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Method for cutting portable data file (PDF) 417 standard two-dimensional bar code image

A PDF417, two-dimensional barcode technology, applied in the field of digital image processing, can solve the problems of increasing recognition operation time and reducing algorithm efficiency

Inactive Publication Date: 2011-09-14
MAOMING POLYTECHNIC
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Problems solved by technology

This will increase the recognition operation time and reduce the efficiency of the algorithm

Method used

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  • Method for cutting portable data file (PDF) 417 standard two-dimensional bar code image
  • Method for cutting portable data file (PDF) 417 standard two-dimensional bar code image
  • Method for cutting portable data file (PDF) 417 standard two-dimensional bar code image

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[0131] Input a standard PDF417 standard two-dimensional barcode image with a resolution of 640×480, which is normal, that is, without tilt, distortion, serious stain or loss (this invention is aimed at normal, or normal PDF417 standard obtained after image preprocessing Two-dimensional barcode image cutting method).

[0132] Since the input image is a color image, and the PDF417 standard two-dimensional barcode image is only black and white, it is necessary to transform the color space of the image, use YCbCr color difference to describe, and take out the brightness component and perform binarization, such as figure 2 shown;

[0133] The input image may contain surrounding white areas. In order to facilitate subsequent operations, it is necessary to remove the white areas around the image and cut out an image that only contains the code area, such as image 3 shown;

[0134] Using the Sobel gradient operator ( Figure 4 As shown in (a), perform horizontal edge detection to...

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Abstract

The invention discloses a method for cutting a portable data file (PDF) 417 standard two-dimensional bar code image based on a projection mode by using image profile information. The method comprises the following steps of: inputting the normal PDF417 standard two-dimensional bar code image, carrying out grey processing, and binarizing a grey image by using a self-adaptive global threshold value to obtain a two-dimensional code binary image; cutting two-dimensional code areas of the processed image to obtain the image which only has the code areas; identifying the obtained two-dimensional code image, detecting coordinates of partition lines of each row, and calculating row height; detecting whether the two-dimensional code image is inversed, cutting each code word image sequentially from top to bottom and from right to left according to the detected coordinates of the partition lines of the row, the row height, the coordinates of the partition lines of a line, and line width; and identifying code words from right to left reversely, and converting the code words into corresponding code word sequences. By the method, each code word can be cut accurately in the situation that the image is partially contaminated, lost or even inclined slightly at an angle of less than 0.1 degree. The method is high in robustness and high in reliability.

Description

technical field [0001] The invention discloses a method applied to PDF417 standard two-dimensional barcode image cutting. Specifically, it designs a method that utilizes image contour information and combines projection algorithm and Sobel edge detection algorithm to detect each row and column dividing line and cut and translate code words. The method belongs to the technical field of digital image processing. Background technique [0002] Two-dimensional barcode is a coding technology based on optical image reading. It has the advantages of large storage capacity, high cost performance, and convenient data collection and reading. This technology involves optical, electromechanical, and printing, information security, identification and other technical fields. As a new information storage and transmission technology, PDF417 two-dimensional barcode has been widely concerned by the international community since its birth. After several years of hard work, it has been widely u...

Claims

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Application Information

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IPC IPC(8): G06K7/10
Inventor 陈凡健王松波
Owner MAOMING POLYTECHNIC
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