IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0561108
(2009-09-16)
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등록번호 |
US-8668149
(2014-03-11)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Metrologic Instruments, Inc.
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대리인 / 주소 |
Addition, Higgins, Pendleton & Ashe, P.A.
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인용정보 |
피인용 횟수 :
274 인용 특허 :
12 |
초록
▼
Misreads in decodable indicia by terminals such as bar code scanners (e.g., laser, image sensors) can occur. Solutions can include increasing redundancy or screening out erroneous data. Embodiments of screening error reduction circuits, terminals, and/or methods for processing decodable indicia data
Misreads in decodable indicia by terminals such as bar code scanners (e.g., laser, image sensors) can occur. Solutions can include increasing redundancy or screening out erroneous data. Embodiments of screening error reduction circuits, terminals, and/or methods for processing decodable indicia data are provided.
대표청구항
▼
1. A method for operating a scanning apparatus comprising: providing a laser light source, a focusing apparatus, a scanning apparatus, a detector, a digitizer, and a decoder;passing a laser beam through the focusing apparatus along an axis illuminating a target comprising an encoded symbol;scanning
1. A method for operating a scanning apparatus comprising: providing a laser light source, a focusing apparatus, a scanning apparatus, a detector, a digitizer, and a decoder;passing a laser beam through the focusing apparatus along an axis illuminating a target comprising an encoded symbol;scanning the encoded symbol;receiving scattered light from the target and converting the received scattered light to a first signal;converting the first signal to a second signal comprising a digital data stream;decoding the second signal into a decoded symbol;determining whether the decoded symbol includes a data misread error, where the determining comprises, generating print variation measurement data for the encoded symbol from the second signal and the decoded symbol, andtransforming deviations on individual element print variation measurements for elements comprising the encoded symbol relative to baseline print measurements for the encoded symbol to identify when the decoded symbol includes the data misread error; andoutputting the decoded symbol that does not include the data misread error for display or storage. 2. The method of claim 1, comprising rejecting the decoded symbol including the data misread error. 3. The method of claim 1, where said generating print variation measurement data comprises: normalizing element width data of a 1D bar code by dividing by an average module size; andsubtracting the normalized element data from data representing the decoded symbol. 4. The method of claim 1, where said transforming deviations on individual element print variation measurements comprises: determining a baseline print level for the encoded symbol by averaging individual element print measurements for the encoded symbol;calculating an individual element difference values by subtracting element print variation measurements from the baseline print level;setting a total encoded deviations value by counting a number of said difference values in the encoded symbol greater than a first threshold measurement; andcomparing said total encoded deviations value to a second threshold value, the decoded symbol to include the data misread error when the total encoded deviations value is greater than the second threshold. 5. The method of claim 4, wherein the averaging comprises a moving average of elements, a weighted moving average or linear regression trend line of the print measurements across the encoded symbol. 6. The method of claim 4, where the first threshold value is representative of a print measurement variation that is a statistical outlier relative to a noise distribution in the encoded symbol data. 7. The method of claim 4, where the second threshold value is representative of an acceptance level corresponding to a symbology type of the encoded symbol. 8. The method of claim 7, wherein the acceptance level is empirically determined according to a bar code symbology type, and where the encoded symbol is a 1D bar code wherein the ID bar code is an UPC-A/EAN 13 code having 59 bars and 95 elements. 9. The method of claim 4, wherein the total encoded deviations value is determined by averaging counted outlier data over a range of first threshold values. 10. The method of claim 4, wherein the total encoded deviations value is representative of integrating outlier difference values over the range of first threshold values. 11. A method of processing data for a terminal comprising: receiving encoded bar code data;decoding the received encoded bar code data to a first decoded representation; anddetermining when the first decoded representation includes a data misread,wherein said determining comprises:normalizing the encoded bar code data,determining print variation of each individual element of the received normalized encoded bar code data,determining a combined print variation measurement for the received encoded bar code data,determining a first set of element measurements greater than a first threshold using a difference between the individual element print variation and the combined print measurement for the encoded bar code, anddetermining a misread print variation value by comparing the first set to an error noise print variation level,identifying said data misread when the misread print variation value is greater than a misread threshold; andrejecting said first decoded representation when said data misread is identified. 12. The method of claim 11, wherein the print variation of each individual element includes an edge measurement or a width measurement of the individual elements. 13. The method of claim 11, wherein the determining a combined print variation measurement for the received encoded bar code data comprises using data of the first decoded representation.
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