Bar code image angle correction method and device

Abstract

The invention discloses a bar code image angle correction method and device, and the method comprises the steps: carrying out the graying and binarization of an obtained to-be-corrected bar code image, and obtaining a first binary image; performing contour retrieval on the white foreground region in the first binary image based on a contour retrieval algorithm to obtain a first contour; carrying out black filling on the white foreground region with the area smaller than a preset threshold value, and then carrying out contour retrieval again to obtain a second contour; calculating a center of asecond contour of the white foreground region based on the second contour; performing linear fitting on the obtained central point based on Hough transform, and outputting an included angle; calculating a correction angle based on the included angle; according to the bar code correction method, the bar code image to be corrected is rotated to obtain the corrected bar code image, and the technicalproblems that an existing bar code correction method can only perform small-angle correction on the one-dimensional bar code, the correction effect is poor under the condition that the angle inclination of the bar code is serious, and the bar code recognition result is poor are solved.

Description

Technical field [0001] This application relates to the field of image processing technology, and in particular to a method and device for correcting barcode image angles. Background technique [0002] Bar code is a symbol formed by arranging black lines and blanks of different thicknesses according to certain coding rules. Barcodes are widely used in daily life, such as commodities and express orders. The current one-dimensional barcodes can usually be used to store numbers, letters and other information. Since one-dimensional barcodes only express information in a single direction, the existing machine vision technology has requirements for the placement angle of the barcode when identifying one-dimensional barcodes. The angle of the barcode needs to be adjusted to facilitate barcode recognition. The existing barcode correction method can only perform small-angle correction for one-dimensional barcodes. When the barcode angle is severely tilted, the correction effect is poor, r...

AI Technical Summary

Problems solved by technology

[0003] This application provides a barcode image angle correction method and device, which are used to solve the problem that the existing barcode correction method can only perform small angle correction on one-dimensional barcodes, and the correction effect is poor when the barcode angle is seriously inclined, so that Technical issues with poor barcode recognition results

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