A distortion-correction method for workshop machine vision measurement system

Ruwen Chen; Ren Huang; Zhisheng Zhang; Jinfei Shi; Zixin Chen

doi:10.1117/12.819715

31 December 2008 A distortion-correction method for workshop machine vision measurement system

Ruwen Chen, Ren Huang, Zhisheng Zhang, Jinfei Shi, Zixin Chen

Proceedings Volume 7130, Fourth International Symposium on Precision Mechanical Measurements; 71304B (2008) https://doi.org/10.1117/12.819715
Event: Fourth International Symposium on Precision Mechanical Measurements, 2008, Anhui, China

Abstract

The application of machine vision measurement system is developing rapidly in industry for its non-contact, high speed, and automation characteristics. However, there are nonlinear distortions in the images which are vital to measuring precision, for the object dimensions are determined by the image properties. People are interested in this problem and put forward some physical model based correction methods which are widely applied in engineering. However, these methods are difficult to be realized in workshop for the images are non-repetitive interfered by the coupled dynamic factors, which means the real imaging is a stochastic process. A new nonlinear distortion correction method based on a VNAR model (Volterra series based nonlinear auto-regressive time series model) is proposed to describe the distorted image edge series. The model parameter vectors are achieved by the laws of data. The distortion-free edges are obtained after model filtering and the image dimensions are transformed to measuring dimensions. Experimental results show that the method is reliable and can be applied to engineering.

Citation Download Citation

Ruwen Chen, Ren Huang, Zhisheng Zhang, Jinfei Shi, and Zixin Chen "A distortion-correction method for workshop machine vision measurement system", Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71304B (31 December 2008); https://doi.org/10.1117/12.819715

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