Method and means for recognizing patterns represented in logarithmic polar coordinates
US5063604A · kind A · utility
83Cited by
10References
25Claims
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Key dates
| Filing date | Nov 8, 1989 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | Nov 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/48
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Image 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.