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FIL.ImagePolarTransform
Transforms an image to polar or log-polar space.
| Namespace: | FilNet |
|---|---|
| Assembly: | FIL.NET.dll |
Syntax
C++
C#
public static void ImagePolarTransform ( FilNet.Image inImage, FilNet.Point2D inCenter, FilNet.PolarSpaceType inOutputSpaceType, FilNet.PolarInterpolationMethod inInterpolation, FilNet.Image outImage )
Parameters
| Name | Type | Range | Default | Description | |
|---|---|---|---|---|---|
 | inImage | FilNet.Image | Input image. | ||
| inCenter | FilNet.Point2D | Center of the coordinate system in input image. | ||
| inOutputSpaceType | FilNet.PolarSpaceType | Method of transformation. | ||
| inInterpolation | FilNet.PolarInterpolationMethod | Method of underlying interpolation. | ||
 | outImage | FilNet.Image | Output image. |
Description
It uses the following transformation:
\[ dst(\rho, \phi) = src(x,y), \]where
\[ \rho = m \sqrt{x^2 + y^2} , \phi = \arctan(\frac{y}{x}), \]for linear-polar space, and
\[ \rho = k \log{\sqrt{x^2+y^2} }, \phi = \arctan(\frac{y}{x}), \]for log-polar space, which emulates the human "foveal vision".
Parameters \(m\) and \(k\) are chosen so that entire source image could fit into output image.
Transformation does not change image dimensions.
Examples
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ImagePolarTransform performed on the sample image with inCenter = (150,150), and inOutputSpaceType Polar and LogPolar respectively.
