The OpenVX Specification  a73e458
Gaussian Image Pyramid

## Detailed Description

Computes a Gaussian Image Pyramid from an input image.

This vision function creates the Gaussian image pyramid from the input image using the particular 5x5 Gaussian Kernel [R00068]:

$\mathbf{G}=\frac{1}{256} * \begin{vmatrix} 1 & 4 & 6 & 4 & 1 \\ 4 & 16 & 24 & 16 & 4 \\ 6 & 24 & 36 & 24 & 6 \\ 4 & 16 & 24 & 16 & 4 \\ 1 & 4 & 6 & 4 & 1 \\ \end{vmatrix}$

on each level of the pyramid then scales the image to the next level using VX_INTERPOLATION_NEAREST_NEIGHBOR [R00069]. For the Gaussian pyramid, level 0 shall always have the same resolution and contents as the input image [R00070]. Pyramids configured with one of the following level scaling must be supported [R00071]:

• VX_SCALE_PYRAMID_HALF
• VX_SCALE_PYRAMID_ORB

## Functions

vx_node VX_API_CALL vxGaussianPyramidNode (vx_graph graph, vx_image input, vx_pyramid gaussian)
[Graph] Creates a node for a Gaussian Image Pyramid. More...

## ◆ vxGaussianPyramidNode()

 vx_node VX_API_CALL vxGaussianPyramidNode ( vx_graph graph, vx_image input, vx_pyramid gaussian )

[Graph] Creates a node for a Gaussian Image Pyramid.

Parameters
 [in] graph The reference to the graph [R00252]. [in] input The input image in VX_DF_IMAGE_U8 format [R00253]. [out] gaussian The Gaussian pyramid with VX_DF_IMAGE_U8 to construct [R00254].
vx_node [R00255].
 vx_node A node reference. Any possible errors preventing a successful creation should be checked using vxGetStatus