Computes the size of the lower pyramid layer.
Syntax
IppStatus ippiGetPyramidDownROI(IppiSize srcRoi, IppiSize* pDstRoi, Ipp32f rate);
Platform-aware functions
IppStatus ippiGetPyramidDownROI_L(IppiSizeL srcRoi, IppiSizeL *pDstRoi, Ipp32f rate);
Include Files
ippcv.h
Flavors with the _L suffix: ippcv_l.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h, ippi.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib
Parameters
- srcRoiSize
- Size of the source pyramid layer ROI in pixels.
- pDstRoiSize
- Pointer to the size of the destination (lower) pyramid layer ROI in pixels.
- rate
- Ratio between source and destination layers (1 < rate≤ 10).
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
This function computes the size of the lower pyramid layer pDstRoiSize for a source layer of a given size srcRoiSize and specified size ratio rate between them in accordance with the following formulas: 
Note
Since for the non-integer rate results depend on the computational precision, it is strongly recommended to use this function in computations.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error if pDstRoiSize pointer is NULL. |
ippStsSizeErr |
Indicates an error condition if srcRoiSize has a field with zero or negative value. |
ippStsBadArgErr |
Indicates an error condition if rate is out of the range. |