Arithmetic Subtraction

Detailed Description

Performs subtraction between two images.

Arithmetic subtraction is performed between the pixel values in two VX_DF_IMAGE_U8 or two VX_DF_IMAGE_S16 images. The output image can be VX_DF_IMAGE_U8 only if both source images are VX_DF_IMAGE_U8 and the output image is explicitly set to VX_DF_IMAGE_U8. It is otherwise VX_DF_IMAGE_S16. If one of the input images is of type VX_DF_IMAGE_S16, all values are converted to VX_DF_IMAGE_S16. The overflow handling is controlled by an overflow-policy parameter. For each pixel value in the two input images:

\[ out(x,y) = in_1(x,y) - in_2(x,y) \]

Functions
vx_node	vxSubtractNode (vx_graph graph, vx_image in1, vx_image in2, vx_enum policy, vx_image out)
	[Graph] Creates an arithmetic subtraction node. More...
vx_status	vxuSubtract (vx_context context, vx_image in1, vx_image in2, vx_enum policy, vx_image out)
	[Immediate] Performs arithmetic subtraction on pixel values in the input images. More...

Function Documentation

vx_node vxSubtractNode	(	vx_graph	graph,
		vx_image	in1,
		vx_image	in2,
		vx_enum	policy,
		vx_image	out
	)

[Graph] Creates an arithmetic subtraction node.

Parameters

[in]	graph	The reference to the graph.
[in]	in1	An input image, VX_DF_IMAGE_U8 or VX_DF_IMAGE_S16, the minuend.
[in]	in2	An input image, VX_DF_IMAGE_U8 or VX_DF_IMAGE_S16, the subtrahend.
[in]	policy	A VX_TYPE_ENUM of the vx_convert_policy_e enumeration.
[out]	out	The output image, a VX_DF_IMAGE_U8 or VX_DF_IMAGE_S16 image.

Returns

vx_node.

Return values

0	Node could not be created.
*	Node handle.

vx_status vxuSubtract	(	vx_context	context,
		vx_image	in1,
		vx_image	in2,
		vx_enum	policy,
		vx_image	out
	)

[Immediate] Performs arithmetic subtraction on pixel values in the input images.

Parameters

[in]	context	The reference to the overall context.
[in]	in1	A VX_DF_IMAGE_U8 or VX_DF_IMAGE_S16 input image, the minuend.
[in]	in2	A VX_DF_IMAGE_U8 or VX_DF_IMAGE_S16 input image, the subtrahend.
[in]	policy	A vx_convert_policy_e enumeration.
[out]	out	The output image in VX_DF_IMAGE_U8 or VX_DF_IMAGE_S16 format.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Success
*	An error occurred. See vx_status_e.