Surface profiling measurement using varifocal lens based on focus stacking

In this study, we developed a 3D surface profiling technique based on a varifocal lens and focus-stacking method that uses a high-pass filter in conjunction with a focus algorithm. The varifocal lens was used in conjunction with a CCD camera to capture images of samples from various distances. The focus stacking method was then used to construct a surface profile and the image with large depth-of-filed.

[1]  Chih-Yen Chen,et al.  Rapid displacement sensor based on fitting scan , 2016, 2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings.

[2]  Douglas Clark,et al.  A Rapid Image Acquisition Method for Focus Stacking in Microscopy , 2015 .

[3]  Pierre Gouton,et al.  3D Image Acquisition System Based on Shape from Focus Technique , 2013, Sensors.

[4]  Piotr Dudek,et al.  High-speed depth from focus on a programmable vision chip using a focus tunable lens , 2017, 2017 IEEE International Symposium on Circuits and Systems (ISCAS).

[5]  Manuel Aschwanden,et al.  Fast and precise continuous focusing with focus tunable lenses , 2014, OPTO.

[6]  Zhongliang Jing,et al.  Evaluation of focus measures in multi-focus image fusion , 2007, Pattern Recognit. Lett..

[7]  Chih-Yen Chen,et al.  Confocal displacement sensor with varifocal lens , 2015, 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings.

[8]  Bradley J Nelson,et al.  Autofocusing in computer microscopy: Selecting the optimal focus algorithm , 2004, Microscopy research and technique.

[9]  E.I. Perez,et al.  Evaluation of 3D Scanners to Develop Virtual Reality Applications , 2007, Electronics, Robotics and Automotive Mechanics Conference (CERMA 2007).