Yu Shen, Jianwu Dang, Yangping Wang, Bowei Wang. A Color Underwater Image Clearness Algorithm Based on Tetrolet Transform[J]. Acta Optica Sinica, 2017, 37(9): 0910002
- Acta Optica Sinica
- Vol. 37, Issue 9, 0910002 (2017)
Fig. 1. Flow chart of the proposed algorithm
Fig. 2. Maping underwater color image to lαβ three channels. (a) Original image; (b) l channel; (c) α channel; (d) β channel
Fig. 3. Five basic tetrominoes
Fig. 4. Structure diagram of Tetrolet transformation
Fig. 5. Comparison of high-frequency details. (a) Tetrolet transform; (b) improved Tetrolet transform
Fig. 6. Effects on image edge of bilateral filtering. (a) Image region with noises; (b) value domain filtering; (c) bilateral filtering; (d) spatial domain filtering; e) filtering combination of spatial domain and value domain
Fig. 7. Images before and after Tetrolet processing. (a) Original images; (b) after Tetrolet processing
Fig. 8. Comparison of experiment results. (a) Original images; (b) Retinex method; (c) three-channel method; (d) proposed method
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Table 1. Quantitative results comparison of three methods in Image1
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Table 2. Quantitative results comparison of three methods in Image2
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Table 3. Quantitative results comparison of three methods in Image3
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Table 4. Quantitative results comparison of three methods in Image4
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Table 5. Quantitative results comparison of three methods in Image5
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Table 6. Quantitative results comparison of three methods in Image6
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Table 7. Quantitative results comparison of three methods in Image7
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Table 8. Quantitative results comparison of three methods in Image8
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