基于顏色失真去除與暗通道先驗的水下圖像復原
doi: 10.11999/JEIT150483 cstr: 32379.14.JEIT150483
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1.
(天津大學電子信息工程學院 天津 300072) ②(國家海洋技術(shù)中心 天津 300112)
基金項目:
國家自然科學基金(61372145, 61472274, 61201371)
Underwater Image Restoration Based on Color Cast Removal and Dark Channel Prior
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1.
(School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China)
Funds:
The National Natural Science Foundation of China (61372145, 61472274, 61201371)
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摘要: 水下圖像成像過程與霧天圖像雖然類似，但因水對光的選擇性吸收和光的散射作用，水下圖像存在顏色衰減并呈現(xiàn)藍(綠)色基調(diào)，傳統(tǒng)的去霧方法用于水下圖像復原時效果欠佳。針對這類方法出現(xiàn)的缺點，該文根據(jù)先去除顏色失真后去除背景散射的思路，提出一種新的水下圖像復原方法。結(jié)合光在水中的衰減特性，提出適用于水下圖像的顏色失真去除方法，并利用散射系數(shù)與波長的關(guān)系修正各通道透射率；另外，該文改進的背景光估計方法可有效避免人工光源、白色物體、噪聲等影響。實驗結(jié)果證明，該文方法在恢復場景物體原本顏色和去除背景散射方面效果良好。
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關(guān)鍵詞:
- 無損信息隱藏 /
- 廣義整數(shù)變換 /
- 拓展 /
- 嵌入容量
Abstract: The imaging process of the underwater image is similar to the haze image. However, the dehazing methods fail when used in the underwater image restoration because of the color attenuation and blue (green) color tone, caused by the selective absorption of water and light scattering. Thus, this paper proposes a new approach for underwater images restoration based on the idea of removing backscattering after the color cast removal. Due to the attenuation of light in water, a color cast removal approach is proposed. The relationship between scattering coefficient and wavelength is used to obtain a more accurate transmission estimation for each color channel. In addition, an improved algorithm for background light estimation is presented, which can effectively avoid the influence of artificial light, white object and noise. Experimental results demonstrate the effectiveness of the proposed method in restoring the original color of the scene and removing the backscattering.-
Key words:
- Image processing /
- Color cast /
- Backscattering /
- Dark channel prior
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