Adaptive focusing method based on depth-of-field estimation

Ninghui Pan; Zhiyong Zhang; Tingyu Zhao; Feihong Yu

doi:10.1117/12.3039079

13 September 2024 Adaptive focusing method based on depth-of-field estimation

Ninghui Pan, Zhiyong Zhang, Tingyu Zhao, Feihong Yu

Author Affiliations +

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 132541B (2024) https://doi.org/10.1117/12.3039079
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

Aiming at the autofocus requirements of lenses with variable aperture and focal length, this paper proposes an autofocus method based on depth-of-field estimation to adaptively calculate the search step length and adjust the focusing region. First, based on the relationship between the focus curve broadening and the existence of depth-of-focus, the search step size during coarse focusing is adaptively calculated by depth-of-focus estimation, so that the motor quickly approaches the focusing peak. Second, using the clarity data obtained during the adaptive step-size search, the direction of object space extension can be estimated, so that focusing region optimization can be performed to improve the peak shift of the focus curve in the state of small depth-of-field. Finally, the hill-climbing search method with small step length is used to realize accurate focusing. Experiments show that compared with the traditional hill-climbing search methods and the coarse-to-fine search methods, this method can reduce the number of focus searches by about 35% through adaptive focusing method, thus speeding up the focusing speed, and can improve the focusing reliability in the case of small depth-of-field through region optimization.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ninghui Pan, Zhiyong Zhang, Tingyu Zhao, and Feihong Yu "Adaptive focusing method based on depth-of-field estimation", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 132541B (13 September 2024); https://doi.org/10.1117/12.3039079

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KEYWORDS

Depth of field

Mathematical optimization

Image analysis

Image processing

Lenses

Digital image processing

Cameras

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