Measurement of 2D microdisplacement and calibration of distorted image data via annular bar code ruler

Xiao Zhang; Zhixing Wang; Zhengdong Wang; Xiangyen Li

doi:10.1117/12.471897

20 September 2002 Measurement of 2-D micro-displacement and calibration of distorted image data via annular bar code ruler

Xiao Zhang, Zhixing Wang, Zhengdong Wang, Xiangyen Li

Author Affiliations +

Proceedings Volume 4919, Advanced Materials and Devices for Sensing and Imaging; (2002) https://doi.org/10.1117/12.471897
Event: Photonics Asia, 2002, Shanghai, China

Abstract

A special man-made 2-D bar code ruler is applied to the CCD image measurement of 2-D micro-displacement of close quarters object in this paper. The bar code ruler is a set of concentric annulus in which the widths of them are based on cosine rule. In measuring process, the ruler is attached to the object, moving with it, and the relatively fixed CCD collects the image data of the bar code before and after the movement. From analysis of phase shifts of those image data, we can get the measuring results. Besides that the measurement precision is affected by quantization, the size of pixels and interspaces between pixels, there are other factors which can cause distorted image data and in turn result in errors in results. By comparison of the decussating form and the concentric annular form of the bar code, we can see that though not all the image data of the whole annulus make contribution to the calculation of phase shifts, the latter form plays a great role in practical application for it ensures the precondition which makes it possible to get correct measurement and detect the distorted image data.

Citation Download Citation

Xiao Zhang, Zhixing Wang, Zhengdong Wang, and Xiangyen Li "Measurement of 2-D micro-displacement and calibration of distorted image data via annular bar code ruler", Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002); https://doi.org/10.1117/12.471897

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