Furthermore, a Radon domain is reproduced while raising resolution of a footprint image subjected to the Ridgelet transform stepwise and pattern matching is allowed by Hough transformation since the Radontransform is equal to a parameter space of the Hough transformation. 更に、Radon変換はHough変換のパラメータ空間と等しいため、Ridgelet変換された足跡画像を段階的に解像度を上げながらRadonドメインを再生し、Hough変換によってパターンマッチングが可能となる。 - 特許庁
In the Ridgelet transform, an edge on a straight line is effectively expressed, noise is effectively removed, magnification, reduction, parallel translation and rotation are easily performed in a transformation domain by nature of Radontransform for performing linear integration of a luminance value. Ridgelet変換は、輝度値を線積分するRadon変換の性質により、直線上のエッジを効果的に表現し、かつ雑音を効果的に除去でき、変換ドメイン内で拡大縮小、並行移動、回転を容易に行える。 - 特許庁