Method for evaluating the signals of an electronic image sensor during pattern recognition of image contents in a test piece

A method for evaluation of a multiple pixel output signal of an electronic image sensor in the course of pattern recognition of the image content of an image of a test body including;

• generating a multiple pixel output signal, said signal comprising a window within said image of said test body having a size of n×n pixels;
• analyzing the image content in said window by converting said output signal into at least one invariant characteristic value using at least one calculation specification in the form of a two-dimensional mathematical spectral transformation method selected from the group comprising a Fourier, Walsh, Hadamard or circular transformation;
• weighting said characteristic value with at least one indistinct affiliation function, said affiliation function defining a relationship between a value range of said characteristic value and a characteristic;
• generating a higher order indistinct affiliation function by conjunctive linking of all of said affiliation functions of said characteristic;
• determining a sympathetic value from said higher order affiliation function, said sympathetic value defining a degree to which a characteristic in said image is similar to a reference characteristic;
• comparing said sympathetic value with a threshold value;
• and
• deciding a class affiliation for said signal from said comparison of said sympathetic value and said threshold value.

A method for evaluation of a multiple pixel output signal of an electronic image sensor in the course of pattern recognition of the image content of an image of a test body including;

• generating a multiple pixel image of said test body to be evaluated;
• dividing said image to be evaluated into N×N grid-like windows each having a size of n×n pixels;
• analyzing said image context of one of said windows of said size of n×n pixels;
• defining two-dimensional spectra from said image contents;
• and
• forming a spectral transformation using a circular transformation.