Mean_StdDev
Computes the mean and standard deviation of image pixel
values.
Syntax
Case 1: Operation on one-channel data
IppStatus
ippiMean_StdDev_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, IppiSize
roiSize
, Ipp64f*
pMean
, Ipp64f*
pStdDev
);
Supported values for
mod
:8u_C1R | 16u_C1R | 32f_C1R |
Case 2: Masked operation on one-channel data
IppStatus
ippiMean_StdDev_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, const Ipp8u*
pMask
, int
maskStep
, IppiSize
roiSize
, Ipp64f*
pMean
, Ipp64f*
pStdDev
);
Supported values for
mod
:8u_C1MR | 16u_C1MR | 32f_C1MR |
Case 3: Operation on multi-channel data
IppStatus
ippiMean_StdDev_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, IppiSize
roiSize
, int
coi
, Ipp64f*
pMean
, Ipp64f*
pStdDev
);
Supported values for
mod
:8u_C3CR | 16u_C3CR | 32f_C3CR |
Case 4: Masked operation on multi-channel data
IppStatus
ippiMean_StdDev_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, const Ipp8u*
pMask
, int
maskStep
, IppiSize
roiSize
, int
coi
, Ipp64f*
pMean
, Ipp64f*
pStdDev
);
Supported values for
mod
:8u_C3CMR | 16u_C3CMR | 32f_C3CMR |
Include Files
ippcv.h
Domain Dependencies
Headers:
ippcore.h
, ippvm.h
, ipps.h
, ippi.h
Libraries:
ippcore.lib
, ippvm.lib
, ipps.lib
, ippi.lib
Parameters
- pSrc
- Pointer to the source image ROI.
- srcStep
- Distance in bytes between starts of consecutive lines in the source image.
- pMask
- Pointer to the mask image.
- maskStep
- Distance in bytes between starts of consecutive lines in the mask image.
- roiSize
- Size of the source ROI in pixels
- coi
- Channel of interest (for color images only); can be 1, 2, or 3.
- pMean
- Pointer to the computed mean of pixel values.
- pStdDev
- Pointer to the computed standard deviation of pixel values in the image.
Description
This function operates with ROI (see Regions of Interest in Intel
IPP). This function computes the mean and standard deviation of pixel values
in the ROI of the source image
pSrc
. In the mask mode, the computation is done over pixels selected
by nonzero mask values. In the multi-channel mode, the mean is computed for a single
channel of interest specified by coi
. If any of the parameters pMean
or pStdDev
is not required, the
zero pointer is to be passed to the corresponding parameter. Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error or a warning.
- ippStsNullPtrErr
- Indicates an error whenpSrcorpMaskpointer isNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSizehas a field with zero or negative value.
- ippStsStepErr
- Indicates an error condition ifsrcStepormaskStepis less thanroiSize.width * <pixelSize>.
- ippStsNotEvenStepErr
- Indicates an error condition if steps for floating-point images cannot be divided by 4.
- ippStsCOIErr
- Indicates an error whencoiis not 1, 2, or 3.