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_NEAREST_NEIGHBOR. For the Gaussian pyramid, level 0 shall always have the same resolution and contents as the input image. Pyramids configured with one of the following level scaling must be supported:

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

Function Documentation

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.
[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

vx_node

A node reference. Any possible errors preventing a successful creation should be checked using vxGetStatus

vx_status VX_API_CALL 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.