earticle

영어

A rotation angle estimation method tailored for low-spec systems, such as embedded systems, was proposed, which is essential for image alignment in the initial stages of image analysis and recognition. While estimating the rotation angle using the phase of complex moments defined in polar coordinates can achieve high accuracy, it typically demands significant memory and longer processing times. Therefore, the proposed method narrows the search range for angle estimation using Angular-Radial Transform (ART) coefficients and simplifies the computation by converting rotation angle estimation using only the lowest frequency coefficient into a vector sum of projection profiles in polar coordinates. The memory usage, execution time, and estimation error of the proposed methods were also controlled to provide recommendations for selecting the most suitable method based on the performance and requirements of the target system.