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OpenSolaris 2009.06 - man page for mlib_imagestddev_fp (opensolaris section 3mlib)

mlib_ImageStdDev_Fp(3MLIB)				    mediaLib Library Functions					mlib_ImageStdDev_Fp(3MLIB)

mlib_ImageStdDev_Fp - image standard deviation
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_ImageStdDev_Fp(mlib_d64 *sdev, const mlib_image *img, const mlib_d64 *mean);
The mlib_ImageStdDev_Fp() function computes the standard deviation for each channel in the floating-point source image. It uses the following equation: 1 w-1 h-1 sdev[i] = { ----- * SUM SUM (img[x][y][i] - mean[i])**2 }**0.5 w*h x=0 y=0 where, in the case of mean == NULL, 1 w-1 h-1 mean[i] = ----- * SUM SUM img[x][y][i] w*h x=0 y=0
The function takes the following arguments: sdev Pointer to standard deviation array, whose size is the number of channels in the source image. sdev[i] contains the standard devia- tion of channel i. img Pointer to input image. mean Pointer to pre-computed mean array for each channel. (If NULL, it will be computed.) mean[i] contains the mean of channel i.
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
mlib_ImageMean(3MLIB), mlib_ImageMean_Fp(3MLIB), mlib_ImageStdDev(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_ImageStdDev_Fp(3MLIB)

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