Ms. Xiaoyu Ma Profile

Xiaoyu Ma

at Xi'an Institute of Optics and Precision Mechanics of CAS

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Proceedings Article | 18 December 2019 Paper

Auto-focus algorithm based on improved SML evaluation function

Xiaoyu Ma, Qiaoling Li

Proceedings Volume 11338, 113381Z (2019) https://doi.org/10.1117/12.2545624

KEYWORDS: Image processing, Imaging systems, Optical imaging, Image quality, Image analysis, Optical transfer functions, Point spread functions, Precision optics

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The traditional spatial domain sharpness evaluation functions usually have a larger amount of calculation, and the calculation time is relatively longer. Besides, its anti-noise ability is weak, and it is easy to be disturbed by the background factors in the image. The above problems will have an impact on the real-time, sensitivity and reliability of the auto-focus system. In order to overcome these shortcomings, an improved SML sharpness evaluation function combined with threshold is proposed in this paper. This algorithm improve the SML function firstly, and make full use of the edge information of the image. Then a threshold is introduced to distinguish the edge points from non-edge points. So it can not only highlight the edge information while restraining the noise and the flat area in the background of the image, but also can reduce the calculation amount of the evaluation function and improve the real-time performance of the auto-focusing system. Finally verifies the effect of the improved evaluation function based on the simulation experiments. The results show that the algorithm proposed in this paper has better sensitivity and anti-noise ability, and can evaluate the sharpness of defocused images accurately and steadily.

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