Magnitude

Detailed Description

Implements the Gradient Magnitude Computation Kernel.

This kernel takes two gradients in VX_DF_IMAGE_S16 format and computes the VX_DF_IMAGE_S16 normalized magnitude [R00078]. Magnitude is computed as [R00079]:

\[ mag(x,y) = \sqrt{grad_x(x,y)^2 + grad_y(x,y)^2} \]

The conceptual definition describing the overflow is given as [R00080]:

uint16 z = uint16( sqrt( double( uint32( int32(x) * int32(x) ) + uint32( int32(y) * int32(y) ) ) ) + 0.5);

int16 mag = z > 32767 ? 32767 : z;

Functions
vx_node VX_API_CALL	vxMagnitudeNode (vx_graph graph, vx_image grad_x, vx_image grad_y, vx_image mag)
	[Graph] Create a Magnitude node. More...

Function Documentation

vxMagnitudeNode()

vx_node VX_API_CALL vxMagnitudeNode	(	vx_graph	graph,
		vx_image	grad_x,
		vx_image	grad_y,
		vx_image	mag
	)

[Graph] Create a Magnitude node.

Parameters

[in]	graph	The reference to the graph [R00178].
[in]	grad_x	The input x image. This must be in VX_DF_IMAGE_S16 format [R00179].
[in]	grad_y	The input y image. This must be in VX_DF_IMAGE_S16 format [R00180].
[out]	mag	The magnitude image. This is in VX_DF_IMAGE_S16 format [R00181].

See also

VX_KERNEL_MAGNITUDE

Returns

vx_node [R00182].

Return values

vx_node

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