Abstract

We propose an optical-scanning-based imaging system, useful for directly acquiring the directional gradient and/or the Laplacian of an image. Such operations are crucial in edge detection, edge enhancement, and feature extraction. Digital edge-detection techniques tend to be computationally intensive as well as noise sensitive, as these derivative-based operators essentially constitute high-pass filters. Since we employ synchronous temporal detection to detect gradients in a direct fashion, noise suppression is greatly enhanced. Proof-of-principle results demonstrate the feasibility of our technique.

© 1992 Optical Society of America

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