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Proceedings Paper

Image synchronization for 3D application using the NanEye sensor
Author(s): Ricardo M. Sousa; Martin Wäny; Pedro Santos; Morgado Dias
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Paper Abstract

Based on Awaiba’s NanEye CMOS image sensor family and a FPGA platform with USB3 interface, the aim of this paper is to demonstrate a novel technique to perfectly synchronize up to 8 individual self-timed cameras. Minimal form factor self-timed camera modules of 1 mm x 1 mm or smaller do not generally allow external synchronization. However, for stereo vision or 3D reconstruction with multiple cameras as well as for applications requiring pulsed illumination it is required to synchronize multiple cameras. In this work, the challenge to synchronize multiple self-timed cameras with only 4 wire interface has been solved by adaptively regulating the power supply for each of the cameras to synchronize their frame rate and frame phase. To that effect, a control core was created to constantly monitor the operating frequency of each camera by measuring the line period in each frame based on a well-defined sampling signal. The frequency is adjusted by varying the voltage level applied to the sensor based on the error between the measured line period and the desired line period. To ensure phase synchronization between frames of multiple cameras, a Master-Slave interface was implemented. A single camera is defined as the Master entity, with its operating frequency being controlled directly through a PC based interface. The remaining cameras are setup in Slave mode and are interfaced directly with the Master camera control module. This enables the remaining cameras to monitor its line and frame period and adjust their own to achieve phase and frequency synchronization. The result of this work will allow the realization of smaller than 3mm diameter 3D stereo vision equipment in medical endoscopic context, such as endoscopic surgical robotic or micro invasive surgery.

Paper Details

Date Published: 2 March 2015
PDF: 14 pages
Proc. SPIE 9304, Endoscopic Microscopy X; and Optical Techniques in Pulmonary Medicine II, 93041N (2 March 2015); doi: 10.1117/12.2078271
Show Author Affiliations
Ricardo M. Sousa, Univ. da Madeira (Portugal)
AWAIBA Lda. (Portugal)
Martin Wäny, AWAIBA Lda. (Portugal)
Pedro Santos, AWAIBA Lda. (Portugal)
Morgado Dias, Univ. da Madeira (Portugal)
Madeira Interactive Technologies Institute (Portugal)

Published in SPIE Proceedings Vol. 9304:
Endoscopic Microscopy X; and Optical Techniques in Pulmonary Medicine II
Melissa J. Suter; Guillermo J. Tearney M.D.; Thomas D. Wang; Stephen Lam M.D.; Matthew Brenner, Editor(s)

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