The problem of the accuracy of some prints in the field of packaging printing technology due to the inability to accurately detect the thickness of the ink layer is studied. For this purpose, a method of detecting the ink layer thickness by combining the laser triangulation technique and the image processing technique is proposed. Firstly, the platform of the ink layer thickness detection system is built. Then the industrial camera acquires images and processes the acquired images. Finally obtains the laser offset using the improved probabilistic Hough transform method to calculate the thickness value. The experiments verified that the method can effectively measure the ink layer thickness of plastic flexible packaging prints.
The current method of detecting ink layer thickness still has the disadvantages of slow speed, will produce wear and tear on the detection object, low accuracy, etc. For this reason, this paper proposes an optimized Hough algorithm detection method for the existing ink layer thickness detection method. Firstly, based on the triangular laser principle, the measurement image is captured by CMOS camera; secondly, the probabilistic Hough linear transformation algorithm based on vertical straight line is optimized; finally, the system calibration and accuracy measurement are completed. The maximum detection thickness of the algorithm optimization reaches 20 µm, and the detection accuracy is better than 3 µm, which verifies the feasibility of the algorithm optimization
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