Design of measuring system for wire diameter based on sub-pixel edge detection algorithm

Yudong Chen; Wang Zhou

doi:10.1117/12.2243166

27 September 2016 Design of measuring system for wire diameter based on sub-pixel edge detection algorithm

Yudong Chen, Wang Zhou

Proceedings Volume 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment; 96842T (2016) https://doi.org/10.1117/12.2243166
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Light projection method is often used in measuring system for wire diameter, which is relatively simpler structure and lower cost, and the measuring accuracy is limited by the pixel size of CCD. Using a CCD with small pixel size can improve the measuring accuracy, but will increase the cost and difficulty of making. In this paper, through the comparative analysis of a variety of sub-pixel edge detection algorithms, polynomial fitting method is applied for data processing in measuring system for wire diameter, to improve the measuring accuracy and enhance the ability of anti-noise. In the design of system structure, light projection method with orthogonal structure is used for the detection optical part, which can effectively reduce the error caused by line jitter in the measuring process. For the electrical part, ARM Cortex-M4 microprocessor is used as the core of the circuit module, which can not only drive double channel linear CCD but also complete the sampling, processing and storage of the CCD video signal. In addition, ARM microprocessor can complete the high speed operation of the whole measuring system for wire diameter in the case of no additional chip. The experimental results show that sub-pixel edge detection algorithm based on polynomial fitting can make up for the lack of single pixel size and improve the precision of measuring system for wire diameter significantly, without increasing hardware complexity of the entire system.

Citation Download Citation

Yudong Chen and Wang Zhou "Design of measuring system for wire diameter based on sub-pixel edge detection algorithm", Proc. SPIE 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment, 96842T (27 September 2016); https://doi.org/10.1117/12.2243166

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KEYWORDS

Charge-coupled devices

Edge detection

Detection and tracking algorithms

Light sources

Video

Light

Microcontrollers

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