Recognition of Partially Occluded Shapes Using Boundary Matching in Distance Image

Hong-Chih Liu; M. D. Srinath

doi:10.1117/12.969725

1 March 1990 Recognition of Partially Occluded Shapes Using Boundary Matching in Distance Image

Hong-Chih Liu, M. D. Srinath

Proceedings Volume 1192, Intelligent Robots and Computer Vision VIII: Algorithms and Techniques; (1990) https://doi.org/10.1117/12.969725
Event: 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, 1989, Philadelphia, PA, United States

Abstract

A new translation and rotation invariant algorithm to identify and locate occluded objects in an image is presented. The points of local maxima and minima of the curvature function extracted from a digitized image of the object and smoothed by a Gaussian filter are used as control points and the object boundary is approximated by straight-line segments connecting these points. A two-pass boundary matching procedure is used to match the control points of the test shape to those of the object to be recognized. The matching is done from local to global, that is, from matching one segment pair to matching groups of segment pairs. The possible translational and rotational parameters (0, Ax, Ay) between the two shapes is recorded and a distance transformation used to determine the set which yields the best match. The algo-rithm has been successfully used to locate a set of tools from occluded images.

Citation Download Citation

Hong-Chih Liu and M. D. Srinath "Recognition of Partially Occluded Shapes Using Boundary Matching in Distance Image", Proc. SPIE 1192, Intelligent Robots and Computer Vision VIII: Algorithms and Techniques, (1 March 1990); https://doi.org/10.1117/12.969725

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