Laser & Optoelectronics Progress, Volume. 58, Issue 18, 1811027(2021)
High-Resolution Imaging Technology for Large F-Numbers Based on Pixel Coding
To realize small-aperture cameras with the same resolving power as large-aperture cameras, a high-resolution imaging technology based on pixel coding is proposed. To reduce image aliasing at high and low frequencies, a pixel coding algorithm based on the system point spread function as the computing core is proposed. First, the encoding matrix of the system is directly constructed in the spatial domain. Then, the inversion method is used to decode the output image for enhanced image quality. Finally, the imaging system with a focal length of 100 mm and a pixel size of 9 μm is developed. The F-numbers of 11 (F11) and 25 (F25) are used for indoor experimental verification. The pixel coding algorithm is used to correct the image of distinguish plate obtained using the F25 system. The value of the corrected modulation transfer function (0.18) is equivalent to that obtained using the F11 system(0.24), and high image contrast is obtained. The experimental results verify the feasibility and effectiveness of the pixel coding algorithm, thereby allowing small-aperture cameras to achieve high-resolution imaging.
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Qiusha Shan, Wei Hao, Zhaohui Liu, Liang Zhou, Rongli Chen. High-Resolution Imaging Technology for Large F-Numbers Based on Pixel Coding[J]. Laser & Optoelectronics Progress, 2021, 58(18): 1811027
Category: Imaging Systems
Received: May. 31, 2021
Accepted: Jul. 28, 2021
Published Online: Sep. 3, 2021
The Author Email: Shan Qiusha (shqsh.2007@163.com), Liu Zhaohui (lzh@opt.ac.cn)