threshUnimod
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[, integer Invert =0 ] )
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Input
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An integer between 0 and 116 specifying the input image frame number. A value of 0 represents the DMA memory buffer of the video device. Values in the range of 100-116 correspond to hidden frames.
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Output
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An integer between 1 and 116 specifying the output image frame number. Values in the range of 100-116 correspond to hidden frames.
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Channel
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An enumerated integer specifying the color channel that will be used for histogram analysis and thresholding. Must be one of the following values:
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TH_LUMINANCE=0 separate the objects of interest based on the intensity distribution.
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TH_HUE=1 separate the objects of interest based on the color pigment distribution.
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TH_SATURATION=2 - separate the objects of interest based on the color saturation distribution.
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This parameter is disregarded for grayscale images.
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Invert
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An optional boolean integer that defines if the foreground range should be inverted. Must be one of the following values:
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FALSE=0 normal mode of thresholding. The pixels whose values fall within the range between the calculated threshold levels will be treated as foreground ones, while the pixels with values outside the range will be treated as background ones.
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TRUE=1 inverted mode of thresholding. The pixels whose values fall within the range between the calculated threshold levels will be treated as background ones, while the pixels with values outside the range will be treated as foreground ones.
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Default value: FALSE
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A threshold level calculated from the histogram analysis and used for thresholding.
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ERR_OK
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The flag set if successful.
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ERR_FAILED
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The flag set if failed.
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This set of statements continuously captures an image and binarizes it using the unimodal thresholding:
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do
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grabim(110)
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threshUnimod(110,1,TH_LUMINANCE,TRUE)
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loop
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The outcome of this function is affected by the Histogram Preferences. Use setHistAttr to set the desired Sampling of the histogram and specify if the black or white pixels should be ignored in the histogram analysis.
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