Thresholding

Detailed Description

Thresholds an input image and produces an output Boolean image.

In VX_THRESHOLD_TYPE_BINARY, the output is determined by:

\[ dst(x,y) = \begin{cases} 255 & \text{if } src(x,y) > threshold \cr 0 & \text{otherwise } \end{cases} \]

In VX_THRESHOLD_TYPE_RANGE, the output is determined by:

\[ dst(x,y) = \begin{cases} 0 & \text{if } src(x,y) > upper \cr 0 & \text{if } src(x,y) < lower \cr 255 & \text{otherwise } \end{cases} \]

Functions
vx_node VX_API_CALL	vxThresholdNode (vx_graph graph, vx_image input, vx_threshold thresh, vx_image output)
	[Graph] Creates a Threshold node. More...
vx_status VX_API_CALL	vxuThreshold (vx_context context, vx_image input, vx_threshold thresh, vx_image output)
	[Immediate] Threshold's an input image and produces a VX_DF_IMAGE_U8 * boolean image. More...

Function Documentation

vx_node VX_API_CALL vxThresholdNode	(	vx_graph	graph,
		vx_image	input,
		vx_threshold	thresh,
		vx_image	output
	)

[Graph] Creates a Threshold node.

Parameters

[in]	graph	The reference to the graph.
[in]	input	The input image. VX_DF_IMAGE_U8 is supported.
[in]	thresh	The thresholding object that defines the parameters of the operation.
[out]	output	The output Boolean image. Values are either 0 or 255.

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 vxuThreshold	(	vx_context	context,
		vx_image	input,
		vx_threshold	thresh,
		vx_image	output
	)

[Immediate] Threshold's an input image and produces a VX_DF_IMAGE_U8 * boolean image.

Parameters

[in]	context	The reference to the overall context.
[in]	input	The input image. VX_DF_IMAGE_U8 is supported.
[in]	thresh	The thresholding object that defines the parameters of the operation.
[out]	output	The output Boolean image. Values are either 0 or 255.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Success
*	An error occurred. See vx_status_e.