METHOD OF BARCODE TEMPLATING FOR ENHANCED DECODING PERFORMANCE

Abstract

An exemplary method of decoding a barcode uses a barcode template of known fixed fields in the barcode to enhance error correction in decoding of the barcode. A barcode having encoded data is scanned with an exemplary electronic device including a barcode scanner, a memory, and a barcode template stored in the memory. The barcode template includes fixed data fields and variable data fields. The barcode's encoded data are sampled into a codeword array, and a barcode template that matches the format of the scanned barcode is selected. Typically, error correction is then performed on the codeword array, and the error-corrected codeword array is then outputted.

Description

FIELD OF THE INVENTION

The present specification relates to scanning and decoding of printed barcodes by electronic devices, such as portable data terminals, personal digital assistants, and computers. More particularly, the specification is directed to a method of barcode templating for enhanced decoding performance.

BACKGROUND

A common problem in bar code design, and particularly with PDF417 formatted barcodes, is insufficient error correction codes for the size of the barcode. This lack of sufficient error correction affects the readability of the barcode. The issue is further exacerbated by printing errors and/or damage to the barcode itself, which consequently can render these barcodes unreadable. Accordingly, there is a need to enhance the readability of barcodes that lack sufficient error correction.

SUMMARY

In one aspect, a method of decoding a barcode uses a barcode application specification that defines one or more bar code templates used in an application. A barcode template enhances error correction by storing any known fixed data used in every bar code matching that particular barcode template. A barcode having encoded data is scanned with an electronic device having a barcode scanner, a memory, and one or more barcode templates stored in the memory. A barcode template includes fixed fields of data common to every bar code matching that particular template and open fields indicating where the data are variable and unique for every bar code matching that particular template. The barcode scanner further includes barcode scanning software operative to apply a barcode template to correct the fixed field areas with the known data. This reduces the information reliant on the error correction, if error correction is present in the particular code, and enhances the error correction of the barcode.

In use, a barcode that is formatted according to one of the templates from the barcode application specification is scanned, and the scanned data is stored in a codeword array. A barcode template that matches the format of the scanned barcode is then selected. The barcode template is applied to the scanned barcode by using the fixed data fields of the barcode template to replace the scanned codeword data in the codeword array, thereby creating a corrected codeword array. If error correction is used in the particular symbology, error correction is then performed on the corrected codeword array. If the error correction process succeeds, the resulting error-corrected codeword array is then used to generate an output message.

One exemplary embodiment of the method described herein relieves some of the burden of the error correction in these codes, because the fixed data fields of the codeword data are guaranteed to be accurate and thus only the variable information in the barcode must be checked. By reducing the data that the error correction must accommodate, this exemplary method provides significant benefits where limited error correction affects the readability of certain barcodes.

The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment will now be described further by way of example with reference to the following examples and figures, which are intended to be illustrative only and not limiting upon the scope of the disclosure.

FIG. 1A is a perspective view of an exemplary embodiment of an electronic device that includes software operative for enhanced decoding performance of a barcode using a barcode template.

FIG. 1B is a block diagram of an exemplary embodiment of an electronic device that includes software operative for enhanced decoding performance of a barcode using a barcode template;

FIG. 2 is a view of a prior art two-dimensional barcode formatted in PDF417 format.

FIG. 3A is a view of a prior art two-dimensional barcode in a Data Matrix.

FIG. 3B is a view of a prior art two-dimensional barcode in MaxiCode format.

FIG. 3C is a view of a prior art two-dimensional barcode in Aztec Code format.

FIG. 3D is a view of a prior art two-dimensional barcode in QR Code format.

FIG. 3E is a view of a prior art two-dimensional barcode in Semacode Data Matrix format;

FIG. 3F is a view of a prior art two-dimensional barcode in High Capacity Color Barcode format.

FIG. 4 is an illustration of an exemplary embodiment of a barcode template according to the method described herein.

FIG. 5 is a flowchart illustrating an exemplary embodiment of the method of decoding a barcode described herein.

FIG. 6 is a flowchart illustrating an exemplary method of decoding a barcode using an electronic device.

DETAILED DESCRIPTION

Generally, the present method of decoding a barcode uses a barcode template of known fixed fields in the barcode to enhance error correction in decoding of the barcode.

A barcode having encoded data is scanned with an exemplary electronic device including a barcode scanner, a memory, and a barcode template stored in the memory. The barcode template includes fixed data fields (e.g., mask fields) and variable data fields (e.g., open fields). The barcode's encoded data are sampled into a codeword array, and a barcode template that matches the format of the scanned barcode is selected. The template is applied to the codeword array to correct (e.g., to autocorrect) the fixed data fields of the codeword array. That is, the barcode template is applied to the codeword array to correct the areas in the codeword array that correspond to the fixed data fields of the template. Typically, error correction is then performed on the codeword array, and the error-corrected codeword array is then outputted.

Referring to FIGS. 1A and 1B, an exemplary electronic device is shown and illustrated at 100. The electronic device includes a barcode scanner 102, a memory 104, and a barcode template 106 stored in the memory 104. A processor 108 is operative to run barcode scanning software (or firmware) 110 also stored on the electronic device 100.

Although an exemplary handheld scanner with a pistol grip 102 is shown, the electronic device 100 can have several different form factors, such as in-counter scanners, hands-free scanners, healthcare mobile computers, industrial hazardous location mobile computers, industrial barcode scanners, wireless barcode scanners, industrial cold storage mobile computers, and non-mobile computer scanner solutions. Accordingly, the handheld scanner exemplified in FIG. 1 is by way of example and not of limitation.

Referring to FIG. 2, an exemplary two-dimensional barcode is shown in PDF417, a stacked linear format that can support three to ninety rows of encoded information. Each row of the barcode includes a start pattern, a left row indicator, data codewords, a right row indicator, and a stop pattern. The left row indicator includes additional information, such as error correction information and the row number. The right row indicator may include additional information about the row. PDF417 is further described in ISO standard 15438, which is hereby incorporated by reference in its entirety.

Referring to FIGS. 3A-F, other configurations of two-dimensional barcodes may be used with the disclosed method, including matrix barcodes such as Data Matrix format (FIG. 3A), MaxiCode Format (FIG. 3B), Aztec Code format (FIG. 3C), QR Code format (FIG. 3D), Semacode Data Matrix format (FIG. 3E), and Microsoft High Capacity Color Format (FIG. 3F), as well as variations thereof. Data Matrix may be in Data Matrix version ECC 200 format or versions ECC 000-140 format as desired.

Although this exemplary method is described in relation to several known two-dimensional barcode technologies, the method applies to many kinds of information bearing indicia, including linear bar codes (e.g., Code 39, Code 128, etc.), stacked linear bar codes (e.g., PDF417, Codablock, etc.) two-dimensional matrix symbologies (e.g., Aztec, QR Code, etc.), postal codes (e.g., PostNet, Intelligent Mail bar code, etc.), optical character recognition, and other information bearing indicia symbologies. The examples of various barcodes in FIGS. 2 and 3A-F and described herein are provided by way of example and not of limitation.

Regardless of which barcode is used, a user who develops an application that involves reading a barcode—especially larger scale stacked codes like PDF417 or 2D matrix codes—will include a barcode application specification, which contains barcode templates defining the fields of the one or more kinds of barcodes. For example, these templates may include fixed data fields like headers, field names, separators, or other like data that do not vary from barcode to barcode. These templates may also include variable data fields. The variable data fields defined in the barcode specification, such as names, addresses, customer numbers, lot numbers, manufacturing date, and/or other variable data fields, make up only part of the total information in the barcode templates of the barcode application specification.

Referring to FIG. 4, an exemplary barcode template is shown generally at 400. The barcode template 400 include fixed data fields 402, which pertain to the fixed fields of a barcode used in an application as per the barcode application specification, and variable data fields 404, which are indicated here by “#” sign, although other symbols may be used. The variable data fields pertain to the data that will vary in the barcodes used in an application as per the barcode application specification.

FIG. 5 is a flowchart illustrating an exemplary method embodiment. The barcode template is loaded onto the electronic device via a configuration command, SDK call, or some other kind of entry prior to scanning. This barcode template is stored in memory of the electronic device and used during barcode decoding. There could be one or more different barcode templates stored for application to various formats of various symbologies, which the user could scan.

The barcode is scanned with the barcode scanner 102 of the electronic device 100. The barcode includes data encoded according to the barcode application specification. The electronic device then samples or otherwise extracts the codeword data of the scanned barcode into a codeword array.

A barcode application specification may have several templates defined, all of which may be stored in the memory 104 of electronic device 100. When deciding which template to apply to a specific set of codeword data, either all codes of a specific symbology could have the template applied or a decision of when to apply the template could be made based on dimensions of the bar code, error correction levels, or a comparison of the raw data against the template. Where the symbology used includes error correction, the template may also be applied before or after an initial error correction attempt on the sampled data.

The barcode template 400 is applied to the sampled codeword data by overwriting the known information (i.e., fixed data fields 402) into the corresponding data locations of the raw data codeword array, thus ensuring the accuracy of the fixed data fields of the codeword array. The data locations of the codeword array corresponding to the variable data fields of the barcode template are not disturbed. These actions are applied according to the template fields 404 of the barcode template 400.

Because the fixed data fields of the codeword array are correct, error correction, if supported by the symbology used, is only needed for the areas of the code with variable data fields, thus increasing readability of these barcodes. When the error correction of the codeword array succeeds, the resulting error-corrected codeword array is then used to generate an output message.

FIG. 6 is a flowchart illustrating another exemplary method embodiment. As shown in FIG. 6, the user would have an electronic device preloaded with barcode templates and firmware operative to apply the barcode template to the scanned barcode.

In an exemplary embodiment, the method efficiently processes more advanced kinds of barcodes, such as PDF417 and Data Matrix, that employ encodation modes as per the specific barcode encodation specification for a given symbology (e.g., ISO standard 15438 for PDF417). The purpose of these encodation modes is to compress as much data into as few bytes as possible.

Those having ordinary skill in the art will understand that a bar code message itself is different from the physical values of codewords that are stored in the bar code. For bar codes that do not have encoding modes, a bar code message (e.g., 123456) would have only one way to be encoded. In contrast, bar codes with encodation modes may encode that in a specified numeric compaction mode (e.g., only values 0-9) or text compaction mode (e.g., printable ASCII characters with a few special characters), and perhaps in other modes (e.g., byte modes). To apply the barcode template to codewords to facilitate decoding of barcode employing a barcode encodation specification, one should know more about the bar code than just the data or the template of the data. If the encodation mode(s) for how the data are encoded is unknown, how to apply the barcode template to a specific bar code to decode the bar code is uncertain.

Actual encoded codeword values, which may include mode information and a compressed version of the actual data, can seed the barcode template instead of basing the barcode template on the specific output data. By way of illustration, a general PDF417 templating system can be established to template the encoded data instead of the message data, thereby resulting in a general-rules template for PDF417 that can apply to every PDF417 barcode. The PDF417 specification requires that a barcode begin with a length codeword (i.e., the first data codeword indicates the number of data codewords in the entire data message). This information is redundant, however, from the height, width, and error-correction level of the barcode, which are already encoded in the “row indicators.” This information is known without considering the specific codeword data encoded. Thus, if the first codeword does not comport with what the data length determined from the redundant data (e.g., height, width, and error-correction level of the barcode), then it is probable that the codeword is wrong, in which case the correct codeword value can be restored.

Furthermore, PDF417 use a format for “padding” information at the end of a message (i.e., a set of empty data codewords referred to as “pad codewords”), which are intended to complete the physical matrix. Although the pad codewords have no message value associated with them, pad codewords are included in the error correction calculation, and getting them wrong incurs error-correction penalties. A section of pad codewords has a distinct signature, indicating that every codeword after it in the data codewords is a pad codeword, regardless of the actual codeword values.

Processing these advanced barcodes using templates associated with a barcode encodation specification is especially useful when error-correction of sampled, encoded data has failed. Attempting error correction on the sampled data is advisable, for example, in case a barcode fails to adhere to the barcode encodation specification established for a given symbology.

In summary, it can be appreciated from the foregoing description and illustrations that the disclosed method of decoding enhances the readability of barcodes lacking sufficient error correction. By applying a template to the decoded codeword array and automatically replacing the known fixed fields with the fixed data, the known fixed fields are guaranteed to be accurate, leaving the subsequent error correction steps to focus upon the variable data fields. Not only is the decoded barcode more accurate, but fewer error-correction processing steps results in faster decoding. For these reasons, the exemplary method of decoding a barcode using a barcode template is believed to represent significant advancements having substantial commercial merit.

To supplement the present disclosure, this application incorporates entirely by reference the following patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation.

Claims

1. A method of decoding a barcode, comprising: scanning a barcode having encoded data;sampling the encoded data in the barcode into a codeword array;selecting a barcode template having fixed data fields and variable data fields; andapplying the barcode template to the codeword array to correct the areas in the codeword array that correspond to the fixed data fields of the template.

2. The method of claim 1, comprising: performing error correction on the codeword array; andoutputting the error-corrected codeword array, whereby readability of the barcode is enhanced.

3. The method of claim 1, wherein the barcode template is defined by a barcode application specification.

4. The method of claim 1, wherein the barcode template is defined by a barcode encodation specification.

5. The method of claim 1, wherein the fixed data fields include headers, field names, and separators.

6. The method of claim 1, wherein the variable data fields include customer names, customer addresses, customer numbers, lot numbers, and/or manufacturing date.

7. The method of claim 1, comprising applying the barcode template after first determining dimensions of the barcode.

8. The method of claim 1, comprising applying the barcode template after first determining error correction levels of the barcode.

9. The method of claim 1, comprising applying the barcode template after first comparing the codeword array to the barcode template.

10. The method of claim 1, wherein the barcode is a linear 1D barcode.

11. The method of claim 1, wherein the barcode is a two-dimensional barcode.

12. The method of claim 11, wherein the barcode is in PDF417 format.

13. The method of claim 11, wherein the barcode is in a 2D matrix symbology.

14. The method of claim 13, wherein the barcode is in Data Matrix format.

15. The method of claim 1, wherein the barcode is in Data Matrix ECC 200 format, Data Matrix 000-140 format, Aztec Code format, QR Code format, or High Capacity Color Barcode format.

16. A method of decoding a barcode with an electronic device to enhance barcode readability, comprising: providing an electronic device having a barcode scanner, a memory, and a barcode template stored in the memory, the barcode template including fixed data fields and variable data fields;providing barcode scanning software on the electronic device, the barcode scanning software operative to: scan a barcode having encoded data;sample the encoded data of the barcode into a codeword array;select a barcode template matching the format of the scanned barcode; andapply the template to the codeword array to correct the areas in the codeword array that correspond to the fixed data fields of the template.

17. The method of claim 16, wherein the barcode scanning software is further operative to perform error correction on the codeword array and to output the error-corrected codeword array.

18. The method of claim 17, wherein the barcode scanning software is further operative to apply the barcode template after first determining dimensions of the barcode.

19. The method of claim 17, wherein the barcode scanning software is further operative to apply the barcode template after first determining error correction levels of the barcode.

20. The method of claim 16, wherein the barcode scanning software is further operative to apply the barcode template after first comparing the codeword array to the barcode template.

21. The method of claim 16, wherein the barcode is a two-dimensional barcode.

22. The method of claim 21, wherein the barcode is in PDF417 format.

23. The method of claim 21, wherein the barcode is in a matrix.

24. The method of claim 23, wherein the barcode is in Data Matrix format.

25. The method of claim 16, wherein the barcode is a two-dimensional barcode is in Data Matrix ECC 200 format, Data Matrix 000-140 format, Aztec Code format, QR Code format, or High Capacity Color Barcode format.