Computes the size of the lower pyramid layer.
Syntax
IppStatus ippiGetPyramidDownROI(IppiSize srcRoiSize, IppiSize* pDstRoiSize, Ipp32f rate);
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
The function ippiGetPyramidDownROI is declared in the ippcv.h file. It 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. |