| Citation: | JIANG Zi-qi, LIU Xiao-mei, CAI Fu-hong, ZHANG Dian, CAI Wei-yu, LIU Hua. Imaging comparison experiment of an underwater imaging system with a semiconductor white laser, a monochromatic laser and an LED white light as the light source[J]. Chinese Optics, 2023, 16(2): 466-478. doi: 10.37188/CO.EN.2022-0012
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To solve the problems of short illumination distance and narrow spectral range in the current underwater detection technology, an underwater semiconductor white laser imaging system was established. The quality of the images captured by the system under different light sources and different conditions was studied. A white laser with a power of 220 mW and a color temperature of 6469 K synthesized by an RGB semiconductor laser is used as the underwater lighting source, which is respectively compared with three RGB monochromatic lasers and an LED white light source under different conditions. For these images, different algorithms are used to process, analyze and evaluate their quality. The results indicate that when the white laser is used as the underwater light source, the collected image is not only better than that with the LED white light source with respect to information detail and structural integrity, but also better than the monochrome laser in color reproduction of the target and the integrity of the edge feature information. The semiconductor white laser has the advantages of concentrated energy, strong color rendering, and high illuminance, and its light source performance can meet the requirements of underwater low-illumination imaging. With the same imaging system and imaging distance, images with stronger authenticity, better texture and more target feature information can be obtained.
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