Abstract
: A two-dimensional (2D) N-directional edge detection filter was represented as a pair of real masks, i.e. by one complex-valued matrix [1]. The 3 × 3 compass gradient edge masks have often been used because of their simplicity, where N compass masks are constructed by rotating the kernel mask by an incremental angle of 2π/N. This paper presents complex-valued feature masks formulated by directional filtering of 3 × 3 feature masks (e.g. Prewitt, Sobel, Frei-Chen, Kirsch and roof masks), with the different number of directions N (= 8, 4 and 2). The same concept can be applied to any types of filtering/masks with arbitrary N.
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Received: 21 May 2001, Received in revised form: 15 November 2001, Accepted: 26 March 2002
ID="A1" Correspondence and offprint requests to: Professor Rae-Hong Park, Department of Electronic Engineering, Sogang University, C.P.O. Box 1142, Seoul 100–611, Korea. Email: rhpark@sogang.ac.kr
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Park, RH. Complex-Valued Feature Masks by Directional Filtering of 3×3 Compass Feature Masks. Pattern Anal Appl 5, 363–368 (2002). https://doi.org/10.1007/s100440200032
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DOI: https://doi.org/10.1007/s100440200032