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Underwater image enhancement method based on adaptive histogram stretching of different color spaces

A technique of histogram stretching and color space, applied in image enhancement, image analysis, image data processing, etc.

Active Publication Date: 2017-12-22
SHANGHAI OCEAN UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to provide an underwater image enhancement based on different color space adaptive histogram stretching in view of the existing problems in the effectiveness, real-time and robustness of image enhancement and restoration. method, making the enhanced underwater image present high contrast, balanced saturation and brightness

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  • Underwater image enhancement method based on adaptive histogram stretching of different color spaces
  • Underwater image enhancement method based on adaptive histogram stretching of different color spaces
  • Underwater image enhancement method based on adaptive histogram stretching of different color spaces

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Embodiment Construction

[0102] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0103] Please refer to figure 1 , figure 1 It is a flowchart of an underwater image enhancement method based on different color space adaptive histogram stretching of the present invention. An underwater image enhancement method based on different color space adaptive histogram stretching, the method comprises the following steps:

[0104] Step S1, perform simple color equalization on the GB channel based on the conjecture of the grayscale world

[0105] ((R avg +G avg +B avg )) / 3=0.5(1)

[0106] where R avg ,G avg ,B avg Denote the normalized mean of red, green and blue, respectively.

[0107]

[0108] According to the GW conjecture theory, the G-B color channel is corrected. Because the red light in water is difficult to compensate by simple color equalization, the red channel is not used as a correction object. I...

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Abstract

The invention relates to an underwater image enhancement method based on the adaptive histogram stretching of different color spaces, and the method comprises the steps: carrying out the equalizing of GB channels based on the Gray-World theory, and initially obtaining an adjusted underwater image; analyzing the distribution features of the RGB channels of the underwater image and the attenuation conditions of RGB channels during propagation in water, proposing an adaptive histogram stretching method in an RGB color space based on the automatic parameter obtaining, and employing a bilateral filter for the three channels so as to reduce the impact from noise; converting the RGB color space into a CIE-Lab color space, and carrying out the adaptive histogram stretching of the three components 'L', 'a', and 'b'; finally and enabling the enhanced underwater image to be high in in contrast, to be balanced in saturation and to be high in brightness. The method is lower in calculation complexity of image enhancement, and is mainly suitable for various types of underwater images, such as the images of underwater creatures, underwater fishing and target detection.

Description

technical field [0001] The invention relates to the technical field of underwater image enhancement, in particular to an underwater image enhancement method based on adaptive histogram stretching in different color spaces. Background technique [0002] The sea world contains a large amount of resources. Under the problems of land population explosion, resource depletion, and environmental degradation, developing and protecting the ocean is an important and strategic choice. The theory and practice of the transmission, acquisition and processing of marine information have played a key role in the rational development and protection of marine ecology, marine resources, and marine diversity. [0003] Underwater images are an important carrier of marine information. However, compared with images in natural environments, underwater images have more complex imaging principles, low contrast, and poor visibility. These factors have hindered the research on marine ecology, marine re...

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Application Information

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IPC IPC(8): G06T5/00G06T5/40G06T7/90
CPCG06T5/40G06T7/90G06T2207/20028G06T5/70
Inventor 黄冬梅宋巍王龑王振华贺琪杜艳玲
Owner SHANGHAI OCEAN UNIV
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