完成图像由直角坐标系到极坐标转换，并将极坐标系下的图像再转换为直角坐标下表示。-To complete the image by the Cartesian coordinates to polar coordinate conversion, and polar coordinates under the image and then converted to rectangular coordinates, said.

对数极坐标变换的基本内容，非常适合初学者看看，有图示，很好理解-The basic content of the log-polar coordinate transformation is very suitable for beginners to see the icon, a good understanding of

The Fourier Transform of a projection at angle θ is a line in the Fourier transform of the image at the same angle. If (l, θ) are sampled sufficiently dense, then from g (l, θ) we essentially know F(u,v) (on the polar coordinate), and by inverse tran