Ampoule bottle printed word defect detection method based on image registration

Abstract

The invention discloses an ampoule bottle printed word defect detection method based on image registration, which comprises the following steps of: 1, acquiring an ampoule bottle printed word image by using a linear array industrial camera to obtain a template image and a to-be-registered image; 2, performing feature point extraction and feature point description on the template image by using an SURF algorithm, and performing feature point extraction and feature point description on the to-be-registered image; step 3, performing feature point matching by using an FLANN matching algorithm; 4, according to the matched feature point pairs, calculating a transformation matrix of the to-be-registered image mapped to the template image; 5, calibrating the to-be-registered image through the transformation matrix, and eliminating image distortion; and 6, carrying out image difference on the template image and the calibrated to-be-registered image to obtain a difference image, and judging whether the printed characters have defects or not according to the difference image. According to the method, the feature extraction, matching, correction and detection of the ampoule bottle printed character image can be quickly and effectively realized, and the detection process takes less time.

Description

technical field [0001] The invention belongs to the field of industrial printed word defect detection, in particular to an image registration-based method for detecting printed word defects in ampoule bottles. Background technique [0002] In recent years, more and more people have paid more and more attention to the quality and safety of medicines, and the state has also increased the quality inspection of medicines. For the field of ampoule bottle printing, the quality requirements for its printed characters are also stricter, so as to avoid medication safety problems caused by incomplete printing or incomplete information on ampoule bottles. [0003] At present, the printing equipment used by pharmaceutical bottle manufacturers does not have supporting printing testing equipment at the back end, so they can only hire manual workers to test the printing quality of ampoule bottles, and manual testing has unavoidable defects: [0004] 1. It is easy to cause missed inspectio...

AI Technical Summary

Problems solved by technology

For the field of ampoule bottle printing, the quality requirements for its printed characters are also stricter, so as to avoid medication safety problems caused by incomplete printing or incomplete information on ampoule bottles

[0003] At present, the printing equipment used by pharmaceutical bottle manufacturers does not have supporting printing testing equipment at the back end, so they can only hire manual workers to test the printing quality of ampoule bottles, and manual testing has unavoidable defects:

[0004] 1. It is easy to cause missed inspections. Due to long-term work, the eyes will be tired, and it is easy to miss some defect information and make wrong judgments on some defects.

[0005] 2. The qualified standards of quality cannot be completely unified, and different people may make different judgments on the product due to subjective consciousness when testing the same product

[0006] 3. Slow speed, high cost, low efficiency, requiring a lot of labor and capital

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