We proposed a technique for camera autofocusing, that uses single-pixel imaging. Mathematical background of the method is formed by the theory of image moments. The hardware implementation employs the image modulation by a digital micromirror device (DMD) and the measurement by a single-pixel detector. The algorithm searches for the minimum value of polynomially-modulated images. It is fast and robust to noise. We designed an experimental hardware and verified the feasibility of this concept.

The principle of single-pixel imaging. The light (image) passes through the lens, is modulated by the DMD, and is reflected and measured as a single value by a detector.

The experimental device we developed in this project. It is used to testing of the proposed autofocusation method.

Contact person: Jan Flusser

Related Publication:

Huiling Chen, Dongfeng Shi, Zijun Guo, Runbo Jiang, Linbin Zha, Yingjian Wang, Flusser  J.: Fast Autofocusing Based on Single-pixel Moment Detection, Communications Engineering, vol. 3,  Art. No. 140, pp. 1-15, 2024, DOI: 10.1038/s44172-024-00288-z [2024]