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Real time implementation of the hough transform

Patent 5430810 Issued on July 4, 1995. Estimated Expiration Date: Icon_subject June 18, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

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Method and means for recognizing patterns represented in logarithmic polar coordinates
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Inventor

Application

No. 078071 filed on 06/18/1993

US Classes:

382/281, Walsh, Hough, or Hadamard transform382/199, Pattern boundary and edge measurements701/28Having image processing

Examiners

Primary: Mancuso, Joseph
Assistant: Chang, Jon

Attorney, Agent or Firm

Foreign Patent References

  • 2-341985 EP. 11/24/1989
  • 2-361914 EP. 04/24/1990

International Class

G06K 009/36

Abstract

In accordance with the present invention, a method and apparatus are disclosed for real-time processing of digitized image data using an implementation of the Hough transform. More specifically, frames of image data are received and stored as pixel arrays in a rectangular coordinate system. Pixels having values above a predetermined intensity are subsequently transformed into polar coordinate space. Maximum meeting points of curves associated with all pixels which have been transformed into polar coordinate space are then identified using a real-time, hardware implementation of a neuro-Hough transform for analyzing windowed portions of the digitized image. The present invention identifies maximum meeting points in polar coordinate space using a neuro-Hough transform implemented as a single chip.

Other References

  • "Real-Time Optical Hough Transform for Industrial Inspection", Intelligent Robts and Computer Vision: Algorithms and Techniques, Richards & Casasent, vol. 1192, 1989
  • "A Real-Time Processor for the Hough Transform" IEEE Transactions On Pattern Analysis And Machine Intelligence, Hanahara, Maruyama and Uchiyama, vol. 10, No. 1, Jan. 1988
  • "A Monolithic Hough Transform Processor Based On Restructuable VLSI", IEEE Transactions On Pattern Analysis And Machine Intelligence, Rhodes, vol. 10, No. 1, Jan., 1988
  • "Monolithic Processor Performs Histogram, Hough Transforms at 20 MHz", Computer Design, p. 91, Mar. 1, 1989
  • "The Vote Tallying Chip: A Custom Integrated Circuit" University of Rochester, Sher and Tevanian, Nov. 198
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