1 September 1994 Detection of spatial derivatives of images using spatiotemporal techniques
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Optical Engineering, 33(9), (1994). doi:10.1117/12.178260
Abstract
We describe an optical-scanning-based imaging system for directly acquiring various spatial derivatives of images, using spatiotemporal modulation techniques in conjunction with electronic heterodyne detection. The technique, which in principle may be adapted to a realtime parallel detection scheme, offers the ability to acquire a variety of first-order and higher-order spatial derivatives. In addition, spatial resolution may be dynamically controlled in a simple electronic fashion. We demonstrate detection of first-order (directional gradients) and second-order spatial derivatives. We also discuss an application that utilizes our gradient detection technique, in a closed feedback system, to achieve contouring and tracking of stationary and moving objects. Experimental results are presented.
Mark Storrs, David J. Mehrl, "Detection of spatial derivatives of images using spatiotemporal techniques," Optical Engineering 33(9), (1 September 1994). http://dx.doi.org/10.1117/12.178260
JOURNAL ARTICLE
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KEYWORDS
Transmittance

Binary data

Heterodyning

Clocks

Photodetectors

Optical amplifiers

Spatial resolution

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