A novel technique for acquiring time-sequential images during a frame-capture period of an ordinary CMOS image sensor using a multi-lens optical system is proposed. In addition, this system is utilized for high-speed three-dimensional measurement based on a spatial encoding method. In the proposed image capturing system, multiple lenses are rhomboidally arranged on a CMOS image sensor to detect multiple images for one object. Because pixel values in the CMOS image sensor are obtained sequentially, we can obtain multiple images that are captured at different timing. In the spatial encoding method, several kinds of optical patterns are projected to a measured object. It is possible to obtain multiple images in which different patterns are projected to the object within one frame period by dividing the captured images and reconstruct images from rearrange the parts of image. The principle of the proposed method was verified by three-dimensional measurement with a CMOS compound-eye image capturing. The size of the three-dimensional image was 360 x 270 pixel, and the number of steps of distance was 64, and the measurement time was 1/15 seconds.

Date Published: 27 January 2009
PDF: 8 pages
Proc. SPIE 7249, Sensors, Cameras, and Systems for Industrial/Scientific Applications X, 72490T (27 January 2009); doi: 10.1117/12.807189

Published in SPIE Proceedings Vol. 7249:
Sensors, Cameras, and Systems for Industrial/Scientific Applications X
Erik Bodegom; Valérie Nguyen, Editor(s)