Barcode identification method for improving decoding reliability by correcting image distortion

Patent metadata

Field	Value
Publication number	US-10460142-B2
Application number	US-201816114230-A
Country	US
Kind code	B2
Filing date	Aug 28, 2018
Priority date	Sep 8, 2017
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A barcode identification method includes generating a binarization barcode by using a binarization process from a sampled barcode, acquiring a first region from the binarization barcode, acquiring a first narrow element width from the first region, acquiring a second region from the binarization barcode, acquiring a second narrow element width from the second region, generating an extension region by extending the second region when the second narrow element width is smaller than the first narrow element width, generating a plurality of binarization sequences corresponding to the extension region, decoding at least one of the binarization sequences for generating at least one decoded sequence by using a lookup table, and verifying the at least one decoded sequence for generating a verified sequence by using a checksum code.

First claim

What is claimed is:

1. A barcode identification method comprising:
generating a binarization barcode by using a binarization process from a sampled barcode;
acquiring a first region from the binarization barcode;
acquiring a first narrow element width from the first region;
acquiring a second region from the binarization barcode;
acquiring a second narrow element width from the second region;
generating an extension region by extending the second region when the second narrow element width is smaller than the first narrow element width;
generating a plurality of binarization sequences corresponding to the extension region;
eliminating a binarization sequence of the plurality of binarization sequences when at least one value of the binarization sequence is inconsistent with the first narrow element width;
decoding at least one of the binarization sequences for generating at least one decoded sequence by using a lookup table; and
verifying the at least one decoded sequence for generating a verified sequence by using a checksum code.

2. The method of claim 1 , wherein the first region and the second region are non-overlapped, the binarization barcode comprises a plurality of first value regions and a plurality of second value regions, and the plurality of first value regions and the plurality of second value regions correspond to different gray levels.

3. The method of claim 2 , further comprising:
acquiring a format of a barcode to be sampled;
wherein the first region comprises N first value regions and M second value regions, the N first value regions and the M second value regions are consistent with the format, and N and M are two positive integers.

4. The method of claim 2 , wherein generating the extension region by extending the second region when the second narrow element width is smaller than the first narrow element width comprises:
generating the extension region by adding a first value region and a second value region to the second region.

5. A barcode identification method comprising:
generating a binarization barcode by using a binarization process from a sampled barcode;
acquiring a first region from the binarization barcode;
acquiring a first narrow element width from the first region;
acquiring a second region from the binarization barcode;
acquiring a second narrow element width from the second region;
generating an extension region by adding a first value region and a second value region to extend the second region when the second narrow element width is smaller than the first narrow element width;
converting the second value region of the extension region to the first value region of the extension region when a width of the second value region of the extension region is equal to the second narrow element width and the second value region of the extension region is located between two consecutive first value regions;
generating a plurality of binarization sequences corresponding to the extension region;
decoding at least one of the binarization sequences for generating at least one decoded sequence by using a lookup table; and
verifying the at least one decoded sequence for generating a verified sequence by using a checksum code;
wherein the first region and the second region are non-overlapped, the binarization barcode comprises a plurality of first value regions and a plurality of second value regions, and the plurality of first value regions and the plurality of second value regions correspond to different gray levels.

6. A barcode identification method comprising:
generating a binarization barcode by using a binarization process from a sampled barcode;
acquiring a first region from the binarization barcode;
acquiring a first narrow element width from the first region;
acquiring a second region from the binarization barcode;
acquiring a second narrow element width from the second region;
generating an extension region by adding a first value region and a second value region to extend the second region when the second narrow element width is smaller than the first narrow element width;
converting the first value region of the extension region to the second value region of the extension region when a width of the first value region of the extension region is equal to the second narrow element width and the first value region of the extension region is located between two consecutive second value regions;
generating a plurality of binarization sequences corresponding to the extension region;
decoding at least one of the binarization sequences for generating at least one decoded sequence by using a lookup table; and
verifying the at least one decoded sequence for generating a verified sequence by using a checksum code;
wherein the first region and the second region are non-overlapped, the binarization barcode comprises a plurality of first value regions and a plurality of second value regions, and the plurality of first value regions and the plurality of second value regions correspond to different gray levels.

7. The method of claim 1 , further comprising:
adjusting number of first value regions and number of second value regions of the extension region to be consistent with a format of a barcode to be sampled;
wherein the binarization sequences are generated by combining the first value regions and the second value regions of the extension region.

8. The method of claim 1 , wherein the first region is a barcode start pattern region, and the second region is a barcode data region.

9. The method of claim 1 , further comprising:
scanning a barcode to generate the sampled barcode by using a line sensor array.

Assignees

• Qisda Corp

Inventors

• Kuo Jun-Hao

Classifications

• G06K19/06028

  using bar codes · CPC title

• G06K7/1495

  the method including an image compression step · CPC title

• G06K7/1473 Primary

  error correction · CPC title

• G06K7/1413

  1D bar codes · CPC title

• G06T5/003

  Physics · mapped topic