The OpenVX Specification  r28647
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:

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

on each level of the pyramid then scales the image to the next level using VX_INTERPOLATION_TYPE_NEAREST_NEIGHBOR. Level 0 shall always have the same resolution as the input image. For the Gaussian pyramid, level 0 shall be the same as the input image. The pyramids must be configured with one of the following level scaling:

• VX_SCALE_PYRAMID_HALF
• VX_SCALE_PYRAMID_ORB

## Functions

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

vx_status vxuGaussianPyramid (vx_context context, vx_image input, vx_pyramid gaussian)
[Immediate] Computes a Gaussian pyramid from an input image. More...

## Function Documentation

 vx_node 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. [in] input The input image in VX_DF_IMAGE_U8 format. [out] gaussian The Gaussian pyramid with VX_DF_IMAGE_U8 to construct.
See also
Object: Pyramid
Returns
vx_node.
Return values
 0 Node could not be created. * Node handle.
 vx_status vxuGaussianPyramid ( vx_context context, vx_image input, vx_pyramid gaussian )

[Immediate] Computes a Gaussian pyramid from an input image.

Parameters
 [in] context The reference to the overall context. [in] input The input image in VX_DF_IMAGE_U8 [out] gaussian The Gaussian pyramid with VX_DF_IMAGE_U8 to construct.
Returns
A vx_status_e enumeration.
Return values
 VX_SUCCESS Success * An error occurred. See vx_status_e.