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Creates a region containing image pixels with values within the specified range.
Namespace: | AvlNet |
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Assembly: | AVL.NET.dll |
Syntax
public static void ThresholdToRegion ( AvlNet.Image inImage, NullableRef<AvlNet.Region> inRoi, float? inMinValue, float? inMaxValue, float inHysteresis, AvlNet.Region outRegion )
Parameters
Name | Type | Range | Default | Description | |
---|---|---|---|---|---|
inImage | AvlNet.Image | Input image. | |||
inRoi | AvlNet.NullableRef<AvlNet.Region> | Region of interest. Default value: atl::NIL. | |||
inMinValue | float? | 128.0f | Minimum value of a pixel that is considered foreground (Auto = -INF). Default value: 128.0f. | ||
inMaxValue | float? | Maximum value of a pixel that is considered foreground (Auto = +INF). Default value: atl::NIL. | |||
inHysteresis | float | <0.0f, INF> | 0.0f | Defines how much the threshold criteria are lowered for pixels neighboring with other foreground pixels. Default value: 0.0f. | |
outRegion | AvlNet.Region | Output region. |
Description
The operation is a cousin of ThresholdImage yet computes a region instead of an image. The resulting region contains those pixels of the input image that meet one of the following conditions:
- Pixel value is in range [inMinValue, inMaxValue].
- Pixel value is in range [inMinValue-inHysteresis, inMinValue) or in range (inMaxValue, inMaxValue+inHysteresis] and in the processed image there is a path of consecutive pixels of value in range [inMinValue-inHysteresis, inMaxValue+inHysteresis] that connects the pixel being considered and any pixel with value in range [inMinValue, inMaxValue].
If any of the parameters inMinValue, inMaxValue is not set, it is assumed to be, accordingly, -infinity or infinity.
In the multichannel images the operation uses an average of channel values in each pixel.
Examples
Hardware Acceleration
This operation is optimized for SSE2 technology for pixels of types: 1xUINT8, 3xUINT8, 1xINT16, 1xUINT16.
This operation is optimized for NEON technology for pixels of types: 1xUINT8, 3xUINT8, 1xINT16.
This operation supports automatic parallelization for multicore and multiprocessor systems.
Hardware acceleration settings may be manipulated with Settings class.
Errors
List of possible exceptions:
Error type | Description |
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DomainError | Region exceeds an input image in ThresholdToRegion. |