自適應(yīng)色彩補(bǔ)償和多尺度融合的水下圖像增強(qiáng)

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Adaptive color compensation and multi-scale fusion for underwater image enhancement

LIU Cuiyin1*，CHEN Yuanshuai1，JING Tengyun 1， WANG Feng

（1. School of Information Engineering and Automation， Kunming University of Science and Technology，Kunming 65O5OO，China; 2. School ofPhysics and Material Sciences， Guangzhou University， Guangzhou 5lOoO6，China） *Corresponding author， E -mail： liucuiyin@kust. edu

Abstract：To address the challenges of color distortion，uneven lighting，low contrast，and blurred details in underwater images，an adaptive color compensation and multi-scale fusion enhancement algorithm is proposed. Initially，adaptive color compensation and white light balance algorithms are employed to correct the image colors. Subsequently，adaptive gamma correction is applied to the color-corrected images to achieve uniform illumination. Thereafter，the uniformly lit images undergo processing through adaptive Rayleigh histogram stretching and adaptive unsharp masking to enhance contrast and detail. Finaly， nondownsampling contour wave fusion is utilized to further refine the quality of the images with improved contrast and enhanced details.Experimental results demonstrate that the proposed algorithm effectively corrects the colors of underwater images and significantly enhances their contrast and clarity，with average evaluation metrics PSNR，SSIM，IE，and UCIQE showing increases of 43.52% ， 58.65% ， 12.5% ， and 32.13% ，respectively，compared to the original images. This algorithm is shown to substantially improve underwater image quality.

Key words： image enhancement; image fusion；color compensation;white balance； Gamma correction; Rayleigh distribution；unsharpened mask；nonsubsampled contourlet transform

1引言

水下圖像可以直觀地獲得海底信息，廣泛應(yīng)用于水中目標(biāo)偵察、探測和識別、水下考古、生物研究、水下工程安裝和檢修等領(lǐng)域。（剩余17545字）