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New understanding on the effects of angle and position of biprism on single-lens biprism stereovision system

[+] Author Affiliations
Wei Loon Kee

National University of Singapore, EA 04-06, Department of Mechanical Engineering, Control and Mechatronics Laboratory, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Kah Bin Lim

National University of Singapore, EA 04-06, Department of Mechanical Engineering, Control and Mechatronics Laboratory, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Zeya Lwin Tun

National University of Singapore, EA 04-06, Department of Mechanical Engineering, Control and Mechatronics Laboratory, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Bai Yading

National University of Singapore, EA 04-06, Department of Mechanical Engineering, Control and Mechatronics Laboratory, 10 Kent Ridge Crescent, Singapore 119260, Singapore

J. Electron. Imaging. 23(3), 033005 (May 14, 2014). doi:10.1117/1.JEI.23.3.033005
History: Received November 28, 2013; Revised April 14, 2014; Accepted April 22, 2014
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Abstract.  This paper provides a comprehensive study on the effect of the biprism angle and position on the field-of-view (FOV) of a single-lens biprism-based stereovision system. The image captured by this system consists of subimages that are regarded as virtual images taken by two virtual cameras. The overlapping area in a stereo-image pair constitutes the common FOV. Stereo-correspondence is only possible for objects placed in this common FOV region. A geometrical analysis of this system by tracing the rays enables an enhanced understanding of the system, both qualitatively and quantitatively. First of all, a simple geometrical approach is proposed to predict the type of FOV produced given a fixed biprism angle, α. A dimensionless coefficient, ε, is proposed to describe the different types of FOV. Second, the effect of the translation of biprism in the z- and x-axes on the system’s FOV can also be determined using geometrical analysis. Experiments are conducted to verify the above predictions. Although there are some degrees of quantitative error between the experimental results and theory, the general theoretical trends are largely supported by the results.

© 2014 SPIE and IS&T

Topics

Cameras ; Lenses

Citation

Wei Loon Kee ; Kah Bin Lim ; Zeya Lwin Tun and Bai Yading
"New understanding on the effects of angle and position of biprism on single-lens biprism stereovision system", J. Electron. Imaging. 23(3), 033005 (May 14, 2014). ; http://dx.doi.org/10.1117/1.JEI.23.3.033005


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