Method and means for recognizing patterns represented in logarithmic polar coordinates
November 8, 2009. 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 3069654 Circuit for transforming rectangular coordinates to polar coordinates Image processing system Calculation of radial coordinates of polar-coordinate raster scan Generating angular coordinate of raster scan of polar-coordinate addressed memory Apparatus for converting digital chrominance signals of a cartesian color coordinate system into digital color signals and saturation signals of a polar color coordinate system and a transformation circuit Method and system for detecting elliptical objects Method for identifying three-dimensional objects using two-dimensional images Information extraction by mapping Pattern recognition process Patent #: 4843631 InventorAssigneeApplicationNo. 434100 filed on 11/08/1989US Classes:382/170, With pattern recognition or classification382/293, Changing the image coordinates708/442Coordinate conversionExaminersPrimary: Moore, David K.Assistant: Mancuso, Joseph Attorney, Agent or FirmInternational ClassG06K 009/36AbstractImage processing method and apparatus wherein candidate points are first selected in a log-polar image domain. The points may be selected by edge detection, thresholding, or any method suitable for identifying image points which are likely to lie on some feature of interest. For every candidate point there is drawn, also in the log-polar domain, a mirror image of a curve that represents the log-polar image of a straight line. There is accumulated a log-polar domain histogram of "hits" from the drawing process. Finally, a peak bin is selected. The position of the peak bin corresponds to the position of the recognized line.Other References
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