Cao J, Cheng Y, Wang P, Zhang K, Xiao Y, Li K, Peng Y, Hao Q. Autofocusing imaging system based on laser ranging and a retina-like sample.
APPLIED OPTICS 2017;
56:6222-6229. [PMID:
29047817 DOI:
10.1364/ao.56.006222]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 07/05/2017] [Indexed: 06/07/2023]
Abstract
A novel autofocusing method combining active and passive techniques is proposed to improve autofocusing performance. The proposed method is divided into coarse and fine autofocusing stages. First, a laser ranging finder viewed as the active technique is used to obtain a reasonable initial position of the compensating lens group during the coarse autofocusing stage. Second, a retina-like sampling method is used to decrease the volume of processing data during the fine autofocusing stage. We developed a prototype and performed comparative experiments using different targets based on the proposed method and the traditional passive method (TPM). Under optical power of 9×, the TPM consumed 2.5 s, while the proposed method performed at 1.3 s. The comparative experiments also showed that the proposed method exhibited a better anti-interference property than the traditional method.
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