Image clarity evaluation functions for camera autofocus under various lighting conditions

Qiuyu Zhang; Chao Ma; Shaofei Zang; Pengyang Yu; Jianwei Ma

doi:10.1117/12.3031598

18 July 2024 Image clarity evaluation functions for camera autofocus under various lighting conditions

Qiuyu Zhang, Chao Ma, Shaofei Zang, Pengyang Yu, Jianwei Ma

Proceedings Volume 13179, International Conference on Optics and Machine Vision (ICOMV 2024); 131791A (2024) https://doi.org/10.1117/12.3031598
Event: International Conference on Optics and Machine Vision (ICOMV 2024), 2024, Nanchang, China

Abstract

The multispectral imaging system captures images using multiple different light sources. As the camera focuses on different light sources, the wavelength of the light changes, causing a shift in the focal length of the camera and a corresponding change in the information captured by the image. To address this issue, this paper analyzes other evaluation functions and modifies the Tenengrad function to extract image gradient information from multiple directions. The paper then proposes the SIFTQuad_Tenen image clarity evaluation function, which is combined with the SIFT feature point extraction algorithm. Experiments were conducted using three different light sources: red, green, and blue. The resulting clarity evaluation curves and related indicators were compared with those of other evaluation functions. The results show that the proposed evaluation function has good performance in all three lighting scenarios, as well as better stability and higher sensitivity than other evaluation functions.

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

Citation Download Citation

Qiuyu Zhang, Chao Ma, Shaofei Zang, Pengyang Yu, and Jianwei Ma "Image clarity evaluation functions for camera autofocus under various lighting conditions", Proc. SPIE 13179, International Conference on Optics and Machine Vision (ICOMV 2024), 131791A (18 July 2024); https://doi.org/10.1117/12.3031598

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KEYWORDS

Light sources

Image analysis

Light sources and illumination

Image processing

Feature extraction

Image enhancement

Cameras

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