Study of active millimeter-wave image speckle reduction by Hadamard phase pattern illumination |
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| Authors: | Koers Gaetan Ocket Ilja Feng Qi Tavakol Vahid Jäger Irina Nauwelaers Bart Stiens Johan |
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| Affiliation: | Lab for Microelectronics and Photonelectronics, Electronics and Information Processing Department, Vrije Universiteit Brussel, Brussels, Belgium. gkoers@etro.vub.ac.be |
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| Abstract: | Active millimeter-wave images typically exhibit characteristic speckle noise, due to the coherence of artificial millimeter-wave sources. We 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 show the impact of Hadamard pattern order and size and of image and pattern resolution on speckle reduction efficiency. Practical limitations of Hadamard pattern implementations and their effect on speckle reduction efficiency are also discussed. |
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