CN108090390B - Bar code splicing algorithm - Google Patents
Bar code splicing algorithm Download PDFInfo
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- CN108090390B CN108090390B CN201711453718.6A CN201711453718A CN108090390B CN 108090390 B CN108090390 B CN 108090390B CN 201711453718 A CN201711453718 A CN 201711453718A CN 108090390 B CN108090390 B CN 108090390B
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- pulse data
- bar code
- laser beam
- decoding
- splicing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/146—Methods for optical code recognition the method including quality enhancement steps
- G06K7/1491—Methods for optical code recognition the method including quality enhancement steps the method including a reconstruction step, e.g. stitching two pieces of bar code together to derive the full bar code
Abstract
The invention discloses a bar code splicing algorithm, which is used for decoding pulse data obtained by two laser beams after splicing the head and the tail of the pulse data; and if the decoding fails, the first pulse data of the pulse data head obtained by the second laser beam returns to the cyclic splicing decoding. When the bar code can not be completely read by the same laser beam due to the fact that the swing speed of the bar code scanning is too high, the capability of code scanning identification can be greatly improved by serially splicing two adjacent laser beams. The obtained second half bar code can not ensure that the first pulse data of the head is effective, or the bar codes obtained by two adjacent laser beams are overlapped, one pulse data is sequentially subtracted from the second half bar code and then spliced until the decoding is successful. Based on the swing speed of the hand, the invention can completely solve the problem that a complete bar code data can be accurately obtained in one scanning process, and the user does not need to scan for many times, thereby improving the user experience.
Description
Technical Field
The invention relates to a bar code scanning method, in particular to a bar code splicing algorithm for a multi-line scanning platform.
Background
The multi-line scanning platform is used for folding an original laser beam into a plurality of laser beams by principles such as optical angle reflection and the like, and each laser beam is the road strength of the same scanning point. So that the bar code can be read only by covering any one laser beam with the bar code. But since the laser scanning the barcode must be a left-to-right or right-to-left process. In the following description of the invention a fixed direction is chosen, i.e. scanning from left to right. When the light spot enters the bar code from the silent area on the left side of the bar code and then is scanned out from the silent area on the right side of the bar code, a finished scanning process is finished.
Generally, the same laser beam must complete the process of entering from the left silence region and then exiting from the right silence region to obtain a complete signal for decoding. However, since the multi-line scanning platform is a fast scanning device, a user may be required to identify a barcode by flashing the barcode in front of the scanning device. So, if the user's scan speed is fast enough, two cases may result: firstly, the method comprises the following steps: although the laser scanning point enters from the left silent area, the user slides too fast, and the laser scanning point is not scanned from the right silent area completely, so that the laser scanning point is obtained as the first half of the bar code. Secondly, the method comprises the following steps: due to the randomness of the sliding entry of the bar code, the light spot may enter from the middle of the bar code and be swept out from the right silent area of the bar code, thus obtaining the latter half of the bar code. In both cases, normal bar codes cannot be analyzed, resulting in poor user experience performance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a barcode splicing algorithm.
The invention relates to a barcode splicing algorithm, which is characterized by comprising the following steps of:
A. identifying a first laser beam (d 1) that scans through the left silent region;
B. identifying a second laser beam (d 2) that scanned through the right silent region;
C. splicing the tail part of the pulse data obtained by the first laser beam with the head part of the pulse data obtained by the second laser beam;
D. decoding the phase-spliced pulse data;
E. if the decoding is successful, uploading the decoded data and ending; if the decoding fails, the next step is carried out;
F. deleting the first pulse data of the head of the pulse data obtained by the second laser beam, and then returning to the step C.
The barcode splicing algorithm has the advantage that when the barcode scanning swing speed of a user is too high and the same laser beam cannot completely read the barcode, the barcode scanning identification capability can be greatly improved by serially splicing two adjacent laser beams. Generally, the moving speed of the hands is much lower than that of the scanning speed, so that the complete bar codes can be directly obtained by direct splicing. However, considering that the obtained second half bar code can not ensure that the first pulse data of the head part is valid, or the bar codes obtained by two adjacent laser beams are overlapped, one pulse data is sequentially subtracted from the second half bar code and then spliced until the decoding is successful. Based on the swing speed of the hand, the invention can completely solve the problem that a complete bar code data can be accurately obtained in one scanning process, and the user does not need to scan for many times, thereby improving the user experience.
Drawings
FIG. 1 is a schematic view of two laser beams respectively obtaining partial barcodes.
Detailed Description
As shown in fig. 1, when no laser beam scans a barcode completely, the barcode stitching algorithm according to the present invention stitches the barcode according to the following method steps. First, the first laser beam d1 scanned through the left silent zone is identified, and then the second laser beam d2 scanned through the right silent zone is identified. Generally, the swinging speed of the human hand is not fast, so the first laser beam and the second laser beam are adjacent laser beams, but for more accurate decoding, the judgment of whether the two laser beams are adjacent or not is carried out. If the laser beams are adjacent, splicing the tail part of the pulse data obtained by the first laser beam with the head part of the pulse data obtained by the second laser beam; and returning to rescan if the adjacent is not. Decoding the phase-spliced pulse data; if the decoding is successful, uploading the decoded data and ending; if the decoding fails, deleting the first pulse data at the head of the pulse data obtained by the second laser beam, and then returning to the splicing step.
Due to the uncertainty of the speed of the human hand and the uncertainty of the position of the laser point entering the barcode, the pulse data obtained by the first laser beam d1 and the pulse data obtained by the second laser beam d2 may overlap, and the problem can still be solved by the barcode splicing method.
Suppose that: the data length of the barcode is 10 bits and the pulse data content of the barcode is L = 0123456789. The first laser beam d1 scans through the left quiet zone to obtain pulse data d1=012345, and the second laser beam d2 scans through the right quiet zone to obtain pulse data d2= 456789. Splicing the pulse data tail obtained by the first laser beam d1 with the pulse data head obtained by the second laser beam d2 results in d1+ d2=012345456789 (12 bits).
The newly spliced bar code digits are not aligned with the original bar code digits, and decoding is not successful. Therefore, the first pulse data at the head of the pulse data obtained by the second laser beam d2 is deleted, the second laser beam d2=56789 is obtained after the deletion, and the new second laser beam d2 is returned to the splicing step for splicing and decoding again.
The resulting length after splicing is still larger than the original barcode length (d 1+ d2=01234556789, 11 bits), so the first pulse data of the pulse data header obtained by the second laser beam d2 is deleted again. And performing a new cycle of barcode splicing to obtain new barcode pulse data d1+ d2= 0123456789. The number of bits is the same as that of the original bar code, and the pulse data consistent with the original bar code is obtained after the decoding is successful, so that the whole decoding process is completed.
It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.
Claims (2)
1. A barcode splicing algorithm is characterized by comprising the following steps:
A. identifying a first laser beam (d 1) that scans through the left silent region;
B. identifying a second laser beam (d 2) that scanned through the right silent region;
C. splicing the tail part of the pulse data obtained by the first laser beam with the head part of the pulse data obtained by the second laser beam;
D. decoding the phase-spliced pulse data;
E. if the decoding is successful, uploading the decoded data and ending; if the decoding fails, the next step is carried out;
F. deleting the first pulse data of the head of the pulse data obtained by the second laser beam, and then returning to the step C.
2. The barcode stitching algorithm of claim 1, wherein step C determines whether the first laser beam and the second laser beam are adjacent to each other before stitching, if so, stitching is performed, and if not, returning is performed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711453718.6A CN108090390B (en) | 2017-12-28 | 2017-12-28 | Bar code splicing algorithm |
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| CN201711453718.6A CN108090390B (en) | 2017-12-28 | 2017-12-28 | Bar code splicing algorithm |
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| CN108090390A CN108090390A (en) | 2018-05-29 |
| CN108090390B true CN108090390B (en) | 2021-01-26 |
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| CN201711453718.6A Active CN108090390B (en) | 2017-12-28 | 2017-12-28 | Bar code splicing algorithm |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1630717A2 (en) * | 1998-03-26 | 2006-03-01 | Symbol Technologies, Inc. | One piece optical assembly for low cost optical scanner |
| CN206133599U (en) * | 2016-08-29 | 2017-04-26 | 广州卓德信息科技有限公司 | Two -dimensional code scanner with pilot lamp |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034072A (en) * | 2009-09-25 | 2011-04-27 | 神基科技股份有限公司 | Method for identifying barcode image |
| CN102629312B (en) * | 2012-01-10 | 2014-08-13 | 广州优库电子有限公司 | Omnidirectional multiple line laser bar code reading device and method thereof |
| US9373018B2 (en) * | 2014-01-08 | 2016-06-21 | Hand Held Products, Inc. | Indicia-reader having unitary-construction |
| CN106203216B (en) * | 2016-06-30 | 2018-11-09 | 杭州晟元数据安全技术股份有限公司 | A kind of bar code decoding method |
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- 2017-12-28 CN CN201711453718.6A patent/CN108090390B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1630717A2 (en) * | 1998-03-26 | 2006-03-01 | Symbol Technologies, Inc. | One piece optical assembly for low cost optical scanner |
| CN206133599U (en) * | 2016-08-29 | 2017-04-26 | 广州卓德信息科技有限公司 | Two -dimensional code scanner with pilot lamp |
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