[특허]Methods and apparatus for digitizing and processing of analog barcode signals

[미국특허] Methods and apparatus for digitizing and processing of analog barcode signals 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-007/10
출원번호	US-0558715 (2000-04-26)
발명자 / 주소	Hong Tang Donald Alexander Collins, Jr. Kenneth Joseph Fabian Barry Myron Merganthaler
출원인 / 주소	NCR Corporation
대리인 / 주소	Priest & Goldstein PLLC
인용정보	피인용 횟수 : 13 인용 특허 : 19

초록 ▼

A system for digital barcode processing. A light reflected from a barcode is captured by a photodetector to produce a photocurrent. The photocurrent is converted to a voltage, amplified and filtered to produce a photovoltage. The photovoltage is differentiated to form a first derivative signal and the first derivative signal is converted to a digital first derivative signal and processed to identify logic transitions represented by the barcode. The processing system subjects the photosignal to Gaussian filtering and differentiates the digital first derivative signal to form a second derivative signal. The digital first derivative signal is compared against a positive and a negative threshold and the second derivative signal is examined to detect zero crossings. When a positive peak of the first derivative exceeds the positive threshold and the second derivative undergoes a negative zero crossing within a predetermined time before or after the positive peak exceeds the positive threshold, a negative logic transition is identified. When a negative peak of the first derivative exceeds the negative threshold and the second derivative undergoes a positive zero crossing within a predetermined time before or after the first derivative exceeds the negative threshold, a positive logic transition is identified.

대표청구항 ▼

1. A barcode processing system for processing a photosignal produced by a photodetector in response to light reflected from a barcode, the barcode comprising elements including wide and narrow bars and spaces, onto the photodetector, the system comprising:a differentiator for producing a first derivative signal based on the photosignal; an analog to digital converter for producing a digital first derivative signal based on the first derivative signal, the digital first derivative signal comprising a series of samples taken at equal intervals in order to create an accurate representation of the first derivative signal, the intervals being independent of the characteristics of the first derivative signal; and a processor for processing the digital first derivative signal to recognize logic transitions represented by the photosignal, the processor being operative to differentiate the first derivative signal to produce a second derivative signal, the processor also being operative to create a threshold based on peaks of the photosignal, the processor being further operative to recognize a logic transition when the second derivative signal experiences a zero crossing within a predetermined time window after an amplitude peak of the digital first derivative signal exceeds said threshold, said threshold comprising an AC threshold component added to a DC threshold component, said AC threshold component based on amplitudes of peaks of said digital first derivative signal.

이 특허에 인용된 특허 (19) 인용/피인용 타임라인 분석

Barkan Edward (Miller Place NY), Bar code reader with multiple sensitivity modes using variable thresholding comparisons.
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Sato Shinichi,JPX ; Iwaguchi Isao,JPX ; Shinoda Ichiro,JPX ; Kashiwazaki Tomoyuki,JPX, Binary device for bar code reader.
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Sato Shinichi (Kawasaki JPX) Moriya Kazumasa (Urawa JPX), Circuit for processing analog signal obtained by scanning bar code.
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Brosnan Michael (Fremont CA) Quan Ronald (Cupertino CA), Digital bar code slot reader with threshold comparison of the differentiated bar code signal.
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Barkan Edward (Miller Place NY) Bridgelall Raj (Mt. Sinar NY), Digitizer circuit for a bar code reader.
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Martino Raymond A. (San Jose CA), Digitizer for barcode scanner.
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Bridgelall Raj (Mt. Sinai NY) Barkan Edward (Miller Place NY), Digitizing circuit for a laser scanner including positive peak detectors.
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Schwartz Eric D. ; Hunter Vivian L. ; McEnery Dennis W. ; Canale James L., Method and apparatus for decoding bar code symbols.
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Coleman ; Jr. Edward P. (Fairport NY), Method and apparatus for detecting edges in a signal obtained from a bar code scanned in the Fresnel zone.
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Arends Thomas C. (Eugene OR) Elliott Randy D. (Eugene OR), Method and apparatus for detecting transitions in a time sampled input signal.
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Nakanishi Sadao (Ise JPX) Suzuki Kazuhiro (Ise JPX) Tokura Nobufumi (Ise JPX) Endo Shinichiro (Ise JPX), Method and apparatus for reading label bar codes.
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Cherry Craig D. (Eugene OR), Method and system for control of a bar code scanner threshold.
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Spitz Glenn Steven, Methods to determine and selectively sample positive and negative peak values occurring within a scan reflectance profile signal.
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Marwin Gregg A. (Douglaston NY), Object sensing system for bar code laser scanners.
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Bridgelall Raj ; Barkan Edward ; Shellhammer Stephen ; Campanelli Joseph ; Katz Joseph ; Li Yajun ; McGlynn Daniel R., Optical scanners.
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Arends Thomas C. ; Elliott Randy D., Signal conditioning for variable focus optical reader.
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Elliott Randy D. (Eugene OR) Loris Blaine F. (Eugene OR), Signal processing apparatus and method.
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Peterson Donald S. (Philomath OR) Taussig Andrew P. (Eugene OR), Signal transition detection method and system.
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Barkan Edward (Miller Place NY), System for digitizing a scanned signal indicating changes in signal intensity.
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이 특허를 인용한 특허 (13) 인용/피인용 타임라인 분석

Gibson, Gregory T., Bar code scanner having an adaptive threshold using a first derivative amplitude.
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Iwaguchi,Isao; Miyazawa,Hideo; Watanabe,Mitsuo; Yamazaki,Kozo; Ohkawa,Masanori, Bar-code reader and method of reading bar-code.
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Barkan, Edward, Data collection signal processing for increased performance in electro-optical readers.
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Madej, Dariusz J.; Boriotti, Joseph; Goren, David P.; Gurevich, Vladimir; Shi, David Tsi, Decoding algorithm for laser scanning bar code readers.
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Brown, Dean R.; Davis, Wyatt O.; Tauscher, Jason B., MEMS device having a drive coil with curved segments.
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Iwaguchi, Isao; Kaku, Takashi; Murata, Hiroyasu; Yamazaki, Kozo; Ohkawa, Masanori; Watanabe, Mitsuo; Miyazawa, Hideo, METHOD OF READING INFORMATION AND APPARATUS THEREFOR, METHOD OF ACQUIRING SIGNAL FOR USE WITH INFORMATION READING APPARATUS, METHOD OF PROCESSING BAND LIMITATION, METHOD OF EXTRACTING TIMING POINT AM.
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Tang, Hong; Gu, Yeming, Methods and apparatus for area weighted means processing of barcode signals.
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Brown, Dean R.; Davis, Wyatt O.; Gibson, Gregory T.; James, Richard A., Non-resonant drive for adaptive trajectory of a scanner system having a MEMS device.
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Collet, Roeland; James, Richard A.; Brown, Dean R.; Davis, Wyatt O., Scanning module for a scanner system having a MEMS device or the like.
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Brown, Dean R.; Davis, Wyatt O.; Tauscher, Jason B.; Bowman, David R., Suspension for maintaining mirror flatness of a MEMS device in a scanner system or the like.
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Kropfitsch, Michael; Ceballos, Jose Luis, System and method for low distortion capacitive signal source amplifier.
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Gibson, Gregory T.; James, Richard A.; Davis, Wyatt O., System for determining an operational state of a MEMS based display.
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Gibson, Gregory T.; James, Richard A.; Davis, Wyatt O., System for determining an operational state of a MEMS based laser scanner.
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[미국특허] Methods and apparatus for digitizing and processing of analog barcode signals 원문보기