CImCombine:MmClipRange

The MmClipRange method creates an image who's pixel values are the range of values among all images at each point, after excluding the 1 highest and 1 lowest value at each point.

Syntax

CImage = CImCombine:MmClipRange( CImageSet )

bullet.gif    CImageSet contains the collection of images to be combined.

bullet.gif    CImage is a new image created by this method.

bullet.gif    On success, this method returns a new CImage.

bullet.gif    On failure, this method returns nil.

Remarks

Each pixel in the output image is the range of values at the same location in all the images of the CImageSet. This is not an image like each of the source images, but is a statistical map over the surface of the collection of images. This method makes a smoother result than the Range method by excluding the most extreme high and low pixels from the result. Depending upon the images and the application, you may or may not wish to normalize the images before computing the range.

Example

Suppose a CImageSet named S exists. The following script combines the images by the MmClipRange method after normalizing their luminance by the median statistic computed inside the central 10% of the image:

C = new_imcombine()

-- create a CImCombine object

R = new_rect(10,50,10,50)

-- central 10% of the image

C:SetRelRect( R )

-- specify CImage and CRect to measure

C:SetNormStat("median")

-- use the median as the normalization statistic

C:SetNormMethod("scale")

-- scale to normalize the image set

I = C:MmClipRange( S )

-- combine the image set and return a new image

I:Display()

-- show the new image

C:delete()

-- when done with S, remove it from memory

Related Topics

CImCombine class, CImageSet class, CImage class, CRect class


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