CN1081009A - Can change the bar code decoder and the interpretation method thereof of working range - Google Patents
Can change the bar code decoder and the interpretation method thereof of working range Download PDFInfo
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- CN1081009A CN1081009A CN 93105530 CN93105530A CN1081009A CN 1081009 A CN1081009 A CN 1081009A CN 93105530 CN93105530 CN 93105530 CN 93105530 A CN93105530 A CN 93105530A CN 1081009 A CN1081009 A CN 1081009A
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Abstract
This device is a code translator that is used for bar code symbol, obtains data with bar code scanner scanning bar code symbol, and data are judged whether the bar code symbol to determine to be scanned is within the working range of scanner.In addition, work range of bar code scanner can be selected and change, and the method for change is to change threshold value.This device comprises the software of handling usefulness, and is too far away if data presentation goes out to the scanning distance of bar code to handle from the resulting data of bar code scanner, a sign then is set to stop the new decode results of record in software.
Description
The present invention relates to bar code interpretation method and bar code decoder.Whether the bar code that the data judging of obtaining with bar code scanner earlier in code translator is scanned is within the acceptable working range of bar code scanner.In more detail, a kind of method and the bar code decoder of the decoding of the bar code to the effect that of invention, the change of work range of bar code scanner wherein can be selected.In the method for the invention with if to determine scanning distance too far away in the bar code decoder, a sign is set in software stops new decoding to be carried out, but still keep the intermediate result of decoding to be stored in the memory, to represent that bar code symbol is still within the scanner visual field.
Bar code scanner and code translator that past produces generally are used within the fixing working range.The exemplary operation scope of some product is from touching seven or eight inches.Under some ruuning situations, when bar code is positioned at the far-end of critical distance of scanner, for example, at seven or eight inches places, can produce wrong decode results or several different decode results to same bar code, so owing to the input data that can produce mistake obviously are unacceptable.
So fundamental purpose of the present invention provides interpretation method and bar code decoder of a bar code symbol, use bar code symbol that the data judging obtained by the scanning bar code symbol is scanned whether within work range of bar code scanner.
Another object of the present invention provides a bar code symbol interpretation method and a bar code decoder, and the change of work range of bar code scanner wherein is selectable.
Further aim of the present invention provides interpretation method and described bar code scanner of a bar code symbol, the software of handling comprising the data that bar code scanner can be obtained, a sign is set in software, if the scanning distance to bar code is too far away, then can stop from the data that record to produce new decode results.But decode results still is retained in and demonstrates bar code symbol in the memory still among the visual field of scanner in the middle of making.
According to the content of being said here, the invention provides interpretation method and a bar code decoder of a bar code symbol, the data that code translator obtains with bar code scanner earlier judge that striped is too little with the width in gap in the bar code symbol that whether is scanned, and too little expression bar code has too far also exceeded the working range of scanner apart from scanner.In general, when bar code symbol during away from scanner, the time width in striped and gap will reduce in the bar code symbol that is scanned that then records.When bar code symbol shifts near scanner, the time width in striped and gap will increase in the bar code symbol that is scanned conversely speaking.In the bar code symbol that is scanned that detects the time width in striped and gap can with a threshold, whether be within the work range of bar code scanner to determine bar code symbol.Also to carry out second judgement to determine whether examined bar code symbol is an effective bar code symbol to resulting data, it has all characteristics of bar code, perhaps the bar code symbol that is translated is an invalid symbol, and it does not have all characteristics of effective bar code symbol.Resulting data must should be passed through first judgement (bar code is not far) before being accepted as a bar code that will calculate, again by second judgement (effectively bar code symbol).
This device preferably includes memory and the timer that successively decreases as the working buffer memory, represents the striped of the detected bar code symbol that is scanned and the numerical data of gap width to be stored in the memory.After the each successful scanning, the counting of the timer that successively decreases all is initialized as zero.If the judgement to an effective bar code symbol is shown as significant character, the counting of timer of then successively decreasing is put a set-point T1, to translate the result identical with the decode results of preexist in memory if obtain second sign indicating number in the time at T1, then second decode results given up.In addition, if the judgement to an effective bar code symbol shows it is a significant character, and whether outside the judgement within the work range of bar code scanner is checked, the bar code symbol that is scanned just waits that as one the bar code symbol that provides report is accepted at the bar code symbol of determining to be scanned.Otherwise, then need carry out another time scan operation.
In addition, can easily change threshold value according to selecting, method is bar code menu bar font code of scanning, and this bar code is represented a concrete threshold value.If effectively the judgement of bar code symbol shows it is a significant character, to check then whether the bar code that is scanned is a menu bar font code, if then threshold value is changed a new threshold value shown in the menu bar font code.So threshold value can be selected, and change easily, the request for utilization to the scanning of used bar code is depended in this replacing.
Advantage of the present invention is that the bar code decoder working range can change.The accompanying drawing that this device is relevant is as follows, and components identical marks with identical mark is digital in several views among the figure.Wherein:
Fig. 1 is the logical flow chart that the software of operation logic of the present invention is realized.The present invention includes bar code interpretation method and the bar code decoder that can change working range.
Fig. 2 is the concrete device that a height has been simplified, and this device is a kind of pattern of bar code reader/scanner, can be used to the present invention is told about.
At length with reference to accompanying drawing, Fig. 1 illustrates the logical flow chart that the software of operation logic of the present invention is realized.The present invention includes interpretation method and the bar code decoder that can change working range of a bar code symbol.[starting] 10 is initialize routines of a standard, and [scanning] 12 illustrates the single pass of the bar code that bar code scanner reads and the bar code data that detects to the output of working buffer memory after [starting] 10 operation.The width in detected striped that is scanned of this data representation and gap, it is a string binary number.Next is [putting T=0] 14, and [putting T=0] illustrates the reading that is predisposed to the zero timer that successively decreases.Timer preferably selects for use software to realize.After for the first time successful decoding moved, the reading T of the timer that successively decreases always is changed to constant T1, and was identical therewith, if second decode results draws in during T1, then second decode results will do not considered.T1 is a selected time period during this time, in during T1 owing to may be to scan the result that same bar code figure obtains once more, so second identical decode results should be rejected (for example, the article that are scanned in the place of Retail commodity should be noted, and only count once) at every turn.
The next one is [decoding] 16 again, and it illustrates deciphers the bar code data in buffer storage.This program is used standard decoding software, but far checks on this point different with standard software comprising a mistake.Crossing far away the check is to check institute's striped of surveying and the width in gap whether to grow (conventional letter length) value than previously selected symbol narrower.If the too narrow bar code of then representing is too far away apart from scanner, setting too far equals 1 sign in software.Use to check striped and can roughly determine the distance of scanner to the bar code figure that is scanned with the method for gap detection time width because when apart from bar code figure apart from increase the time detection time width will reduce.
Therefore, the outer limit with bar code scanner is made as a minimum detection width (symbol-length).If, then can obtaining conclusion less than this minimum value, detection width thinks that the bar code figure that is scanned has exceeded the maximum acceptable working range of bar code scanner.The difference of using according to bar code scanning requires to select different symbol-long values for use, has so just changed the working range of scanner.
[success again? ] 18, [success? ] illustrate and judge the result of coming out.In order to determine whether being an effective bar code symbol.That is, the bar code symbol that translates has all characteristics of effective bar code (for example, a detected bar code can have a series of striped and gap width, but the sorting technique of the acceptable bar code symbol of symbol not then should be given up).If unsuccessful, promptly not indicating is an effective bar code, and then software program is got back to [scanning] 12, goes to obtain another time scanning of bar code data.Otherwise, if success, promptly, indicate and obtained an effective bar code symbol, [bar code menu below then software program continues to do? ] 20, [bar code menu? ] check bar code symbol whether to determine it from the bar code menu, bar code menu bar font code is exactly to instruction of system in fact, such as going to be provided with or changing symbol-long value in the memory.If "Yes" changes by the symbol-long value in [decoding] 16 employed memories, software program is got back to [obtaining scanning] 12 to obtain another time scanning of bar code data.If "No", could then software program begin to carry out [T=0? ] 22, [T=0? ] proofread the timer that successively decreases to determine whether it postponed.
After above-mentioned check and correction, no matter crossing, the count delay in the timer that successively decreases do not have, always the counting T of the timer that successively decreases resets to fixed value T1 by program [T=T1] 24 or 24'.Explain as top, T1 be one seclected time length, during this period of time give up identical decode results.Therefore, then does program begin to carry out [identical if counting T does not reach the delay of regulation as yet? ] 26, [identical? ] result of check decoding is shown to determine whether decode results is fully identical with the decode results of front.If two decode results are identical, then new decode results is given up, program is returned [obtaining scanning] 12 to obtain the scanning of another time bar code data simultaneously.Does then software program begin to carry out [too far away if two decode results are inequality? ] 28.Also have, the counting T of timer postponed if successively decrease, then to begin to carry out decision block by program [T=T1] 24 ' [too far away for program? ] 28, [too far away? ] check too far sign, if it is too far away that sign illustrates the bar code figure that is scanned, then give up new decode results and program and return [obtaining scanning] 12, to obtain the scanning of another time bar code data.Otherwise degree begins to carry out program block [finishing] 26.The bar code scanning that [finishing] expression translates is received, and it is effectively, and is also not far, thereby counts.
Below describe in further detail, about the timer that successively decreases, if T places the T1 value, then each unit interval, T will reduce by a counting, and up to T=0, after once successful decoding, when the bar code menu no longer occurs, T always is reset to fixed value T1.T1 also can programme, and such as with a bar code menu bar font code, but also may carry out the T1 value (for example 800 milliseconds) of a mistake in software.If it is identical to obtain the decode results of another decode results and front in time T 1, then second decoding should be cast out.Timer reset again (set is in T=T1 again).
Because timer T resets, so, also can not report new decode results in the long time in the visual field of scanner even a bar code occurs.And each successful decoding all makes timer reset once more.
In a word,, a sign is set in the software then if the symbol that is detected during this period of time at decode procedure is too far away apart from scanner, whether too far away, relatively come to determine with the time width and a previously selected symbol-long value in detected striped and gap.Usually, the time width in striped and gap will reduce when bar code is shifted to away from scanner, and when bar code shifts near scanner, the time width in striped and gap will increase.Select for use different symbol-long values can obtain different working ranges to adapt to different requirements and environment.
When the distance between symbol and scanner was in critical value, this situation often was considered too far away, thereby can not report the decode results that makes new advances.If symbol shifts near scanner makes distance less than critical decoding situation, and then decoding is normally stable, can produce the decoding of a success.In case report out the decoding of a success, then because a stable decoding will remain to resetting of time T, so can not occur other decoding again.
Fig. 2 illustrates over the device that a kind of height of bar code reader of pattern is simplified, and show wherein critical piece, reader is realized in handheld scanner, but also be can be used for for example checking output result's counting scanner or described scanner here in other device.In the concrete device of choosing, parts are installed within the outer cover 155, and 155 comprise an outlet 156, shine also transversal scanning by laser beam 151 of its output and cross the symbol 170 that is positioned at outside the cover.
Hand held device is to be published in the U.S. to be presented to people's patent No.s such as Swartz be 4 among Fig. 2,760,248 common style or U.S. Patent number are that 4896026 Part No.s that give the common style of Symbol Tech. Co., Ltd. and be similar to the bar code reader of commercial Symbol Tech. Co., Ltd. are the structure of LS8100 or LS2000.On the other hand, perhaps in addition, be presented to people's U.S. Patent numbers such as Swartz in addition and be 4,387,297 or to be presented to people's U.S. Patent numbers such as Shepard be 4409470 device.These patents have all given Symbol Tech. Co., Ltd..These patents all can be used to structure and do barcode reading unit among Fig. 2.Patent 4760248,4896026 and 4409470 is all as with reference to the data layout here.But the universal design to this device will be done concise and to the point description as a reference.
As shown in Figure 2, in reader 100 usually with laser diode or similarly device produce the light beam 151 that outwards penetrates, the irradiation of beam alignment bar code symbol, bar code symbol is arranged on the target at several inches places before the reader unit.Outwards the light beam 151 that penetrates scans with a scanning patter.The position that the user controls portable unit makes this scanning patter pass across the symbol of being read.Detected by the photosensitive device the reader 158 from the light 152 of symbol reflected or scattering, produce the electric signal that having of serial is pending and decipher, to reproduce the data of bar code representative.Be meant reflected light and/or scattered light with " reflected light " speech here.
Reader unit 100 is devices of a rifle shape in selected device, has a pistol and holds pattern handle 153.When the position of user's control device made the symbol that aligning read, movably trigger was used for allowing the user to start light beam 151 and detector circuit.A lightweight plastic casing 155 contains LASER Light Source 146, detecting device 158, optics 157,147,159, comprises the signal processing circuit of a CPU140 and power supply or battery pack 162 in addition.Transmission window 156 at shell 155 front end light enters light beam 151 ejaculations of going out and the reflected light of importing 152.User's distance certain from reader 100 apart from symbol retouched floating screed font code symbol with reader 100, and promptly reader does not contact or cross this symbol, and be general, and this handheld barcode reader regulation is operated in about several inches scope.
Reader 100 also can be used as portable computers and comprises a keyboard 148 and display 149, as described in said United States Patent (USP) 4409470 in front.
In Fig. 2, further specify lens 157(or poly-lens system) be used for scanning light beam at a suitable reference planes inner focusing to bar code symbol.For example the light source 146 of a semiconductor laser diode is positioned on the axle that transmits a light beam to lens 157.Light beam is attached on the scanning motor 160 by the silver-plated mirror of part 147 and other needed lens or structure and a mirror that waves 159,159 of forming light beam, starts this motor when trigger causes.If by light source 146 produce only sightless, then in optical system, to comprise an aiming light, if necessary, aiming light produces a visible point of light, this luminous point can resemble the laser beam be fix or scanning.The user utilizes this visible light to make reader unit aiming (bar code) symbol before causing trigger 154.
Though the bar code that the present invention is described to be used for to one dimension or two dimension is read, it is not limited to this, and it also can be used for more complicated mark is scanned.The present invention can also be used for various computer visions or the identification of optics font.Information is from the mark of other pattern, for example character of surface of literal or scanned object in these are used.
In all various embodiment, the element of scanner can be assembled into a very compact device, makes scanner can make a single printed circuit board (PCB) or integrated circuit package.The data acquisition system (DAS) that such assembly is used for various different types with can having interchangeability is as the laser scanning element, but for example this assembly mutual alternative ground is used in handheld scanner and the Flatbed scanner.Flatbed scanner can be installed on the flexing arm or install on the table or the bottom surface of desktop or as the sub-unit of more complicated data acquisition system (DAS) or divide assembly.
Assembly preferably includes a rack-mount laser/light scholar device, a scanning element, for example a rotation or reciprocating mirror and a light detector elements.Data line control and these components all are connected on the electric connector.Electric connector is installed in the side of assembly or outside surface so that assembly can couple together with the method for a supporting connector together with other element electricity consumption of data acquisition system (DAS).
Independent assembly can have specific scanning or decoding characteristic, for example, and the performability in certain operating distance or to the performability of a special symbol logical OR printing density.Characteristic can be determined by manually adjusting the relevant gauge tap of assembly.The user also can revise data acquisition system (DAS) and remove to scan the different types object, perhaps passes through to use simple electric connector for different application, goes to the modification system with the method for changing the data acquisition system (DAS) assembly.
Above-described scan components also can be realized in a self-contained data acquisition system (DAS).This system comprises one or more elements such as keyboard, display, printer, data memory, application software and database.Such system also may comprise communication interface so that this data acquisition system (DAS) can be carried out communication with local area network or telephone-switching network.Communication can be with modulator-demodular unit or integrated services digital network (ISDN) interface or from portable terminal to a fixing receiver, is transmitted by low-power radio frequency and carries out.
Though described selected concrete device and several bar code decoder that changes working range of the present invention in detail at this, clearly, announcement of the present invention can inspire those people that are proficient in this skill to do many different designs with explanation.
Claims (20)
1, a kind of method of bar code decoding is characterized in that, comprising:
A, with bar code symbol of bar code scanner scanning;
B, detected bar code symbol is become numerical data, the width that records in striped and gap in the bar code symbol that this numerical data is represented to be scanned;
C, judge whether numerical data is too little with the width in the striped of the bar code symbol that is scanned determining to record and gap; The too little expression bar code symbol of width is too far away and exceeded work range of bar code scanner; With striped and gap in the bar code symbol that is scanned record width and threshold with the width that records that determines whether to be scanned striped and gap in the bar code symbol greater than threshold value;
If d is scanned the width that records of striped and gap in the bar code symbol greater than threshold value, then be accepted as detected bar code symbol.
2, bar code interpretation method as claimed in claim 1 further comprises the step of selecting above-mentioned threshold value according to the requirement of concrete bar code scanning application for use.
3, bar code interpretation method as claimed in claim 1 further comprises the step of using scanning bar code menu bar font code to change above-mentioned threshold value, and the bar code in the menu illustrates a concrete numerical value of threshold value.
4, bar code interpretation method as claimed in claim 1 comprises the step with the above-mentioned scanning of laser scanning Shu Jinhang.
5, bar code interpretation method as claimed in claim 1 comprises the above-mentioned scanning step that makes laser beam aim at a scanning mirror rotation or that wave.
6, bar code interpretation method as claimed in claim 1 further comprises and judges that for the second time numerical data is to determine whether detected bar code symbol is an effective bar code symbol, if, then accept this detected bar code symbol as the bar code symbol that will report by two steps of above-mentioned determination step and above-mentioned second determination step.
7, bar code interpretation method as claimed in claim 6 further comprises:
The striped of a, the detected bar code symbol that is scanned of the representative of the numerical data in memory and the width in gap;
B, after above-mentioned scanning step, the counting of the timer that will successively decrease is initialized as zero;
If it is an effective bar code symbol then the counting of the timer that successively decreases is set to set-point T1 that above-mentioned second determination step of c illustrates, if second decode results that obtains in the time at T1 is with to be stored in result previous in the memory identical then give up second decode results;
If it is an effective bar code symbol that above-mentioned second determination step of d illustrates, the result who checks above-mentioned determination step is within the work range of bar code scanner with the bar code symbol that determines whether to be scanned, if "Yes", then accept this bar code symbol that is scanned as the bar code symbol that will report, if "No" then repeats above-mentioned scanning step.
8, bar code interpretation method as claimed in claim 7 further comprises:
If shown in above-mentioned second determination step of a is an effective bar code symbol, check the bar code symbol that is scanned to determine whether it is a menu bar font code, if "Yes", then above-mentioned threshold value being changed is the new threshold value shown in the above-mentioned menu bar font code, and repeats above-mentioned scanning step.
9, bar code interpretation method as claimed in claim 6 further comprises:
If shown in above-mentioned second determination step of a is an effective bar code symbol, check the bar code symbol that is scanned to determine whether it is a menu bar font code, if "Yes", then above-mentioned threshold value being changed is the new threshold value shown in the above-mentioned menu bar font code, and repeats above-mentioned scanning step.
10, bar code interpretation method as claimed in claim 6 further comprises: according to the requirement that concrete bar code scanning is used, select the step of above-mentioned threshold value.
11, bar code interpretation method as claimed in claim 6 further comprises: change the step of threshold value with scanning bar code menu bar font code, this menu bar font code illustrates an occurrence of threshold value.
12, bar code interpretation method as claimed in claim 6 comprises the step with the above-mentioned scanning of laser scanning Shu Jinhang.
13, bar code method as claimed in claim 12, the step of carrying out above-mentioned scanning comprising the method that makes laser beam aim at scanning mirror rotation or that wave.
14, a kind of bar code decoder is characterized in that, comprising:
A, be used for a bar code scanner of scanning bar code symbol;
B, detected bar code symbol is converted to the device of numerical data, the striped of the bar code symbol that this numerical data representative is scanned and the detection width in gap;
C, judge the device of numerical data, whether too little in order to the striped and the gap detection width of the bar code symbol determining to be scanned, the too little expression bar code symbol of this width is too far away apart from scanner, has surpassed the working range of scanner.The striped of the detected bar code symbol that is scanned and the width in gap and a threshold, with the detection width in the striped of the bar code symbol determining to be scanned and gap whether greater than this threshold value, if just the detection width that above-mentioned determination step indicates striped that the bar code that is scanned answers and gap greater than above-mentioned threshold value then detected bar code be received and will provide report.
15, bar code as claimed in claim 14 is translated device and is further comprised the bar code menu bar font code that the concrete numerical value of threshold value is shown, and uses bar code scanner scanning bar code menu bar font code to change the device of above-mentioned threshold value.
16, bar code decoder as claimed in claim 14 comprises that further second device judging numerical data is in order to determine whether bar code symbol is an effective bar code symbol; If it is an effective bar code symbol that above-mentioned second decision maker illustrates bar code symbol, then detected bar code symbol is accepted as the bar code symbol that a quilt is reported.
17, bar code decoder as claimed in claim 16 further comprises:
Memory storage, the striped of this data represented bar code symbol that is scanned and the detection width in gap of a, storage numerical data;
B, the timer that successively decreases, and the counting of the timer that successively decreases behind bar code scanner scanning bar code symbol is initialized to zero;
C, indicate when being an effective bar code symbol when above-mentioned second decision maker, the counting of down counter promptly is changed to set-point T1, if it is identical with the result who before had been stored in the storer to obtain second decode results in during T1, then second decode results given up;
D, be an effective bar code symbol when above-mentioned second decision maker indicates, the result who checks above-mentioned determination step is to determine that the scanning bar code symbol is whether within work range of bar code scanner, if "Yes", the bar code symbol that then is scanned is as the bar code symbol that will be reported, if "No" is then started above-mentioned bar code scanner and is gone to scan once more.
18, bar code decoder as claimed in claim 16, wherein:
A, be an effective bar code symbol, check the bar code symbol that is scanned to determine whether it is a menu bar font code when above-mentioned second decision maker indicates.Be the shown new threshold value of above-mentioned menu bar font code if "Yes", then above-mentioned threshold value are changed, and the starting of above-mentioned bar code scanner is to obtain another time scanning.
19, bar code decoder as claimed in claim 14, wherein said bar code scanner comprise the laser aid that produces the laser scanning bundle.
20, the bar code decoder of being applied in the patented claim 19, wherein said bar code scanner comprise laser beam scanning mirror that aim at, that swing back and forth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93105530 CN1036808C (en) | 1993-05-11 | 1993-05-11 | Bar code decoder with changable working ranges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93105530 CN1036808C (en) | 1993-05-11 | 1993-05-11 | Bar code decoder with changable working ranges |
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| CN1081009A true CN1081009A (en) | 1994-01-19 |
| CN1036808C CN1036808C (en) | 1997-12-24 |
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| CN 93105530 Expired - Fee Related CN1036808C (en) | 1993-05-11 | 1993-05-11 | Bar code decoder with changable working ranges |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101198961B (en) * | 2005-03-23 | 2011-08-03 | 微扫描系统公司 | Apparatus and process for two-stage decoding of high-density optical symbols |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101001128B (en) * | 2006-06-22 | 2010-05-12 | 华为技术有限公司 | Method and equipment for detecting reliability of decode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101198961B (en) * | 2005-03-23 | 2011-08-03 | 微扫描系统公司 | Apparatus and process for two-stage decoding of high-density optical symbols |
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| CN1036808C (en) | 1997-12-24 |
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