Technique for edge/corner detection/tracking in image frames
Patent 5311305 Issued on May 10, 1994. Estimated Expiration Date: 
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.
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 ReferencesMotion detection circuit Confirmed boundary pattern matching Image stabilization Method of detecting horizontal movements in the picture contents of a television signal Patent #: 5153719 InventorsAssigneeApplicationNo. 906916 filed on 06/30/1992US Classes:348/169, OBJECT TRACKING348/208.99, Camera image stabilization348/416.1Including motion vectorExaminersPrimary: Chin, Tommy P.Assistant: Lee, Richard Attorney, Agent or FirmInternational ClassH04N 007/18AbstractEdges/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
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