Projective TransformationJ

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射影変換


射影変換は、遠近法を用いた図が必要なときに用います。射影変換は、点の以前の像と現在の像との4つの組で定義されます。 その定義は 相似変換と類似しています。(相似変換は4つ、射影変換は8つの点が必要ですが)

例として直角格子の射影の像を作る場面を考えてみましょう。 この場合、直角格子と、写った先の4つの頂点をただ描くだけです。 射影変換は直角格子の頂点から像の頂点への写像で定義されます。


射影変換の定義


この後、直角格子のすべての要素を選んで変換を適用します。その結果、直角格子の望んでいた射影変換の像になります。

直角格子の像





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Contributors to this page: Akira Iritani .
Page last modified on Saturday 14 of August, 2010 [22:25:59 UTC] by Akira Iritani.

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