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http://dx.doi.org/10.22156/CS4SMB.2021.11.10.020

Rotation Angle Estimation Method using Radial Projection Profile  

Choi, Minseok (Division of AI Informatics, Sahmyook University)
Publication Information
Journal of Convergence for Information Technology / v.11, no.10, 2021 , pp. 20-26 More about this Journal
Abstract
In this paper, we studied the rotation angle estimation methods required for image alignment in an image recognition environment. In particular, a rotation angle estimation method applicable to a low specification embedded-based environment was proposed and compared with the existing method using complex moment. The proposed method estimates the rotation angle through similarity mathcing of the 1D projection profile along the radial axis after converting an image into polar coordinates. In addition, it is also possible to select a method of using vector sum of the projection profile, which more simplifies the calculation. Through experiments conducted on binary pattern images and gray-scale images, it was shown that the estimation error of the proposed method is not significantly different from that of complex moment-based method and requires less computation and system resources. For future expansion, a study on how to match the rotation center in gray-scale images will be needed.
Keywords
Rotation angle; Angle estimation; Rotation invariant moment; Radial projection; Vector sum;
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