Label inspection of approximate cylinder based on adverse cylinder panorama

Jianping Lin; Qingmin Liao; Bei He; Chenbo Shi

doi:10.1117/12.2042075

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19 December 2013 Label inspection of approximate cylinder based on adverse cylinder panorama

Jianping Lin, Qingmin Liao, Bei He, Chenbo Shi

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Proceedings Volume 9045, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology; 90451Y (2013) https://doi.org/10.1117/12.2042075
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

This paper presents a machine vision system for automated label inspection, with the goal to reduce labor cost and ensure consistent product quality. Firstly, the images captured from each single-camera are distorted, since the inspection object is approximate cylindrical. Therefore, this paper proposes an algorithm based on adverse cylinder projection, where label images are rectified by distortion compensation. Secondly, to overcome the limited field of viewing for each single-camera, our method novelly combines images of all single-cameras and build a panorama for label inspection. Thirdly, considering the shake of production lines and error of electronic signal, we design the real-time image registration to calculate offsets between the template and inspected images. Experimental results demonstrate that our system is accurate, real-time and can be applied for numerous real- time inspections of approximate cylinders.

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Jianping Lin, Qingmin Liao, Bei He, and Chenbo Shi "Label inspection of approximate cylinder based on adverse cylinder panorama", Proc. SPIE 9045, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology, 90451Y (19 December 2013); https://doi.org/10.1117/12.2042075

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