Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

CopySubpix

Copies pixel values between two images with subpixel precision.

Syntax

Case 1: Copying without conversion or with conversion to floating point data
IppStatus ippiCopySubpix_<mod>
(
const
Ipp<srcDatatype>*
pSrc
,
int
srcStep
,
Ipp<dstDatatype>*
pDst
,
int
dstStep
,
IppiSize
roiSize
,
Ipp32f
dx
,
Ipp32f
dy
);
Supported values for
mod
:
8u_C1R
16u_C1R
32f_C1R
8u32f_C1R
16u32f_C1R
 
Case 2: Copying with conversion to integer data
IppStatus ippiCopySubpix_8u16u_C1R_Sfs
(
const
Ipp8u*
pSrc
,
int
srcStep
,
Ipp16u*
pDst
,
int
dstStep
,
IppiSize
roiSize
,
Ipp32f
dx
,
Ipp32f
dy
,
int
scaleFactor
);
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.
pDst
Pointer to the destination image ROI.
dstStep
Distance in bytes between starts of consecutive lines in the destination image.
roiSize
Size of the source and destination ROI in pixels.
dx
Fractional part of the
x
-coordinate in the source image.
dy
Fractional part of the
y
-coordinate in the source image.
scaleFactor
Scale factor (see Integer Result Scaling ).
Description
This function operates with ROI (see Regions of Interest in Intel IPP ).
This function computes the pixel value of the destination image using linear interpolation (see Linear Interpolation in Appendix B) in accordance with the following formula:
where
i
= 0, ...
roiSize.height
- 1
,
j
= 0, ...
roiSize.width
- 1
.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr
Indicates an error when any of the specified pointers is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.
ippStsStepErr
Indicates an error condition if
srcStep
or
dstStep
is less than
roiSize.width
*
<pixelSize>
.
ippStsNotEvenStepErr
Indicates an error condition if one of
srcStep
or
dstStep
is not divisible by 4 for floating point images, or by 2 for short integer images.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804