Resources Contact Us Home
Method and system for forming image by backprojection

Image Number 13 for United States Patent #5805098.

The method and system quickly and simultaneously generate multi-resolution and high-resolution imagery from projection data obtained, e.g., through synthetic aperture radar, magnetic resonance imaging, x-ray CAT scans, seismic imaging, sonar imaging, and acoustic imaging. The backprojector technique is modified by a quadtree decomposition of the image area. The sensor elements are grouped into subapertures, and an image is formed in each subaperture by backprojection. The subapertures are grouped into larger subapertures and an image is formed in each of the larger subapertures by backprojection. This operation is repeated until a single large subaperture is defined which covers the entire antenna array. In this way, common additions are factored, computed once and reused many times. A set of N projections can produce an N.times.N image through O(N.sup.2 log N) operations.

  Recently Added Patents
Fire detector
Launch cable case
Composition for enhancing memory and mitigating neurodegeneration and method thereof
Drive and startup for a switched capacitor divider
Method for dropping packet data, radio communication device, and mobile communication system
Semiconductor device and method for manufacturing the same
Advanced CAPTCHA using images in sequence
  Randomly Featured Patents
Photographic element comprising antistatic layer
Transimpedance amplifier with a high gain/bandwidth product for conversion of a DAC output current
Dual arm substrate handling robot with a batch loader
Purge assembly
Recording and/or reproducing apparatus, portable recording and reproducing apparatus, data transfer system, data transfer method, and data recording and reproducing method
Toothed belt attachment
4-(N-benzyl-N-methylamino)pyridine acid salts and use in preparation of polymer-supported catalysts
Optical radio transmission system and a method for adjusting optical axes thereof
Variable-delivery external gear pump
Branch predictor accuracy by forwarding table updates to pending branch predictions