Shape description via the use of critical points
- 31 December 1978
- journal article
- Published by Elsevier BV in Pattern Recognition
- Vol. 10 (3), 159-166
- https://doi.org/10.1016/0031-3203(78)90024-9
Abstract
A key element in pattern recognition is the description of shape. For two-dimensional objects (blobs), shape is conveyed by the curving of the boundary line and is normally considered independent of scale and orientation. The curving may be regarded as a concatenation of arcs of varying instantaneous radii of curvature, possibly interspersed occasionally by discontinuities. The description of shape is facilitated by segmenting the boundary line at so-called critical points — corners (discontinuities in curvature), points of inflection, and curvature maxima. Additional critical points are intersections and points of tangency. Algorithms are described for extracting such critical points in the presence of noise. An illustration is given showing how the critical points may be used in the development of a shape description system.Keywords
This publication has 8 references indexed in Scilit:
- Shape Discrimination Using Fourier DescriptorsIEEE Transactions on Systems, Man, and Cybernetics, 1977
- A Corner-Finding Algorithm for Chain-Coded CurvesIEEE Transactions on Computers, 1977
- Understanding Shape: Angles and SidesIEEE Transactions on Computers, 1977
- Analysis of the digitized boundaries of planar objectsPattern Recognition, 1976
- Computer Processing of Line-Drawing ImagesACM Computing Surveys, 1974
- Fourier Descriptors for Plane Closed CurvesIEEE Transactions on Computers, 1972
- On the Quantization of Line-Drawing DataIEEE Transactions on Systems Science and Cybernetics, 1969
- On the Encoding of Arbitrary Geometric ConfigurationsIEEE Transactions on Electronic Computers, 1961