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A method and an apparatus are proposed for performing a comparison of patterns of invariable form, especially fingerprint pattern. By the application of a finger on a prism within a beam of light, a latent picture of fingerprint lines is obtained which is optically compared with a copy of the same f

A method and an apparatus are proposed for performing a comparison of patterns of invariable form, especially fingerprint pattern. By the application of a finger on a prism within a beam of light, a latent picture of fingerprint lines is obtained which is optically compared with a copy of the same fingerprint stored in memory or located on a card. After conversion into an electrical variable, an identification pulse results which is subjected to at least one test criterion and compared with a threshold value. Preferably the testing of a master symbol located on the inserted card is effected at the same time, comparing this with a copy of the same stored in memory within the appliance. If the test criteria show an agreement of the fingerprint with the fingerprint copy and/or of the master symbol with the copy of the master symbol then a positive assessment is effected, and access to a building, for instance, is furnished.

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A method of comparing a first fingerprint pattern with a second fingerprint pattern formed by a recorded representation which comprises positioning said first and second fingerprint patterns relative to each other, directing a light beam from a lamp onto said first fingerprint pattern which light be

A method of comparing a first fingerprint pattern with a second fingerprint pattern formed by a recorded representation which comprises positioning said first and second fingerprint patterns relative to each other, directing a light beam from a lamp onto said first fingerprint pattern which light beam is reflected thereby, scanning said reflected light beam directed from said first fingerprint pattern by use of a rotatable double wedge prism scanner, including first and second spaced wedge prisms while rotating said first wedge prism at a rotational speed different from said second wedge prism, superimposing said scanned light beam onto said second fingerprint pattern, directing said light beam from said second fingerprint pattern onto a photoelectric conversion means to produce an electrical output signal including an identification pulse, directing said electrical output signal into an electronic evaluation device, comparing said electrical output signal with an adjustable threshold value, prior to threshold comparison, preparing and discriminating said electrical output signal by which an identification pulse resulting in an event of identity between said first and second fingerprint patterns is compared with at least one further electrical variable contained in said electrical output signal, relating said further electrical variable with said identification pulse and summing said compared identification pulse during a performance of a plurality of test criteria, producing at least one further signal derived from peripheral conditions during said comparison and comparing said derived signal in terms of a threshold value, whereby said identification pulse and said signal derived from peripheral conditions are utilized in an overall determination of matching said first and second fingerprints.