Start » Filter Reference » OpenCV » Geometric Image Transformations » cvGetRotationMatrix2D
Basic| Module: | OpenCV |
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Calculates the affine matrix of 2D rotation.
Applications
Prepares matrix to be used with cvWarpAffine.
| Name | Type | Description | |
|---|---|---|---|
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inCenter | Point2D | Center of the rotation in the source image. |
|
inAngle | Real | Rotation angle in degrees. Positive values mean counter-clockwise rotation. The coordinate origin is assumed to be the top-left corner. |
|
inScale | Real | Isotropic scale factor. |
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outM | Matrix | The output affine transformation, 2x3 floating-point matrix. |
Description
The operation calculates matrix of rotation described on input. Rotation matrix can be applied to image using cvWarpAffine filter.
Examples
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Result of applying output matrix of cvGetRotationMatrix2D with inCenter = (150, 150), inAngle = 45.0, inScale = 1 to sample image using cvWarpAffine. The cvWarpAffine filter was used with inDWidth = 300, inDHeight = 300 and inBorderMode = BORDER_CONSTANT.
Complexity Level
This filter is available on Basic Complexity Level.
See Also
- cvWarpAffine – Applies an affine transformation to an image.
- cvGetAffineTransform – Calculates the affine transform from 3 corresponding points.
- cvGetPerspectiveTransform – Calculates the perspective transform from four pairs of corresponding points.