Accurate surface estimation from high-resolution 3D microwave images

R. Trevor Clark; David M. Sheen

doi:10.1117/12.2586127

12 April 2021 Accurate surface estimation from high-resolution 3D microwave images

R. Trevor Clark, David M. Sheen

Proceedings Volume 11745, Passive and Active Millimeter-Wave Imaging XXIV; 117450O (2021) https://doi.org/10.1117/12.2586127
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Active millimeter and microwave imaging techniques can be used to create a high-resolution 3D image volume of a target’s reflectivity. Millimeter-wave imaging is commonly used for personnel security screening and numerous other applications. Backprojection based image reconstruction techniques form a 3D complex-valued volume. The complex-valued volume is commonly reduced to a real-valued volume by taking the magnitude. For anomaly detection and cross image registration of an object it is beneficial to generate an accurate representation of an object’s surface. Extracting a smooth and accurate surface from a magnitude only image is challenging. One difficulty is the magnitude image has limited resolution in the depth direction which normally limits precision to a moderate fraction of the depth resolution. Another difficulty is that the magnitude of the image depends heavily on the geometry and orientation of the object being imaged. The phase information in a complex-valued image volume provides a means to decouple the magnitude of the image from the geometry of an object and provide precision much finer than the depth resolution would indicate. This enables the generation of a smooth and accurate point cloud representation of the surface of an imaged object. A method to extract a point cloud from the phase information in a 3D complex-valued millimeter-wave image volume is developed and results with simulated and experimental data are presented

Conference Presentation

Citation Download Citation

R. Trevor Clark and David M. Sheen "Accurate surface estimation from high-resolution 3D microwave images", Proc. SPIE 11745, Passive and Active Millimeter-Wave Imaging XXIV, 117450O (12 April 2021); https://doi.org/10.1117/12.2586127

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