Laser & Optoelectronics Progress, Volume. 58, Issue 14, 1410001(2021)
Low-Illumination Color Image Enhancement System Based on Single Sensor
Figures & Tables(11)
Fig. 1. Sensor spectral sensitivity. (a) SS of RGB+NIR CFA; (b) SS of CMYW CFA; (c) SS of CMYW subtraction
Fig. 3. Experimental environment. (a) Darkroom environment for image acquisition; (b) enlargement of some details
Fig. 4. Comparison of noise reduction effects for different algorithms. (a) Difference; (b) BF; (c) JBF; (d) NLM; (e) INLM; (f) Joint NLM
Fig. 5. First group of images in different environments and images processed by different algorithms. (a) Image without NIR under normal illumination; (b) image without NIR under low illumination; (c) image with NIR under low illumination; (d) low illumination image processed by system in Ref. [11]; (e) low illumination image processed by system in Ref. [14]; (f) low illumination image processed by proposed system
Fig. 6. Second group of images in different environments and images processed by different algorithms. (a) Image without NIR under normal illumination; (b) image without NIR under low illumination; (c) image with NIR under low illumination; (d) low illumination image processed by system in Ref. [11]; (e) low illumination image processed by system in Ref. [14]; (f) low illumination image processed by proposed system
Fig. 7. Third group of images in different environments and images processed by different algorithms. (a) Image without NIR under normal illumination; (b) image without NIR under low illumination; (c) image with NIR under low illumination; (d) low illumination image processed by system in Ref. [11]; (e) low illumination image processed by system in Ref. [14]; (f) low illumination image processed by proposed system
Table 1. PSNR comparison of images processed by different noise reduction algorithms unit: dB
View tableTable 1. PSNR comparison of images processed by different noise reduction algorithms unit: dB
Algorithm R G B Originalimage 18.161 18.125 16.580 Ref.[17] 18.530 18.475 16.657 Ref.[21] 19.171 19.131 17.157 Ref.[22] 19.102 19.064 17.061 Ref.[23] 19.131 19.113 17.126 Ours 19.339 19.284 17.857
Table 2. Brightness mean values comparison of three groups of images
View tableTable 2. Brightness mean values comparison of three groups of images
Image (b) (c) (d) (e) (f) Fig. 5 251.814 267.478 237.167 245.263 267.583 Fig. 6 250.962 266.593 236.281 244.384 266.675 Fig. 7 246.589 264.837 233.893 241.765 264.951
Table 3. Structural similarity comparison of three groups of images
View tableTable 3. Structural similarity comparison of three groups of images
Image (b) (c) (d) (e) (f) Fig. 5 0.701 0.748 0.689 0.732 0.749 Fig. 6 0.702 0.746 0.692 0.731 0.747 Fig. 7 0.698 0.745 0.688 0.730 0.746
Table 4. Comparison of PSNR of three groups of images unit: dB
View tableTable 4. Comparison of PSNR of three groups of images unit: dB
Image (b) (c) (d) (e) (f) Fig. 5 19.780 20.280 19.964 19.256 20.501 Fig. 6 19.653 20.267 19.848 19.249 20.384 Fig. 7 19.421 20.178 19.665 19.158 20.296
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Shikai Jin, Jiangtao Xu, Kaiming Nie. Low-Illumination Color Image Enhancement System Based on Single Sensor[J]. Laser & Optoelectronics Progress, 2021, 58(14): 1410001
Paper Information
Category: Image Processing
Received: Oct. 10, 2020
Accepted: Nov. 14, 2020
Published Online: Jul. 6, 2021
The Author Email: Xu Jiangtao (xujiangtao@tju.edu.cn)
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