brightness component of the image is effectively corrected and compensated through the generated total brightness index table, such that the contrast scope of the image is dynamically expanded, local details can be salient, and an incorrect dynamic scope of the image is avoided. Since a chroma component is also correspondingly compensated according to the generated chroma index table, self-tone and saturation of the image can be maintained without distortion to the maximum degree.

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 Applications(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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