Proximity sensing with wavelet-generated video

[+] Author Affiliations
Steven E. Noel

University of Southwestern Louisiana, The Center for Advanced Computer Studies, Lafayette, Louisiana?70504

Harold H. Szu

Naval Surface Warfare Center Dahlgren Division, Systems Research and Technology Department, 17320 Dahlgren Road, Dahlgren, Virginia?22448-5100

J. Electron. Imaging. 7(4), 770-780 (Oct 01, 1998). doi:10.1117/1.482656
History: Received Apr. 14, 1998; Revised July 10, 1998; Accepted Aug. 10, 1998
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In this paper we introduce wavelet video processing of proximity sensor signals. Proximity sensing is required for a wide range of military and commercial applications, including weapon fuzing, robotics, and automotive collision avoidance. While our proposed method temporarily increases signal dimension, it eventually performs data compression through the extraction of salient signal features. This data compression in turn reduces the necessary complexity of the remaining computational processing. We demonstrate our method of wavelet video processing via the proximity sensing of nearby objects through their Doppler shift. In doing this we perform a continuous wavelet transform on the Doppler signal, after subjecting it to a time-varying window. We then extract signal features from the resulting wavelet video, which we use as input to pattern recognition neural networks. The networks are trained to estimate the time-varying Doppler shift from the extracted features. We test the estimation performance of the networks, using different degrees of nonlinearity in the frequency shift over time and different levels of noise. We give the analytical result that the signal-to-noise enhancement of our proposed method is at least as good as the square root of the number of video frames, although more work is needed to completely quantify this. Real-time wavelet-based video processing and compression technology recently developed under the DOD WAVENET program offers an exciting opportunity to more fully investigate our proposed method. © 1998 SPIE and IS&T.

© 1998 SPIE and IS&T


Video ; Wavelets


Steven E. Noel and Harold H. Szu
"Proximity sensing with wavelet-generated video", J. Electron. Imaging. 7(4), 770-780 (Oct 01, 1998). ;




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