U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Technique for edge/corner detection/tracking in image frames

Patent 5311305 Issued on May 10, 1994. Estimated Expiration Date: Icon_subject June 30, 2012. 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.

Patent References

Motion detection circuit
Patent #: 4884136
Issued on: 11/28/1989
Inventor: Ninomiya, et al.

Confirmed boundary pattern matching
Patent #: 5018218
Issued on: 05/21/1991
Inventor: Peregrim, et al.

Image stabilization
Patent #: 5053876
Issued on: 10/01/1991
Inventor: Blissett, et al.

Method of detecting horizontal movements in the picture contents of a television signal Patent #: 5153719
Issued on: 10/06/1992
Inventor: Ibenthal

Inventors

Assignee

Application

No. 906916 filed on 06/30/1992

US Classes:

348/169, OBJECT TRACKING348/208.99, Camera image stabilization348/416.1Including motion vector

Examiners

Primary: Chin, Tommy P.
Assistant: Lee, Richard

Attorney, Agent or Firm

International Class

H04N 007/18

Abstract

Edges/corners in an image can be detected and tracked over time by first sampling the image at periodic time intervals, and then processing the samples to obtain the intensity value for each pixel within each image acquired at a particular time. For each pixel, the bidirectional intraframe correlation of its intensity with the intensities of pixels along each of several directions within the same image is computed. Also, the bidirectional interframe correlation of the intensity of each pixel in each image with the intensities of pixels along each of several directions spanning several images is established. The intraframe and interframe intensity correlations are processed to obtain spatiotemporal tangent information about isobrightness surfaces and curves which are indicative of edges and corners, respectively, and their image motions.

Other References

  • R. C. Bolles, H. H. Baker, and D. H. Marimont, "Epipolar-Plane Image Analysis: An Approach to Determining Structure from Motion," International Journal of Computer Vision, vol. 1, (1987), pp. 7-5
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