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Underwater image enhancement method based on low-rank decomposition and fusion

A low-rank decomposition technology for underwater images, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as incomplete fusion of images, loss of image details, etc.

Active Publication Date: 2021-07-30
NINGBO UNIV
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Problems solved by technology

However, ordinary fusion methods cannot perfectly fuse images, usually at the cost of losing image details

Method used

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  • Underwater image enhancement method based on low-rank decomposition and fusion
  • Underwater image enhancement method based on low-rank decomposition and fusion
  • Underwater image enhancement method based on low-rank decomposition and fusion

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Embodiment Construction

[0052] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0053] An underwater image enhancement method based on low-rank decomposition and fusion proposed by the present invention, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:

[0054] Step 1: Record the R channel, G channel and B channel of the underwater image as {I R (i,j)}, {I G (i,j)} and {I B (i,j)}; then use the channel compensation method to {I R The pixel value of each pixel in (i, j)} is compensated, and the R channel after compensation is obtained, which is denoted as {I RC (i,j)}; pair {i G The pixel value of each pixel in (i, j)} is not compensated; for {I B (i, j)}, if the human eye subjectively judges that the underwater image is obviously greenish, then for {I B The pixel value of each pixel point in (i, j)} is compensated, and the B channel after compensation is obtain...

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Abstract

The invention discloses an underwater image enhancement method based on low-rank decomposition and fusion. The method comprises the following steps: firstly, obtaining an underwater image after color correction; processing the underwater image after color correction, adopting a gamma correction method to obtain a high-contrast image, and performing a normalized non-sharpening masking method to obtain a detail-highlighted image; performing low-rank decomposition on respective L channels of the high-contrast image and the detail highlighting image to obtain respective first-layer base layer images and first-layer detail layer images, and then obtaining respective second-layer base layer images and second-layer detail layer images; performing simple weighted fusion on the second-layer base layer image, fusing the first-layer detail layer image by adopting a nuclear norm, and fusing the second-layer detail layer image; summing the three fusion results to obtain an L channel, and combining the mean values of the a channel and the b channel to obtain an enhanced result image. The method has the advantages that fusion can be performed under the condition that a large number of image details are reserved, and subjective perception and objective evaluation scores of a fusion result can be improved.

Description

technical field [0001] The invention relates to an underwater image enhancement method, in particular to an underwater image enhancement method based on low-rank decomposition and fusion. Background technique [0002] Underwater vision is one of the most basic parts of marine scientific research and marine engineering, such as underwater imaging technology, which helps seabed exploration to study marine biology and inspect geological environments. In addition, autonomous underwater vehicles (AUVs) also It can rely on underwater vision to control itself under complex conditions. However, underwater imaging is affected by light attenuation and scattered light, as well as low-end optical imaging equipment, which can cause various problems in the final imaging result. For example, light attenuation leads to weak light intensity in underwater images and introduces color shifts, while ambient scattered light causes the appearance of the scene to be blurred, so underwater images o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50G06T5/00
CPCG06T5/50G06T2207/20221G06T5/94Y02A90/30
Inventor 姜求平康耀祖邵枫
Owner NINGBO UNIV
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