Underwater image enhancement processing method

An underwater image and enhancement processing technology, applied in the field of image processing, can solve problems such as poor underwater image quality

Inactive Publication Date: 2014-03-26
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0017] In order to solve the problem of poor underwater image quality, the

Method used

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Embodiment Construction

[0040] Histogram equalization, median filtering, peak signal-to-noise ratio (PSNR) and mean square error (MSE) of the method of the present invention are shown in the following table.

[0041] Table: Comparison of evaluation indicators after processing underwater images by image enhancement processing methods

[0042] Image Enhancement Processing Method

PSNR(dB)

MSE

Histogram equalization

7.5160

1.1521e+004

median filter

31.2067

17.8171

The method of the invention

50.0167

0.7365

[0043] By analyzing the characteristics of underwater images, different filtering methods are adopted to deal with the characteristics of underwater images such as uneven illumination, low contrast, and fuzzy details.

[0044] Compare figure 2 , image 3 , Figure 4 with Figure 5, and the data in the above table, it can be seen that the uniformity of the illumination of the image is improved by using homomorphic filtering for ...

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Abstract

The invention discloses an underwater image enhancement processing method which combines a homomorphic filtering method with a biorthogonal wavelet threshold filtering method. The underwater image enhancement processing method mainly includes the following steps: A), performing logarithm operation on an original image acquired underwater to acquire Z (x,y); B), performing discrete Fourier transformation on Z (x,y) to acquire Z (u,v); C), performing homomorphic filtering processing on Z (u,v) to acquire S (u,v); D), performing Fourier inversion on S (u,v) to acquire s (x,y); E),performing exponent operation on s (x,y) to acquire a processed image g (x,y); F), applying the biorthogonal wavelet threshold filtering method to process the image. By the underwater image enhancement processing method, noise of the image can be removed, contrast ratio of the image is increased, illumination uniformity of a processed underwater image is improved, both balanced filtering and median filtering of a peak signal to noise ratio (PSNR) histogram are improved, underwater image quality is improved, and the underwater image enhancement processing method has certain practical value in improving underwater image quality.

Description

technical field [0001] The invention relates to image processing, in particular to an underwater image enhancement processing method. Background technique [0002] Due to the complexity of the underwater imaging environment, the imaging process is affected by many factors, such as the poor collimation of the light emitted by the auxiliary lighting source, the uneven distribution of light intensity in the shooting scene, and the background brightness and dark distribution of the captured underwater images. have large differences. In addition, due to the absorption and scattering effect of water on light, the light is strongly attenuated when it is transmitted in water, the visibility of the underwater camera environment is low, the details of the obtained underwater images are not clear, and the contrast is low. Although the current mature underwater imaging technology has improved the quality of underwater images to a certain extent, underwater images still have the charact...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 陈名松秦琳康艳梅汤玲利汪永辉
Owner GUILIN UNIV OF ELECTRONIC TECH
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