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Green Image
Issue No. 11 - November (1991 vol. 13)
ISSN: 0162-8828
pp: 1185-1192
<p>The authors propose a computational technique for the directional analysis of piecewise linear patterns in images based on the notion of zero crossings in gradient images. A given image is preprocessed by a sequence of filters that are second derivatives of 2-D Gaussian functions with different scales. This gives a set of zero-crossing maps (the scale space) from which a stability map is generated. Significant linear patterns are detected from measurements on the stability map. Information regarding orientation of the linear patterns in the image and the area covered by the patterns in specific directions is then computed. The performance of the method is illustrated through applications to a simple test image made up of straight bar patterns as well as to scanning electron microscope images of collagen fibrils in rabbit ligaments. The method has significant applications in quantitative analysis of ligament healing and in comparison of treatment methods for ligament injuries.</p>
scale space images; directional analysis; piecewise linear patterns; zero crossings; gradient images; 2-D Gaussian functions; stability map; orientation; scanning electron microscope images; collagen fibrils; rabbit ligaments; ligament healing; treatment methods; ligament injuries; biology computing; computer vision; filtering and prediction theory

R. Rangayyan, C. Frank and Z. Liu, "Directional Analysis of Images in Scale Space," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 13, no. , pp. 1185-1192, 1991.
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