Maxi Code bar code decoding chip and decoding method thereof

Abstract

The invention provides a Maxi Code bar code decoding chip. A feature searching unit is used for searching a position detection figure in a bar code image to determine the pixel coordinate of the position detection figure. A module size acquiring unit is used for acquiring a module size according to the pixel coordinate of the position detection figure. A positioning feature acquiring unit is used for searching a positioning cluster on the bar code image to acquire the pixel coordinate of the positioning cluster and a module coordinate and determine the directions of bar codes. A mode bit acquiring unit is used for searching the mode bits of the bar codes. A module information processing unit is used for calculating a gray value matched with each module of a Maxi Code. A binaryzation unit is used for carrying out binaryzation on the modules. A code word extracting unit is used for extracting code words by using the binaryzated modules. An error-correcting and decoding unit is used for carrying out error-correcting and decoding treatment on the code words. The invention also provides a Maxi code decoding method. The Maxi Code bar code decoding chip and the decoding method thereof in the invention can ensure the rapid and smooth conduction of a Maxi Code decoding process.

Description

【Technical field】 [0001] The invention relates to the technical field of barcode identification, in particular to a Maxi Code barcode decoding chip and a decoding method thereof. 【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 expre...

AI Technical Summary

Problems solved by technology

One-dimensional barcodes only express information in one direction (generally the horizontal direction), but do not express any information in the vertical direction, so the information capacity and space utilization are low, and the barcode cannot be recognized after it is defaced

[0004]The two-dimensional barcode is composed of black and white specific geometric figures distributed in the two-dimensional direction according to certain rules, which can express information in the two-dimensional direction, so the information The capacity and space utilization are low, and it has a certain verification function

The problem of this system is: one, processing speed is slow, and this system needs to write a series of programs that realize decoding algorithm in the microprocessor, and single processor can only carry out decoding processing at the same time for a specific type of barcode format, and processor Only one operation can be processed in one clock cycle, and the software processing also determines the single-flow characteristic of the decoding process. It is difficult to realize the pipeline operation and parallel processing of the barcode image, and the processing speed is relatively slow; 2. The cost of use is high, because the decoding algorithm is relatively Complex, so it is necessary to use a high-end processor (such as a 32-bit processor) to implement the above algorithm, which requires the cooperation of a processor and a hardware acceleration circuit, which will result in high system costs; 3. The system is complex, difficult to integrate, and high in power consumption. Not easy for portable applications

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