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Proceedings Paper

Salient contour extraction for target recognition
Author(s): Kashi Rao; James H. Liou
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Paper Abstract

To achieve robust and efficient object recognition, particularly from real outdoor images, methods to reduce clutter and extract salient information of objects need to be developed. Towards this end, the authors present a technique to rank and extract salient contours from a 2-D image acquired by a passive sensor. The goal is to find important contours corresponding to possible objects. The method presented starts with edgels from an edge detector and assigns a saliency measure to linked edgels (contours) based on length, smoothness, and contrast. For length the authors use the number of edgels in the contour; for smoothness they use average change of curvature; and for contrast, the edge magnitude. Contours are ranked by saliency and the more salient contours selected. This method is tested on several real outdoor images of objects in cluttered and occluded conditions. Excellent results are obtained. Performance of this technique is evaluated in the context of a recognition system that matches 2-D image corners with 3-D model vertices. Graphs, using corners on the object of interest and clutter are used to demonstrate the appropriateness of saliency ranking. Curves are plotted to display the percentage of object corners to all image corners for the top few salient contours. Extracting the more salient contours increases the ratio of image corners on the object to all image corners, reducing the search space for the corner matching step in recognition.

Paper Details

Date Published: 1 August 1991
PDF: 14 pages
Proc. SPIE 1482, Acquisition, Tracking, and Pointing V, (1 August 1991); doi: 10.1117/12.45705
Show Author Affiliations
Kashi Rao, Texas Instruments Inc. (United States)
James H. Liou, Texas Instruments Inc. (United States)

Published in SPIE Proceedings Vol. 1482:
Acquisition, Tracking, and Pointing V
Michael K. Masten; Larry A. Stockum, Editor(s)

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