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Underwater image enhancement method for optimizing CLAHE

An underwater image and image technology, applied in the field of image processing, can solve the problems of limited effect improvement, increased calculation amount, low brightness, etc., to achieve the effect of reducing performance requirements, avoiding large noise, and obvious detail features.

Active Publication Date: 2019-12-20
NANJING INST OF TECH
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Problems solved by technology

[0004] Using the linear contrast stretching method, the effect is not ideal when the brightness of the underwater image is low and the details are distributed in a narrow gray scale interval; the single use of the HE method has limited enhancement of the local details of the image; only the original CLAHE parameters are used, It is not suitable for underwater image processing; the brightness and saturation components of the image are processed again, which increases the amount of calculation and the effect is limited.

Method used

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  • Underwater image enhancement method for optimizing CLAHE
  • Underwater image enhancement method for optimizing CLAHE

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Embodiment Construction

[0038] like figure 1 As shown, an underwater image enhancement method for optimizing CLAHE includes the following steps:

[0039] (1) Pretreatment process;

[0040] (2) HE treatment process;

[0041] (3) The adjusted CLAHE process;

[0042] (4) The image is synthesized again, and the enhanced image is output.

[0043] like figure 2 As shown, in step (1), the preprocessing process is specifically: compressing the collected underwater image, the compressed image can reduce the amount of calculation in the subsequent image enhancement algorithm on the basis of retaining the original image information; image compression The bicubic interpolation method is used in the process, which destroys less information on the original image and has a moderate speed; the image is divided into three channels of RGB, and common color images are stored in RGB format, and the information of the three channels is stored in the memory as a continuous matrix. The RGB channel can be directly rea...

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Abstract

The invention discloses an underwater image enhancement method for optimizing CLAHE. The method comprises the following steps: (1) a preprocessing process; (2) an HE treatment process; (3) an adjustedCLAHE treatment process; and (4) image re-synthesis, and enhanced image output. According to the method, core parameters in a traditional CLAHE algorithm are optimized, so that the method is more suitable for an application scene of underwater image enhancement. The HE algorithm and the CLAHE algorithm are used in a mixed mode, the overall color of the image is recovered, detail features are moreobvious, and the phenomenon that noise points are large due to the AHE algorithm is avoided. The algorithm does not depend on a complex mathematical model, does not use a huge algorithm, is small incalculation amount, does not need training, is quick in execution, reduces the requirements for the performance of a processor, and is suitable for the transplantation and implementation of various types of underwater embedded platforms.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an underwater image enhancement method for optimizing CLAHE. Background technique [0002] At this stage, countries are gradually paying attention to the development of marine resources. Because human beings are not adapted to the underwater environment, collecting and analyzing underwater images and videos by underwater robots is one of the important ways to explore and develop underwater. Due to the optical characteristics of the water body itself and the influence of suspended impurities in the water, the light will be seriously absorbed and scattered in the water, which will eventually lead to the decrease of the contrast, color shift, and blurred details of the actually collected images, and degraded underwater images for researchers The analysis of the underwater environment brings great difficulties, so how to enhance the details of the underwater image and resto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T3/40
CPCG06T3/4023G06T5/92Y02A90/30
Inventor 史学超陈巍王子阳陶毅
Owner NANJING INST OF TECH
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