CImCombine:Sdev

The Sdev method creates an image who's pixel values are the standard deviation of values at each point among all images. Each pixel in the output image is the standard deviation of values at the same location in all the images of the CImageSet. For the Sdev method to work properly, the images must be normalized; this can be done by the combining process..

Syntax

CImage = CImCombine:Sdev( 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.

Example

Suppose a CImageSet named S exists. The following script combines the images by the Sdev 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:Sdev( 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

SdevClip


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