PDF417 bar code decoding chip

Abstract

The invention provides a PDF417 bar code decoding chip which comprises a scanning module, a boundary identification module, a direction identification module, a bar space boundary processing module, a symbolic parameter identification module, a sign character acquisition module and a decoding module, wherein the scanning module is used for generating scanning coordinates; the boundary identification module is used for reading a bar code image according to the scanning coordinates and calculating pixel points of the read image so as to acquire bar space boundary points of the bar code image; the direction identification module is used for calculating a bar code direction according to the bar space boundary points acquired by the boundary identification module; the bar space processing module is used for processing the bar code image according to the bar code direction so as to acquire a bar space boundary of the bar code image; the symbolic parameter identification module is used for identifying the symbolic parameter of a bar code according to the bar space boundary so as to acquire the symbolic parameter; the sign character acquisition module is used for calculating according to the bar space boundary and the symbolic parameter to obtain a sign character; and the decoding module is used for converting the sign character into bar code information. The PDF417 bar code decoding chip adopts a hardware pipeline structure, is suitable for carrying out pipeline operations and parallel processing on bar code images and has high processing speed.

Description

【Technical field】 [0001] The invention relates to the technical field of barcode identification, in particular to a PDF417 barcode decoding chip. 【Background technique】 [0002] Bar code technology is an emerging technology developed on the basis of computer technology and information technology that integrates coding, printing, identification, data collection and processing. Barcode technology is widely used in business, library management, warehousing, post and telecommunications, transportation and industrial control due to its advantages of fast, accurate, reliable and low cost, and is bound to play an important role in the emerging "Internet of Things" applications. role. [0003] Currently widely used barcodes include one-dimensional barcodes and two-dimensional barcodes. A one-dimensional barcode, also known as a linear barcode, is composed of multiple "bar" and "space" units arranged in parallel, and the barcode information is expressed by the different widths and ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defect that the decoding device in the prior art relies on the user to correctly sense the direction of the barcode through the scanning unit, and cannot adjust the decoding direction according to the direction of the barcode, the present invention provides a PDF417 barcode decoding chip, which can correctly identify the blank information of the barcode , to improve the success rate of decoding

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