Detailed Description

Implements the Gradient Phase Computation Kernel. The output image dimensions should be the same as the dimensions of the input images.

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.

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

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

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...

vx_status VX_API_CALL	vxuPhase (vx_context context, vx_image grad_x, vx_image grad_y, vx_image orientation)
	[Immediate] Invokes an immediate Phase. More...

Function Documentation

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.
[in]	grad_x	The input x image. This must be in `VX_DF_IMAGE_S16` format.
[in]	grad_y	The input y image. This must be in `VX_DF_IMAGE_S16` format.
[out]	orientation	The phase image. This is in `VX_DF_IMAGE_U8` format, and must have the same dimensions as the input images.

Return values

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

vx_status VX_API_CALL vxuPhase	(	vx_context	context,
		vx_image	grad_x,
		vx_image	grad_y,
		vx_image	orientation
	)

[Immediate] Invokes an immediate Phase.

Parameters

[in]	context	The reference to the overall context.
[in]	grad_x	The input x image. This must be in `VX_DF_IMAGE_S16` format.
[in]	grad_y	The input y image. This must be in `VX_DF_IMAGE_S16` format.
[out]	orientation	The phase image. This will be in `VX_DF_IMAGE_U8` format.

Return values

VX_SUCCESS	Success
*	An error occurred. See `vx_status_e`.