Imaging Components, Systems, and Processing

Short-time Fourier transform method for online glass ream inspection

[+] Author Affiliations
Anding Li, Youping Chen, Jingming Xie

Huazhong University of Science and Technology, Engineering Research Center of Numerical Control System, School of Mechanical Science and Engineering, Advanced Manufacturing Building, Room C413, Wuhan 430074, China

Opt. Eng. 55(8), 083109 (Aug 25, 2016). doi:10.1117/1.OE.55.8.083109
History: Received May 6, 2016; Accepted August 2, 2016
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Abstract.  In the float glass defect inspection system based on machine vision, the common defects can be detected and classified correctly. However, the online glass ream inspection is still a problem to be solved, and the accuracy cannot fulfill the requirement of glass grading. As the glass ream is a rather slight optical distortion in most cases, it should be amplified so that it can be checked out easily. A Moiré method based on the theory of superposition shadow is proposed, which can magnify the distortion effectively without increasing the system complexity, and a STFT method is presented to analyze the distortion according to the characteristics of Moiré fringe pattern. With this method, the vision interference angle of glass ribbon can be calculated out accurately in real time, which makes it suitable for online glass ream inspection.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Anding Li ; Youping Chen and Jingming Xie
"Short-time Fourier transform method for online glass ream inspection", Opt. Eng. 55(8), 083109 (Aug 25, 2016). ; http://dx.doi.org/10.1117/1.OE.55.8.083109


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