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Underwater color image enhancement method based on dark channel theory

A technology for dark channel images and color images, which is applied in image enhancement, image analysis, image data processing, etc., and can solve problems such as saturation reduction, blurring, and contrast reduction

Active Publication Date: 2017-07-28
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose an effective method for underwater color images, especially near-shore underwater color images, which have degradation factors such as absorption and scattering, blurring, contrast reduction, saturation reduction, and non-uniform color projection. The underwater color image enhancement method based on dark channel theory can effectively enhance the clarity, contrast and color of underwater color images

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  • Underwater color image enhancement method based on dark channel theory
  • Underwater color image enhancement method based on dark channel theory
  • Underwater color image enhancement method based on dark channel theory

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Embodiment 1

[0082] Embodiment 1, an underwater color image enhancement method based on dark channel theory, the method steps are as follows: for underwater degraded images, on the basis of the Jaffe-McGlamery imaging model, use the Retinex method to estimate the transmission map for dark channel images, and then Using the local scattering background light estimation method fitted by Poisson distribution, the pixel value of the underwater color image corresponding to the pixel point closest to the estimated value in the dark channel image block is used as the backscattering background light of the image block. After obtaining the restored image , apply contrast stretching for color enhancement, and finally obtain the enhanced underwater image output.

[0083] For a R, G, B space normalized underwater color image I∈(0,1), the specific method steps are as follows:

[0084] In the first step, for the underwater imaging model formula (1), use formula (3) to calculate the dark channel image L ...

Embodiment 2

[0093] Embodiment 2, the performance comparison experiment of the underwater color image enhancement method of the present invention for enhancing image clarity and color:

[0094] In this embodiment, the pool is 2.53 meters long, 1.02 meters wide and 1.03 meters high. The test target is ImatestSFRplus sharpness plate and ColorChecker 24 X-Rite Chart (21.59×27.94cm). OTI-UWC-325 / P / E color cameras were used to take underwater images under the conditions of 94.5cm (Duntley's rule).

[0095] Imatest is a widely used image evaluation software developed by Imatest Company in the United States. Its system is based on Matlab. Imatest is a software package for data testing of digital camera images. This software has many functions, such as: resolution test (SFR--MTF), color difference, color reproduction, color space, etc. It is currently the most Authoritative imaging analysis software.

[0096] Imatest 4.3 image quality evaluation software is used to automatically analyze the und...

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Abstract

The present invention relates to an underwater color image enhancement method based on a dark channel theory. The method concretely comprises the following steps of for an underwater degraded image, on the basis of a Jaffe-McGlamery imaging model, adopting a Retinex method to estimate a transmission diagram of a dark channel image, utilizing a local back scattering background light estimation method of the Poisson distribution fitting to take the underwater color image pixel values corresponding to the pixel points most close to an estimated value in a dark channel image block as the back scattering background light of the image block, after a restored image is obtained, applying the contrast stretch to carry out the color enhancement, and finally obtaining and outputting an enhanced underwater image. The method of the present invention can realize the definition and color enhancement of the underwater image better, and is more suitable for being applied to the underwater image enhancement problem of the coastal waters water body turbidity.

Description

technical field [0001] The invention belongs to the technical field of image processing and analysis, in particular to an underwater color image enhancement method based on dark channel theory for shooting color images in environments with absorption and scattering optical attenuation, such as fog and underwater environments. Background technique [0002] Underwater vision is an important scientific research basis in ocean exploration, marine biological survey, and underwater engineering monitoring. In water, the optical attenuation, scattering and light source illumination of the water body make the underwater images taken have complex degradations such as small visible distance, low contrast, blur, non-uniform lighting, bright spots, color projection and various noises. Therefore, in the application of computer vision methods In various underwater video analysis and image processing applications, the restoration or enhancement of underwater images is a necessary processing...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T2207/10024G06T2207/20172G06T5/92G06T5/73G06T5/70
Inventor 杨淼
Owner HUAIHAI INST OF TECH
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