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CStats:MinMaxClipMean
The MinMaxClipMean method computes the mean value inside a rectangular region of the image, excluding the minimum and maximum pixel values from the result. The rectangle and image must have been previously initialized for the CStats object.
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nMean = CStats:MinMaxClipMean() |
On success,
returns the min/max clipped mean value as a number.
On failure,
returns 0.
The calculated statistic excludes the lowest (minimum value) and highest (maximum value) pixels inside the region. Use this method to avoid a biased result when the region is suspected to contain one deviant high value and one deviant low value.
Suppose a CImageI and a CRectR exist. The following script fragment returns the mean value inside a rectangle on the image, discarding the 1 highest pixel value:
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S = CStats:new() |
-- create a CStats object |
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S:Init( I, R ) |
-- specify CImage and CRect to measure |
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nVal = S:MinMaxClipMean() |
-- returns the mean value |
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Printf("mean=%lg\n", nVal) |
-- list the results |
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S:delete() |
-- when done with S, remove it from memory |