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Study of Active Millimeter Wave Image Speckle Reduction by Hadamard Phase Pattern Illumination This publication appears in: Journal of the Optical Society of America A: Optics and Image Science, and Vision Authors: G. Koers, I. Ocket, Q. Feng, V. Tavakol, I. Jäger, B. Nauwelaers and J. Stiens Volume: 25 Pages: 312-317 Publication Date: Feb. 2008
Abstract: Active millimeter wave images typically exhibit characteristic speckle noise, due to the coherence of artificial millimeter wave sources. In this paper we will study the Hadamard speckle contrast reduction (SCR) technique, which has been successfully used in laser projection systems, in the context of millimeter wave imaging. We will show the impact of Hadamard matrix order and pattern size, linked to image and pattern resolution on speckle reduction efficiency. Practical limitations of Hadamard pattern implementations and their effect on speckle reduction efficiency will also be discussed. External Link.
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