Abstract
To measure the bracelet automatically, a novel method based on feature energy is proposed. Firstly, the morphological method is utilized to preprocess the image, and the contour consisting of a concentric circle is extracted. Then, a feature energy function, which is relevant to the distances from one pixel to the edge points, is defined taking into account the geometric properties of the concentric circle. The input image is subsequently transformed to the feature energy distribution map (FEDM) by computing the feature energy of each pixel. The center of the concentric circle is thus located by detecting the maximum on the FEDM; meanwhile, the radii of the concentric circle are determined according to the feature energy function of the center pixel. Finally, with the use of a calibration template, the internal diameter and thickness of the bracelet are measured. The experimental results show that the proposed method can measure the true sizes of the bracelet accurately with the simplicity, directness and robustness compared to the existing methods.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (61572173, 61472119 and 61472373), the program for Science and Technology Innovation Talents in Universities of Henan Province (13HASTIT039), Henan Polytechnic University Innovative Research Team (T2014-3) and Henan Polytechnic University Fund for Distinguished Young Scholars (J2016-3).
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Liu, H., Li, L., Wang, Z. et al. A Method to Measure the Bracelet Based on Feature Energy. Sens Imaging 18, 14 (2017). https://doi.org/10.1007/s11220-017-0163-x
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DOI: https://doi.org/10.1007/s11220-017-0163-x