Underwater image enhancement based on red channel weighted compensation and gamma correction model

[in Chinese]; [in Chinese]; [in Chinese]; [in Chinese]; [in Chinese]

doi:10.29026/oea.2018.180024

Opto-Electronic Advances, Volume. 1, Issue 10, 180024(2018)

Underwater image enhancement based on red channel weighted compensation and gamma correction model

[in Chinese]^1,2,3,4, [in Chinese]^1,2、*, [in Chinese]^1,2, [in Chinese]², and [in Chinese]⁴

Author Affiliations

¹Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China

²Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China

³University of Chinese Academy of Sciences, Beijing 100049, China

⁴Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China

show less

Figures & Tables(15)

Fig. 1. Light absorption at different wavelengths underwater.

Download full size

View in Article

Fig. 2. The sample images.

Download full size

View in Article

Fig. 3. RGB channels and corresponding histogram distribution. (a) Original image. (b) R channel. (c) G channel. (d) B channel. (e) Histogram distribution of R. (f) Histogram distribution of G. (g) Histogram distribution of B.

Download full size

View in Article

Fig. 4. (a) Underwater image. (b) Estimated theoretical value in red rectangle. (c) RGB color cube.

Download full size

View in Article

Fig. 5. (a) Original image. (b) Red channel after compensation. (c) Red channel after guided filtering. (d) New RGB image.

Download full size

View in Article

Fig. 6. (a) Histogram. (b) Cumulative histogram.

Download full size

View in Article

Fig. 7. Gamma correction curve.

Download full size

View in Article

Fig. 8. Algorithm flow. (a) Original image. (b) After compensation. (c) γ =0.8.

Download full size

View in Article

Fig. 9. (a) Original image. (b) γ =0.3. (c) γ =0.6. (d) γ =0.9. (e) γ =1.2. (f) γ =1.5.

Download full size

View in Article

Fig. 10. Comparison of different methods. (a) Original images. (b) DCP. (c) Histogram equalization. (d) Gray World. (e) UCM. (f) Our results.

Download full size

View in Article

Fig. 11. Comparison of different methods of actual underwater images. (a) Original images. (b) Histogram equalization. (c) UDCP. (d) Gray World. (e) UCM. (f) Our result.

Download full size

View in Article

Fig. 12. Video restoration by proposed algorithm.

Download full size

View in Article

Table 1. The entropy of images.

View table

View in Article

Table 1. The entropy of images.

Images	Original image	Histogram equalization	UDCP	Gray World	UCM	Proposed algorithm
Example 1	6.0591	7.3843	5.6661	5.2953	6.7993	7.6016
Example 2	6.2642	7.4076	6.0231	5.5167	6.8102	7.6598
Example 3	6.8983	7.3646	6.3745	6.0943	6.6168	7.7037
Example 4	6.6593	7.3714	6.2255	5.9450	6.7546	7.7170
Example 5	6.7107	7.3956	6.3283	5.9642	6.7796	7.7500

Table 2. The contrast of images.

View table

View in Article

Table 2. The contrast of images.

Images	Original image	Histogram equalization	UDCP	Gray World	UCM	Proposed algorithm
Example 1	0.5296	1.6113	0.0034	0.6198	0.7179	1.2163
Example 2	0.6092	1.1637	0.0036	0.7238	0.9214	1.3514
Example 3	0.7225	1.4438	0.0038	0.8002	1.1921	1.4655
Example 4	1.0048	1.9396	0.0056	1.2923	1.4122	1.9548
Example 5	0.9635	1.7528	0.0054	1.1069	1.3013	1.8473

Table 3. Calculation time for different resolutions.
View table
View in Article
Table 3. Calculation time for different resolutions.
Resolution Time/ms Speedup ratio
CPU CUDA
640×480 324.34 11.15 29.09
720×540 381.65 11.60 32.90
1080×720 1112.09 21.79 51.04
1280×810 1547.45 35.01 44.20

Tools

Get Citation

Copy Citation Text

[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Underwater image enhancement based on red channel weighted compensation and gamma correction model[J]. Opto-Electronic Advances, 2018, 1(10): 180024

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites