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US 4,288,780 AGranted
Pattern recognition system
OwnerAlexander S. Theodoru, Stefan G. Theodoruinventors
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Abstract
A pattern recognition system for protecting against the theft of automobiles, the unauthorized opening of doors, the unauthorized opening of other items such as brief cases and the like is disclosed. The system of this invention includes a matrix card having a matrix array, a card reader and a comparator. Elements of the array on the card are perforated to provide a coded pattern on the card. The reader senses these perforations and senses those elements of the array that are not perforated. The output of the reader is applied to the comparator which is pre-set according to the code on the matrix card. If the pre-set code in the comparator matches the code on the card, the comparator provides a positive recognition output signal.
Claims22
A pattern recognition system comprising:
- a thin card having a matrix array, said card being coded by perforating a plurality of elements of said matrix array in a pattern to be recognized;
- a card reader, said reader having means for receiving said card and producing an electrical signal for every matrix position on said card;
- a comparator including, an matrix array of radiant energy emitting elements said array of radiant energy emitting elements being arranged such that each one of said radiant energy emitting elements matches in number and location, a different one of said elements of said matrix array of said card and an array of radiant energy sensors identical to said array of radiant energy emitting elements, each being sensor optically aligned with a different one of said radiant energy emitting elements of said array of radiant energy emitting elements, said comparator having a pre-set code such that said comparator provides a "1" logic level output signal when said pre-set code in said comparator matches exactly the code on said card when said card is inserted into said reader and provides a "0" logic level output signal when said pre-set code in said comparator and the code in said card do not match exactly when said card is inserted into said reader, said reader providing input signals to said comparator indicative of the code of a card inserted into said reader,
- an array of Schmitt trigger circuits, means for coupling the said electrical signals from said card reader to a corresponding one of said Schmitt trigger circuits, and means for coupling the outputs of said Schmitt trigger circuits to said comparator.
1 more element
A recognition system for recognizing a selected permutation pattern in a physical structure carrying a first matrix array of code points, each code point in said first matrix array carrying a presence or absence physical structure in said selected permutation pattern, comprising
- reader means having a code point sensing matrix array for simultaneously sensing each matrix position in said first matrix array of code points and producing one of two electrical signals corresponding to each code point in said first matrix array,
- a second matrix array of code points, the code points in said second matrix array having one of two electrical signals at each code point in a permutation pattern corresponding to the selected permutation pattern to be recognized,
- a third matrix array of comparators corresponding to said sensing matrix array and second matrix arrays for simultaneously comparing the electrical signals at each corresponding matrix point from said sensing matrix array with the electrical signals from said second matrix array at each corresponding matrix point and producing a recognition signal only upon correspondance between the permutation pattern of every matrix point in said sensing matrix array with a permutation pattern in said second matrix array of code points.
A pattern recognition system comprising:
- a thin card having a matrix array, said card being coded by perforating a plurality of elements of said matrix array in a pattern to be recognized;
- a card reader, said reader having means for receiving said card and producing an electrical signal for every matrix position on said card;
- an matrix array of light emitting diodes, said array of light emitting diodes being arranged such that each one of said light emitting diodes matches in number and location, a different one of said elements of said matrix array of said card and an array of photodiodes identical to said array of light emitting diodes, each photodiode being optically aligned with a different one of said light emitting diodes of said array of light emitting diodes, a plurality of buffer circuits equal in number to the number of said photodiodes of said photodiode array;
- each one of said plurality of buffer circuits having an input and an output;
- a pluraity of amplifier circuits equal in number to said plurality of buffer circuits;
- each one of said amplifiers having an input and an output;
- a plurality of Schmitt trigger circuits equal in number to the number of said amplifier circuits, each one of said Schmitt trigger circuits having an input and an output;
- means to couple said output of each one of said photodiodes of said photodiode array to said input of a different one of said plurality of buffer circuits;
- means to couple said output of each one of said buffer circuits of said plurality of buffer circuits to said input of a different one of said plurality of amplifiers;
- means to couple said output of each one of said amplifiers of said plurality of amplifiers to said input of a different one of said plurality of Schmitt trigger circuits;
- a comparator, said comparator having a pre-set code such that said comparator provides a "1" logic level output signal when said pre-set code in said comparator matches exactly the code on said card when said card is inserted into said reader and provides a "0" logic level output signal when said pre-set code in said comparator and the code in said card do not match exactly when said card is inserted into said reader, said reader providing input signals to said comparator indicitive of the code of a card inserted into said reader and;
- means to couple said output of each one of said plurality of Schmitt trigger circuits to said comparator.
9 more elements
A pattern recognition system comprising:
- a thin card having a matrix array, said card being coded by perforating a plurality of elements of said matrix array in a pattern to be recognized;
- a card reader, said reader having means for receiving said card and producing an electrical signal for every matrix position on said card;
- said card reader including an array of sensing points equal in number to the number of elements in said matrix array on said card, each one of said plurality of sensing points corresponding in position with a different one of said elements of said matrix array on said card when said card is inserted into said means for receiving;
- an array of sensing point contacts, each one of said sensing point contacts being aligned with a different one of said array of sensing points, respectively;
- a comparator coupled to said card reader, said comparator having a pre-set code such that said comparator provides a "1" logic level output signal when said pre-set code in said comparator matches exactly the code on said card when said card is inserted into said reader and provides a "0" logic level output signal when said pre-set code in said comparator and the code in said card do not match exactly when said card is inserted into said reader, means to couple said array of sensing point contacts to said reader providing input signals to said comparator indicitive of the code of a card inserted into said reader, and
- wherein said means to couple each one of said array of sensing point contacts to said comparator comprises:
- a plurality of logic inverter circuits equal in number to the number of sensing point contacts of said array of sensing point contacts, each one of said plurality of logic inverter circuits having an input and an output;
- means to couple each one of said sensing point contacts of said array of sensing point contacts to said input of a different one of said plurality of logic inverter circuits;
- and
- means to couple said output of each one of said plurality of logic inverter circuits to said comparator.
7 more elements
Dependencies are inferred from the claim text.