Phase

Detailed Description

Implements the Gradient Phase Computation Kernel.

This kernel takes two gradients in VX_DF_IMAGE_S16 format and computes the angles for each pixel and stores this in a VX_DF_IMAGE_U8 image [R00095].

\[ \phi = \tan^{-1}{\frac{grad_y(x,y)}{grad_x(x,y)}} \]

Where \( \phi \) is then translated to \( 0 \le \phi < {2}\pi \). Each \( \phi \) value is then mapped to the range 0 to 255 inclusive [R00096].

Functions
vx_node VX_API_CALL	vxPhaseNode (vx_graph graph, vx_image grad_x, vx_image grad_y, vx_image orientation)
	[Graph] Creates a Phase node. More...

Function Documentation

vxPhaseNode()

vx_node VX_API_CALL vxPhaseNode	(	vx_graph	graph,
		vx_image	grad_x,
		vx_image	grad_y,
		vx_image	orientation
	)

[Graph] Creates a Phase node.

Parameters

[in]	graph	The reference to the graph [R00166].
[in]	grad_x	The input x image. This must be in VX_DF_IMAGE_S16 format [R00167].
[in]	grad_y	The input y image. This must be in VX_DF_IMAGE_S16 format [R00168].
[out]	orientation	The phase image. This is in VX_DF_IMAGE_U8 format [R00169].

See also

VX_KERNEL_PHASE

Returns

vx_node [R00170].

Return values

vx_node

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