Adaptive anisotropic filter for determining elements of intersecting by a contour signal a zero level
A. M. Prudnikov, I. V. Razin, and V. S. Emdin
St. Petersburg
Pages: 20-26
Abstract
A two-dimensional adaptive filter that forms a contour signal of image objects by accumulation of the initial signal in the direction of orientation of the contour difference and by its double differentiation in the orthogonal direction is implemented. The adaptation parameters of the filter are local estimates obtained by procedures of for- mation of a covariance matrix, its diagonalization, and estimation of eigenvectors of the characteristic equation of the matrix determinant. The signal accumulation operation compensates for the loss in the signal-to-noise ratio of the filter contour signal, which is explained by the necessity of performing the double differentiation operation. This is a favorable advantage of the filter over the classical Marr-Hildrett filter.
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