[특허]Method and system for control of a bar code scanner threshold

[미국특허] Method and system for control of a bar code scanner threshold 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-007/10
출원번호	US-0913728 (1986-09-30)
발명자 / 주소	Cherry Craig D. (Eugene OR)
출원인 / 주소	Spectra-Physics, Inc. (San Jose CA 02)
인용정보	피인용 횟수 : 35 인용 특허 : 10

초록 ▼

A system for control of a bar code scanner threshold with deliberate decay includes monitoring a selected scan signal characteristic of characteristics and electronically determining whether sets of signal characteristics represent a bar code or extraneous noise, and, if noise is indicated, raising the black/white threshold until noise is no longer detected. The monitored characteristics can include frequency of perceived black/white transition. In a preferred embodiment, the raw scan signal is processed through two circuits, a first circuit wherein a threshold is generated based on the signal and a selected threshold criterion, and a second circuit wherein the threshold generated in the first circuit is applied to the signal to produce a bar signal output, which output is then monitored by a noise recognition device. If noise is perceived by the noise recognition device, a threshold offset signal is generated. The threshold generated in the first circuit is raised by adding to it the threshold offset signal. Then the raised threshold is fed through a threshold detection device in a third circuit which also receives the scan signal, to produce an output bar signal which substantially excludes noise readings. In this way, although the threshold will decay to accommodate changing conditions, it will be raised as necessary if it goes so low as to start reading noise.

대표청구항 ▼

In a bar code scanner having a variable black/white scan signal processing transition threshold derived from a function of the reflected light levels received by the scanner, said variable threshold being subject to threshold decay, a method for controlling threshold to produce a substantially noise-free bar signal, comprising, monitoring selected scan signal characteristics and determining, electronically, whether sets of signal characteristics represent a bar code or extraneous noise, and if a set of signal characteristics indicates noise, raising the black/white threshold value level until noise is no longer detected.

이 특허에 인용된 특허 (10) 인용/피인용 타임라인 분석

Serge Richard F. (Lewisville NC), Bar code reader system.
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Smith Robert E. (Tucson AZ), Bar code reading system and method.
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Chadima ; Jr. George E. (Cedar Rapids IA) Ristola Eugene G. (Cedar Rapids IA), Bar code scanner.
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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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Walker Donny R. (Carrollton TX), Dual edge detector for bar codes.
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Couch William D. (Raleigh NC) Minor Richard G. (Raleigh NC), Dual threshold comparator circuit.
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Hester Gerald P. (Santa Ana CA) Sherer Paul (Costa Mesa CA), Method and apparatus for reading and decoding a high density linear bar code.
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Hara Masahiro (Kariya JPX) Sakai Toshiyasu (Kariya JPX), Optical reading apparatus with automatic gain control circuit.
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Ranney Maurice W. (Rockland NY) Pickwell Robert J. (Westchester NY), Process of bonding polysulfide sealant and caulk compositions.
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Peterson Donald S. (Philomath OR) Taussig Andrew P. (Eugene OR), Signal transition detection method and system.
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이 특허를 인용한 특허 (35) 인용/피인용 타임라인 분석

Lucera, Mark G.; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun, ANALOG SCAN DATA SIGNAL PROCESSOR EMPLOYING A TIME-DOMAIN SUBSTRATE NOISE FILTER FOR NON-LINEARLY PROCESSING ANALOG SCAN DATA SIGNALS AND REDUCING SUBSTRATE NOISE SIGNAL LEVELS THEREIN PRIOR TO FIRST.
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Gibson, Gregory T., Bar code scanner having an adaptive threshold using a first derivative amplitude.
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Kimura, Kazuto; Tanaka, You, Decoding method and decoding processing device.
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Chan Jane ; Goren David ; Kuchenbrod Harry ; Serbin Gary ; Shellhammer Stephen ; Spitz Glenn, Interface between threshold processing digitizer for bar code reader.
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Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu ; LeRoy Dickson, Laser scanning bar code symbol reader employing variable pass-band filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol.
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Lucera,Mark; Check,Frank; Knowles,C. Harry; Zhu,Xiaoxun; Dickson,LeRoy, Laser scanning bar code symbol reader employing variable passband filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol elements.
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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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Lucera, Mark G.; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun, METHOD OF AND APPARATUS FOR PROCESSING ANALOG SCAN DATA SIGNALS DERIVED BY SCANNING BAR CODE SYMBOLS USING A LASER BEAM, WHEREIN A REAL-TIME BAR CODE ELEMENT DETECTOR IS USED TO CONTROL THE DETECTION.
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Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu, METHOD OF AND APPARATUS FOR PROCESSING ANALOG SCAN DATA SIGNALS DERIVED WHILE SCANNING A BAR CODE SYMBOL USING A LASER BEAM, WHEREIN THE DETECTED BEAM SPOT SPEED OF SAID LASER BEAM IS USED TO DYNAMIC.
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Lucera, Mark; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun; Dickson, LeRoy, METHOD OF AND SYSTEM FOR SCANNING BAR CODE SYMBOLS USING A LASER SCANNING PATTERN HAVING MULTIPLE FOCAL ZONES, WHEREIN THE MINIMUM BEAM DIMENSION/MINIMUM BAR WIDTH (MBD/MBW) RATIO IS GREATER THAN OR .
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Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu ; LeRoy Dickson, MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY DETECTING TH.
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Lucera, Mark; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun; Dickson, LeRoy, MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY MEASURING TH.
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Lucera, Mark; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun; Dickson, LeRoy, MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A VARIABLE SECOND DERIVATIVE SIGNAL PASS-BAND FILTER STRUCTURE HAVING FREQUENCY CHARACTERISTICS THAT ARE CONTROLLED IN A REAL-TIME .
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Goren David ; Barkan Edward ; Bridgelall Raj, Method of scanning indicia using selective sampling.
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Goren, David; Barkan, Edward; Bridgelall, Raj, Method of scanning indicia using selective sampling.
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Hong Tang ; Donald Alexander Collins, Jr. ; Kenneth Joseph Fabian ; Barry Myron Merganthaler, Methods and apparatus for digitizing and processing of analog barcode signals.
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Tang, Hong, Methods and apparatus for dual thresholding in processing of barcode signals.
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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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David Tsi ; Mark Krichever ; Edward Barkan, Multi-channel signal processing in an optical reader.
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Tsi David ; Krichever Mark ; Barkan Edward, Multi-channel signal processing in an optical reader.
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Tsi,David; Krichever,Mark; Barkan,Edward, Multi-channel signal processing in an optical reader.
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Lucera, Mark; Ralph, Joseph, Multipath scan data signal processor having multiple signal processing paths with different operational characteristics to enable processing of signals having increased dynamic range.
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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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Bridgelall Raj ; Barkan Edward ; Shellhammer Stephen ; Campanelli Joseph ; Katz Joseph ; Li Yajun ; McGlynn Daniel R., Optical 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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Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu ; LeRoy Dickson, Reading system a variable pass-band.
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Mark G. Lucera ; C. Harry Knowles ; Xiaoxun Zhu, SCAN DATA SIGNAL PROCESSOR EMPLOYING PASS-BAND FILTER STRUCTURES HAVING FREQUENCY RESPONSE CHARACTERISTICS DYNAMICALLY SWITCHED INTO OPERATION BY CONTROL SIGNALS INDICATIVE OF THE FOCAL ZONE OF THE L.
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Lucera, Mark G.; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun, Scan data signal processor employing band-pass filter having frequency response characteristics controlled by the depth of focus of the laser scanning beam.
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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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Wang Ynjiun P. ; Ye Angi, Sub-pixel dataform reader with dynamic noise margins.
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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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Olmstead,Bryan L., System and method for determining a threshold for edge detection based on an undifferentiated equalized scan line signal.
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Kruppa, Hannes Martin, System and method for recovering image detail from multiple image frames in real-time.
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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] Method and system for control of a bar code scanner threshold 원문보기