| 摘要 |
PURPOSE:To apply pattern recognition immune to deformation of a pattern such as rotation and expansion/compresson and position shift of the pattern by applying pattern matching after pattern conversion of power spectrum of a picture signal. CONSTITUTION:A two-dimensional discrete Fourier transformation is applied to a picture signal of two-dimension or a two-dimensional space frequency power spectrum thereof and a pre-processing before being converted into a power spectrum by using the logarithm of an angle and a radius when the two-dimensional space frequency is displayed by a polar coordinate as parameter. The pattern obtained in this way and the standard pattern applied with similar pre-processing in advance are checked for overlapping by means of the analog matching method. As a result strong pattern recognition immune to the rotation and expansion/ compression of the pattern.
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