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Rapid microscope auto-focus method for uneven surfaces based on image fusion
Min-Shan Jiang1, Ting Yang1, Xiao-Li Xu1
1Shanghai Key Laboratory of Contemporary Optics System, College of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China.
Abstract:
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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