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ThresholdImage_RGB

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Module: FoundationLite

Transforms each pixel value to minimum or maximum depending on whether it belongs to the specified range for each individual pixel component.

Applications

Multi-channel thresholding.
Name Type Range Description
Input value inRgbImage Image Input image, usually in the RGB color space
Input value inRoi Region* Region of interest
Input value inMinRed Integer* 0 - 255 Minimum for the first pixel component, usually Red (Auto = -INF)
Input value inMaxRed Integer* 0 - 255 Maximum for the first pixel component, usually Red (Auto = +INF)
Input value inMinGreen Integer* 0 - 255 Minimum for the second pixel component, usually Green (Auto = -INF)
Input value inMaxGreen Integer* 0 - 255 Maximum for the second pixel component, usually Green (Auto = +INF)
Input value inMinBlue Integer* 0 - 255 Minimum for the third pixel component, usually Blue (Auto = -INF)
Input value inMaxBlue Integer* 0 - 255 Maximum for the third pixel component, usually Blue (Auto = +INF)
Input value inMinAlpha Integer* 0 - 255 Minimum for the fourth pixel component, usually Blue (Auto = -INF)
Input value inMaxAlpha Integer* 0 - 255 Maximum for the fourth pixel component, usually Blue (Auto = +INF)
Input value inFuzziness Real 0.0 - Tolerance for the ranges that results in intermediate output values
Output value outMonoImage Image

Requirements

For input inRgbImage only pixel formats are supported: 3⨯uint8, 4⨯uint8.

Read more about pixel formats in Image documentation.

Description

The operation transforms each pixel of three-channel inRgbImage to the maximum or minimum level thus creating binary image. The input image is considered to be encoded using RGB color representation.

  • Pixels meeting all of the following conditions are transformed to the maximum level:
    • Intensity of the "red" channel is in range (inMinRed, inMaxRed).
    • Intensity of the "green" channel is in range (inMinGreen, inMaxGreen).
    • Intensity of the "blue" channel is in range (inMinBlue, inMaxBlue).
  • Other pixels are transformed to the maximum level.

If any of the parameters inMinRed, inMinGreen, inMinBlue is not set, it is assumed to be -infinity. If any of the parameters inMaxRed, inMaxGreen, inMaxBlue is not set, it is assumed to be infinity.

Parameter inFuzziness (set to 0 by default) allows to perform fuzzy thresholding which linearly interpolates those pixel values that differ by at most inFuzziness from the border channel intensities; thus creating smooth transition between minimum and maximum values in the resulting image.

Examples

ThresholdImage_RGB performed on the sample image with inMinRed = 120.0, inMaxGreen = 100.0, inMaxBlue = 100.0, inFuzziness = 0.0.

ThresholdImage_RGB performed on the sample image with inMinRed = 120.0, inMaxGreen = 100.0, inMaxBlue = 100.0, inFuzziness = 10.0.

Hardware Acceleration

This operation is optimized for SSSE4 (for inFuzziness = 0) technology.

This operation is optimized for AVX2 (for inFuzziness = 0) technology.

This operation is optimized for NEON technology for pixels of types: 1xUINT8 (for inFuzziness = 0), 3xUINT8 (for inFuzziness = 0).

This operation supports automatic parallelization for multicore and multiprocessor systems.

Errors

This filter can throw an exception to report error. Read how to deal with errors in Error Handling.

List of possible exceptions:

Error type Description
DomainError Not a 3-channel and 8-bit image in ThresholdImage_RGB.
DomainError Region exceeds an input image in ThresholdImage_RGB.
DomainError Not supported inRgbImage pixel format in ThresholdImage_RGB. Supported formats: 3xUInt8, 4xUInt8.

Complexity Level

This filter is available on Advanced Complexity Level.

Filter Group

This filter is member of ThresholdImage filter group.

See Also

  • ThresholdToRegion_RGB – Creates a region containing image pixels which belongs to the specified range for each individual pixel component.