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Proceedings Paper

LC-lens array with light field algorithm for 3D biomedical applications
Author(s): Yi-Pai Huang; Po-Yuan Hsieh; Amir Hassanfiroozi; Manuel Martinez; Bahram Javidi; Chao-Yu Chu; Yun Hsuan; Wen-Chun Chu
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Paper Abstract

In this paper, liquid crystal lens (LC-lens) array was utilized in 3D bio-medical applications including 3D endoscope and light field microscope. Comparing with conventional plastic lens array, which was usually placed in 3D endoscope or light field microscope system to record image disparity, our LC-lens array has higher flexibility of electrically changing its focal length. By using LC-lens array, the working distance and image quality of 3D endoscope and microscope could be enhanced. Furthermore, the 2D/3D switching ability could be achieved if we turn off/on the electrical power on LClens array. In 3D endoscope case, a hexagonal micro LC-lens array with 350um diameter was placed at the front end of a 1mm diameter endoscope. With applying electric field on LC-lens array, the 3D specimen would be recorded as from seven micro-cameras with different disparity. We could calculate 3D construction of specimen with those micro images. In the other hand, if we turn off the electric field on LC-lens array, the conventional high resolution 2D endoscope image would be recorded. In light field microscope case, the LC-lens array was placed in front of the CMOS sensor. The main purpose of LC-lens array is to extend the refocusing distance of light field microscope, which is usually very narrow in focused light field microscope system, by montaging many light field images sequentially focusing on different depth. With adjusting focal length of LC-lens array from 2.4mm to 2.9mm, the refocusing distance was extended from 1mm to 11.3mm. Moreover, we could use a LC wedge to electrically shift the optics axis and increase the resolution of light field.

Paper Details

Date Published: 7 March 2016
PDF: 6 pages
Proc. SPIE 9769, Emerging Liquid Crystal Technologies XI, 97690F (7 March 2016); doi: 10.1117/12.2217513
Show Author Affiliations
Yi-Pai Huang, National Chiao Tung Univ. (Taiwan)
Po-Yuan Hsieh, National Chiao Tung Univ. (Taiwan)
Amir Hassanfiroozi, National Chiao Tung Univ. (Taiwan)
Manuel Martinez, Univ. de València (Spain)
Bahram Javidi, Univ. of Connecticut (United States)
Chao-Yu Chu, National Chiao Tung Univ. (Taiwan)
Yun Hsuan, National Chiao Tung Univ. (Taiwan)
Wen-Chun Chu, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9769:
Emerging Liquid Crystal Technologies XI
Liang-Chy Chien; Dick J. Broer; Hirotsugu Kikuchi; Nelson V. Tabiryan, Editor(s)

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