IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0403460
(2006-04-13)
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등록번호 |
US-7590274
(2009-09-24)
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발명자
/ 주소 |
- Raterman, Donald E.
- Graves, Bradford T.
- Stromme, Lars R.
- Bauch, Aaron M.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
79 인용 특허 :
182 |
초록
▼
An improved method and apparatus for discriminating between currency bills of different denominations uses an optical sensing and correlation technique based on the sensing of bill reflectance characteristics obtained by illuminating and scanning a bill along one of its dimensions. A series of detec
An improved method and apparatus for discriminating between currency bills of different denominations uses an optical sensing and correlation technique based on the sensing of bill reflectance characteristics obtained by illuminating and scanning a bill along one of its dimensions. A series of detected reflectance signals are obtained by sampling and digitally processing, under microprocessor control, the reflected light at a plurality of predefined sample points as a currency bill is moved across an illuminated strip with a preselected dimension parallel to the direction of transport of the bill. The sample data is subjected to digital processing, including a normalizing process, whereby the reflectance data represents a characteristic pattern that is unique for a given bill denomination and incorporates sufficient distinguishing features between characteristic patterns for discriminating between different currency denominations. A plurality of master characteristic patterns are generated and stored using original bills for each denomination of currency to be detected. The pattern generated by scanning a bill under test and processing the data samples is compared with each of the prestored master patterns to generate, for each comparison, a correlation number representing the extent of similarity between corresponding ones of the plurality of data samples for the compared patterns. Denomination identification is based on designating the scanned bill as belonging to the denomination corresponding to the stored master pattern for which the correlation number resulting from pattern comparison is determined to be the highest, subject to a bi-level threshold of correlation.
대표청구항
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What is claimed is: 1. An improved method for discriminating between currency bills of different denominations comprising the acts of: illuminating a predetermined section of a currency bill by focusing at least one strip of light thereupon; detecting the light reflected off said illuminated sectio
What is claimed is: 1. An improved method for discriminating between currency bills of different denominations comprising the acts of: illuminating a predetermined section of a currency bill by focusing at least one strip of light thereupon; detecting the light reflected off said illuminated section of said bill to generate an analog reflectance signal; generating relative lateral displacement between said strip of light and said bill so as to illuminate and optically scan successive sections of said bill along a predetermined dimension thereof; obtaining a series of analog reflectance signals corresponding to light reflected from each of said successive bill sections; digitizing and processing said series of analog reflectance signals to yield a set of digital data samples which, in combination, represent a data pattern characteristic of the currency denomination of said bill; generating and storing a set of master characteristic patterns corresponding to optical scanning of original bills of each of the different currency denominations to be discriminated; dividing at least one of (1) said data pattern and (2) said master characteristic patterns into a plurality of sections, and shifting selected ones of said sections relative to each other; and comparing said data pattern for said scanned currency bill to each of said stored master patterns to determine the degree of correlation therebetween, and thereby to identify the denomination of said currency bill. 2. The method of claim 1, wherein said dividing act includes shifting different ones of said sections relative to each other by different amounts. 3. The method of claim 2, wherein said dividing act includes progressively shifting samples in successive ones of said sections. 4. The method of claim 3, wherein if said degree of correlation fails to meet a predetermined threshold, said dividing act is repeated using a progressively increasing number of sections in said plurality of sections. 5. The method of claim 1, wherein said dividing act includes measuring shrinkage of said bill, the number of sections in said plurality of sections being directly proportional to the measured shrinkage. 6. The method of claim 1, wherein said dividing act includes dividing each of said master characteristic patterns into a progressively increasing number of sections, progressively shifting samples in successive ones of said sections for each of said number of sections to generate a plurality of shifted patterns for each of said master characteristic patterns, and storing in a memory said plurality of shifted patterns for each of said master characteristic patterns. 7. The method of claim 6, wherein said comparing act includes comparing said data pattern for said scanned currency bill to each of said stored master patterns and said stored plurality of shifted patterns to determine the degree of correlation therebetween. 8. The method of claim 6, wherein each of said plurality of shifted patterns correspond to different degrees of shrinkage for said bill, and wherein said comparing act includes comparing said data pattern for said scanned currency bill to said stored patterns corresponding to a measured degree of shrinkage for said bill. 9. The method of claim 1, further including the act of positively identifying said scanned bill as having the denomination corresponding to the stored master pattern for which the degree of correlation is found to be the highest and at least equal to a predefined correlation threshold. 10. An improved method for discriminating between currency bills of different denominations comprising the acts of: illuminating a predetermined section of a currency bill by focusing at least one strip of light thereupon; detecting the light reflected off said illuminated section of said bill to generate an analog reflectance signal; generating relative lateral displacement between said strip of light and said bill so as to illuminate and optically scan successive sections of said bill along a predetermined dimension thereof; obtaining a series of analog reflectance signals corresponding to light reflected from each of said successive bill sections; digitizing and processing said series of analog reflectance signals to yield a set of digital data samples which, in combination, represent a data pattern characteristic of the currency denomination of said bill; generating and storing a set of master characteristic patterns corresponding to optical scanning of original bills of each of the different currency denominations to be discriminated; generating and storing a set of shifted patterns by dividing each of said master characteristic patterns into a plurality of sections and by shifting selected ones of said sections relative to each other; and comparing said data pattern for said scanned currency bill to selected ones of said stored master characteristic patterns and said stored shifted patterns to determine the degree of correlation therebetween, and thereby to identify the denomination of said currency bill. 11. The method of claim 10, wherein said act of generating and storing a set of shifted patterns includes dividing each of said master characteristic patterns into a progressively increasing number of sections, progressively shifting samples in successive ones of said sections for each of said number of sections to generate a plurality of shifted patterns for each of said master characteristic patterns, and storing said plurality of shifted patterns for each of said master characteristic patterns. 12. The method of claim 10, wherein each of said shifted patterns correspond to different degrees of shrinkage for said bill, and wherein said comparing act includes comparing said data pattern for said scanned currency bill to said stored patterns corresponding to a measured degree of shrinkage for said bill. 13. An improved method for discriminating between currency bills of different denominations comprising the acts of: illuminating a predetermined section of a currency bill with at least one strip of light; detecting the light reflected off said illuminated section of said bill to generate a reflectance signal; generating relative lateral displacement between said strip of light and said bill so as to illuminate and optically scan successive sections of said bill along a predetermined dimension thereof; obtaining a reflectance signal corresponding to light reflected from each of said successive bill sections; processing said reflectance signal to yield a set of digital data samples which, in combination, represent a data pattern characteristic of the currency denomination of said bill; retrieving from a memory a set of master characteristic patterns corresponding to optical scanning of bills of each of the different currency denominations to be discriminated; dividing at least one of (1) said data pattern and (2) said master characteristic patterns into a plurality of sections, and shifting selected ones of said sections relative to each other to generate at least one of (1) a shifted data pattern and (2) shifted master characteristic patterns; comparing at least one of (1) said shifted data pattern for said scanned currency bill to each of said stored master patterns and (2) said data pattern for said scanned bill and said shifted master characteristic patterns; and determining the denomination of said currency bill based on the act of comparing. 14. The method of claim 13, wherein said dividing act includes shifting different ones of said sections relative to each other by different amounts. 15. The method of claim 14, wherein said dividing act includes progressively shifting samples in successive ones of said sections. 16. The method of claim 15, wherein if said comparing fails to permit the denomination to be determined, said dividing act is repeated using a progressively increasing number of sections in said plurality of sections. 17. The method of claim 13, further comprising measuring shrinkage of said bill and wherein the number of sections in said plurality of sections of said dividing act is directly proportional to the measured shrinkage. 18. The method of claim 13, wherein said dividing act includes dividing each of said master characteristic patterns into a progressively increasing number of sections, progressively shifting samples in successive ones of said sections for each of said number of sections to generate a plurality of shifted patterns for each of said master characteristic patterns, and storing in a memory said plurality of shifted patterns for each of said master characteristic patterns. 19. The method of claim 18, wherein said comparing act includes comparing said data pattern for said scanned currency bill to each of said stored master patterns and said stored plurality of shifted patterns to determine a degree of correlation therebetween. 20. The method of claim 18, wherein each of said plurality of shifted patterns correspond to different degrees of shrinkage for said bill, and wherein said comparing act includes comparing said data pattern for said scanned currency bill to said stored patterns corresponding to a measured degree of shrinkage for said bill. 21. The method of claim 13, further including an act of positively identifying said scanned bill as having the denomination corresponding to the stored master pattern for which a degree of correlation is found to be the highest and at least equal to a predefined correlation threshold. 22. An improved method for discriminating between currency bills of different denominations comprising the acts of: illuminating a predetermined section of a currency bill with at least one strip of light; detecting light reflected off said illuminated section of said bill to generate a reflectance signal; generating relative lateral displacement between said strip of light and said bill so as to illuminate and optically scan successive sections of said bill along a predetermined dimension thereof; obtaining a reflectance signal corresponding to light reflected from each of said successive bill sections; digitizing and processing said analog reflectance signal to yield a set of digital data samples which, in combination, represent a data pattern characteristic of the currency denomination of said bill; retrieving from a memory a set of master characteristic patterns corresponding to optical scanning of bills of each of the different currency denominations to be discriminated; retrieving from a memory a set of shifted master patterns which were generated by dividing each of said master characteristic patterns into a plurality of sections and by shifting selected ones of said sections relative to each other; comparing said data pattern for said scanned currency bill to selected ones of said stored master characteristic patterns and said stored shifted patterns; and determining the denomination of said currency bill based on the act of comparing. 23. The method of claim 22, wherein said set of shifted master patterns were generated by dividing each of said master characteristic patterns into a progressively increasing number of sections, progressively shifting samples in successive ones of said sections for each of said number of sections to generate a plurality of shifted patterns for each of said master characteristic patterns, and storing said plurality of shifted patterns for each of said master characteristic patterns. 24. The method of claim 22, wherein each of said shifted patterns correspond to different degrees of shrinkage for said bill, and wherein said comparing act includes comparing said data pattern for said scanned currency bill to said stored patterns corresponding to a measured degree of shrinkage for said bill.
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