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Data Processing Device And Method Used For Processing 2d Color Barcodes

A data processing equipment and barcode technology, applied in the direction of instruments, induction record carriers, electromagnetic radiation induction, etc.

Active Publication Date: 2017-01-04
KONICA MINOLTA LAB U S A INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, various factors limit how small the unit can be
[0005] When 2D color barcodes are printed on paper or displayed on a display screen (such as that of a mobile device) and read by a camera-based barcode reader (as opposed to a flatbed scanner), perspective projection and uneven illumination can Challenges to Decoding Barcodes

Method used

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  • Data Processing Device And Method Used For Processing 2d Color Barcodes
  • Data Processing Device And Method Used For Processing 2d Color Barcodes
  • Data Processing Device And Method Used For Processing 2d Color Barcodes

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Embodiment Construction

[0019] One aspect of the invention is the layout design of a 2D color barcode to be printed on a medium or displayed on the screen of a mobile device. Another aspect of the invention is a decoding process and algorithm suitable for decoding 2D color barcodes from images captured via a camera. The design of the 2D color barcode incorporates features to facilitate the processing and decoding of the barcode image captured from the camera.

[0020] figure 1 Depicted is the layout of an exemplary colored barcode according to an embodiment of the invention. A colored barcode comprises a plurality of data cells 11 forming a two-dimensional array, each cell having one of a plurality of colours. In a preferred embodiment, the plurality of colors are cyan (C), magenta (M), white (W) (ie, not printed) and black (K), and each cell can represent 2 bits of information. CMYK are the primary colors used in a typical printer, each of CMYK is printed with one colored ink, and is called a col...

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Abstract

The present invention relates to a data processing device and method used for processing 2D color barcodes, and provides a processing method for a color barcode image captured by a camera or a barcode reader. The barcode includes color data cells and multiple large black locators which are located at the four corners of the barcode, along the four borders, and inside the barcode forming an array. The locators are firstly identified from a grayscale version of the barcode image by using multiple binarization technique to ensure that all locators are identified. Perspective correction and illumination correction may be applied to the barcode image by using the identified locators.

Description

technical field [0001] The present invention relates to the design and decoding of two-dimensional (2D) color barcodes, and more particularly, the invention relates to the design and decoding of 2D color barcodes for camera-based applications. Background technique [0002] A barcode is an optical, machine-readable representation of data. A 2D color barcode is formed of small square or rectangular cells arranged two-dimensionally (for example, in both directions, horizontal and vertical), and uses one color for each cell. Different colors represent different data values. The relationship between the data capacity of a barcode and the number of cells and colors can be expressed as: [0003] Data capacity = (number of units) × log 2 (number indicated by color) [0004] Barcode designs that use small cell sizes and more color representations can achieve relatively high data capacities in a given area. However, various factors limit how small the cells can be. [0005] When...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/14
CPCG06K7/1417G06K7/1443G06K7/1456
Inventor 方刚
Owner KONICA MINOLTA LAB U S A INC
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