Patent Document ID: 4843631
Application ID: 07098621
Patent Status: 1

Claim One:
1. A method for analyzing a two dimensional image in an original image plane, for the purpose of determining a probability of identity, a twist angle, and an enlargement factor, between known reference patterns and contents or portions of the image, irrespective of at what position or positions of the image to be analyzed the contents or portions of the image are located, comprising; storing and processing the image to be analyzed in digital form; subjecting the stored image to a two-dimensional Fourier transformation operation to generate a Fourier transform of the image; determining a separated-off amplitude distribution or another amplitude distribution which can be ascertained from said separated-off amplitude distribution of said Fourier transform of the image; comparing, in a Fourier range, said separated-off amplitude distribution, or said other amplitude distribution, to separated-off amplitude distributions or other amplitude distributions which can be determined therefrom of the reference patterns which are stored digitally; ascertaining the respective probability of identity, the twist angle and the enlargement factor as between the reference pattern and the image content or portion; locating an image content or portion in the image which is identical with a stored reference pattern with the ascertained degree of probability of identity by assimilating the reference pattern, or the Fourier transform of the reference pattern, to the image content or portion in respect of size and orientation by inverse rotary extension with said ascertained twist angle and enlargement factor and by then establishing the position or positions at which the reference pattern, when converted by inverse rotary extension, has maximum identity with a section of the image being analyzed.