Design of an Accurate Auto-focusing Method by Using Elliptic Optical Apparatus

Wang, Yung-Hsing; Hu, Pin-Hao; Tsai, Meng‐Che; Chen, Chia-Hsu; Lin, Yang-Cheng; Chang, Yu-Hsiu; Horng, Ji-Bin

doi:10.1364/fio.2009.jwc1

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2019

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“…They utilized the inhomogeneous reverse heat equation to estimate the blur at the edge locations and then proposed a graph‐cut‐based method to infer the depth in the scene (Namboodiri & Chaudhuri, ). Wang et al suggested a novel method based on hardware that uses an elliptical mirror to detect the reflected light (Wang et al, ). Because a microscope is a type of optical equipment with an extremely small depth of field, the detection of uneven surfaces is complex.…”

Section: Introductionmentioning

confidence: 99%

Rapid microscope auto‐focus method for uneven surfaces based on image fusion

Jiang

Yang

Xiaoli

et al. 2019

Microscopy Res & Technique

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Microscopic imaging of uneven surfaces is difficult because of the limited depth of field. In this study, we developed a rapid auto‐focus method for uneven surfaces based on image fusion. The Prewitt operator was used to detect the vertical edges of the images. Then, the focus position was theoretically calculated using a Gaussian function, and image fusion was applied to obtain the final in‐focus image. An experiment was designed to verify the developed method. The results revealed that this method is effective for printed circuit boards.

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Section: Introductionmentioning

confidence: 99%