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White balance and dark primary color adaptive histogram underwater image enhancement method

An underwater image and histogram technology, applied in image enhancement, graphic image conversion, image analysis, etc., can solve problems such as complex calculation process

Inactive Publication Date: 2017-06-27
NANJING 55TH INSTION TECH DEV
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Problems solved by technology

This method has a better algorithm effect, but the calculation process is more complicated

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  • White balance and dark primary color adaptive histogram underwater image enhancement method
  • White balance and dark primary color adaptive histogram underwater image enhancement method
  • White balance and dark primary color adaptive histogram underwater image enhancement method

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Embodiment Construction

[0056] Underwater images are widely used in the fields of marine energy exploration and development, marine archaeology, marine environmental monitoring and protection, etc. However, due to the particularity of the underwater environment, the quality of the acquired images is often poor, making it difficult to use for subsequent image analysis and applications. Aiming at the blurring effect of underwater images caused by the scattering of light by water molecules and water particles, the present invention first performs color correction to eliminate image color cast, and then performs image enhancement, which can not only eliminate image blurring effects, increase image contrast, and enrich images. Detail, so that the image is enhanced and the visual effect is improved. The invention carries out block-limited contrast histogram equalization and contrast stretching enhancement on underwater images, and adds weight factors for fusion. It has good performance in dynamic range and...

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Abstract

The invention relates to the digital image processing field and particularly relates to a white balance and dark primary color adaptive histogram underwater image enhancement method. The method comprises steps that step 1, color correction for an image is carried out through utilizing a dynamic threshold white balance algorithm; step 2, a dark channel map of the image after color correction is solved through utilizing a dark channel model; step 3, a weight factor of block images is calculated; step 4, underwater image processing is carried out through utilizing a CLAHE method; step 5,the weight factor and gray mapping relationship tables are utilized to acquire a final gray mapping relationship table of a block through fusion calculation; and step 6, a bilinear interpolation algorithm is utilized to calculate a gray mapping value corresponding to each pixel in block images one by one, enhanced block images are acquired, interpolation calculation for pixels connected between the adjacent block images is carried out, and images of underwater images after enhancement are acquired. The method has advantages of simple calculation and strong timeliness.

Description

technical field [0001] The invention relates to an underwater image enhancement method in the field of digital image processing, in particular to an adaptive histogram underwater image enhancement method of white balance and dark primary color. Background technique [0002] The ocean is pregnant with great energy and resources, and it is an important field for human survival and development. The development of human society will inevitably rely more and more on the ocean. At present, more and more human activities are related to the ocean. Therefore, the development of underwater image The research on processing methods has important value and significance in both military affairs and national economy. [0003] Underwater image analysis and recognition is one of the key technologies in marine research and development, but in the process of underwater imaging, due to the absorption of light by water bodies and the scattering of light by suspended particles, underwater images ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T3/40
CPCG06T3/4007G06T2207/10024G06T2207/20021G06T5/73G06T5/90
Inventor 程智林
Owner NANJING 55TH INSTION TECH DEV
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