Two-dimension code preprocessing method and device

Abstract

The invention discloses a two-dimension code preprocessing method which comprises the following steps of luminance equalization: performing self-adaptation brightness equalization processing on the captured images to remove a too faint part and a too bright part in each image; binarization processing: performing binarization processing on the images subjected to the self-adaptation brightness equalization processing through an Otsu's method. The invention further discloses a two-dimension code preprocessing device which comprises a luminance equalization processing module for performing self-adaptation brightness equalization processing on the captured images to remove the too faint part and the too bright part in each image and a binarization processing module for performing binarization processing on the images subjected to the self-adaptation brightness equalization processing through the Otsu's method. By means of the two-dimension code preprocessing method and device, effect caused by uneven illumination in the bar code images is eliminated effectively, binarization can be performed on the bar code images with uneven illumination correctively, and the recognition rate of two-dimension codes is increased.

Description

technical field [0001] The invention relates to the technical field of two-dimensional codes, in particular to a method and device for preprocessing two-dimensional codes. Background technique [0002] A two-dimensional bar code (2-dimensional bar code) is a black and white graphic that distributes specific geometric figures on a plane according to certain rules. It is a kind of data symbol information. Two-dimensional codes have many significant advantages, such as high coding density, large information capacity, wide coding range, strong error correction ability, easy production, and low production cost. Due to the above reasons, two-dimensional codes have been widely used in many fields of life, such as logistics, medical and health, transportation, production and so on. [0003] Image readers usually include barcodes and other irrelevant background information when capturing two-dimensional barcodes, making the information in the photo very complicated. Moreover, due t...

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Problems solved by technology

[0006] In view of the deficiencies in the prior art and the inability to perform accurate binarization processing on barcode images in the binarization processing, the embodiment of the present invention provides a two-dimensional code preprocessing method and its device, providing a An adaptive brightness equalization algorithm, which effectively eliminates the influence of uneven illumination in the barcode image

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