PATTERN RECOGNITION METHOD INVARIANT AGAINST ROTATION

摘要

PURPOSE: To recognize a rotated pattern by determining the self-correlation matrix of the matrix of an image represented in terms of polar coordinates. ;CONSTITUTION: A pattern is divided by the use of polar coordinates, and a matrix is prepared by taking a representative value or the average. As a result, the pattern becomes invariant against magnification/reduction. From this matrix, the self-covariance matrix or the power spectrum of its Fourier transform is led. The resulting matrix is invariant against rotation. By utilizing this property, pattern recognition is performed.;COPYRIGHT: (C)1996,JPO