threshTrim
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[, integer Invert =0, floating& Lev1, floating& Lev2 ] )
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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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Left, Right
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Floating variables or constants specifying the percentage of pixels that will be ignored at the left-most and right-most histogram bins.
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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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Lev1, Lev2
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Optional floating variables that return the minimum and maximum levels calculated from the histogram analysis and used for thresholding. The number of variables submitted should correspond to the amount of phases specified by the Phases argument.
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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 grabs an image and binarizes it using the trimming of the histogram:
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do
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grabim(110)
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threshTrim(110,1,TH_LUMINANCE,5,0)
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loop
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