Bar code positioning device and method and bar code reading device and method

Abstract

The invention relates to a bar code positioning device and method and a bar code reading device and method. The bar code reading device comprises a preprocessing unit, a scan area setting unit, a scanning obtaining unit, a feature point generating unit, a feature point set image generating unit, a feature point area determining unit, a bar code area determining unit and a bar code reading unit; the preprocessing unit obtains a binary image; the scan area setting unit sets an asterisk-shaped scan grid of a predetermined size as a scan area; the scanning obtaining unit rotates the scan area every certain angle within a prescribed angle range, obtains a corresponding area of the scan area in the binary image, and obtains a bar code image feature of the corresponding area; the feature point generating unit generates feature points; the feature point set image generating unit generates a corresponding feature point set image; the feature point area determining unit determines a feature point area; the bar code area determining unit determines a bar code area; and the bar code reading unit rotates a bar code image to the horizontal position according to the rotation angle of the scan area corresponding to the bar code area, and reads the bar code.

Description

Technical field [0001] The invention relates to a barcode positioning device, a barcode positioning method, a barcode reading device and a barcode reading method. Background technique [0002] At present, barcodes are widely used in various fields of life, such as: patent notification documents, express delivery slips, etc. The barcode is used to record information such as the serial number of the patent notification file and the logistics information in the express delivery slip. [0003] When processing a document page containing a barcode, it is necessary to manually locate the barcode area to be scanned, and then use a barcode scanner to align the barcode for scanning recognition. However, when the document page contains multiple barcodes, problems such as scanning errors and scanning omissions are prone to occur. [0004] In response to this problem, there has been a technical solution in the prior art that uses the sample pages to locate the barcode area in the same series of ...

AI Technical Summary

Problems solved by technology

Each has its own advantages and disadvantages. Wavelet texture analysis and neural network analysis require a large amount of calculation, and the real-time performance is not good. The gradient feature detection method can easily identify strong edge areas such as tables as barcodes.

[0006] In order to solve the problem that the barcode may be skewed when the barcode is pasted or printed by hand, or the distance between multiple barcodes is relatively close, or there are parallel lines or numbers around the barcode, which leads to the low accuracy of positioning the barcode, the inventor of the present invention proposes The scheme of positioning barcode that can solve the above-mentioned problems

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