threshMin
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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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Filter
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An enumerated integer specifying the type of a filter used for smoothing the histogram prior to the distribution analysis. Must be one of the following values:
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TH_OPEN=0 apply the morphological opening to the histogram array.
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TH_MEDIAN=1 apply the median filter to the histogram array.
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Width
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A positive integer between 1 and 32 specifying the width of the filter window used for smoothing the histogram.
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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 are equal or above the calculated threshold level will be treated as foreground ones, while the pixels with values below the will be treated as background ones.
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TRUE=1 inverted mode of thresholding. The pixels whose values are equal or above the calculated threshold level will be treated as background ones, while the pixels with values below the 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 performs the thresholding of a sample image on the saturation channel using the minimum search function:
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SetCurDir("samples")
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loadIm (1,"sample12.iwd")
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threshMin (1, 2, TH_SATURATION, TH_OPEN, 3, TRUE)
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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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