Emgu CV Library Documentation
PyrUp Method
NamespacesEmgu.CVIImagePyrUp()()()

www.emgu.com/wiki
The function cvPyrUp performs up-sampling step of Gaussian pyramid decomposition. First it upsamples this image by injecting even zero rows and columns and then convolves result with the specified filter multiplied by 4 for interpolation. So the resulting image is four times larger than the source image.
Declaration Syntax
C#Visual BasicVisual C++
IImage PyrUp()
Function PyrUp As IImage
IImage^ PyrUp()
Return Value
The upsampled image

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)