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CvInvokePyrDown Method
http://www.emgu.com
Performs downsampling step of Gaussian pyramid decomposition. First it convolves source image with the specified filter and then downsamples the image by rejecting even rows and columns.

Namespace: Emgu.CV
Assembly: Emgu.CV.World (in Emgu.CV.World.dll) Version: 3.2.0.2682 (3.2.0.2682)
Syntax
public static void PyrDown(
	IInputArray src,
	IOutputArray dst,
	BorderType borderType = BorderType.Reflect101
)

Parameters

src
Type: Emgu.CVIInputArray
The source image.
dst
Type: Emgu.CVIOutputArray
The destination image, should have 2x smaller width and height than the source.
borderType (Optional)
Type: Emgu.CV.CvEnumBorderType
Border type
See Also