Visible to Intel only — GUID: GUID-C0C9D760-C456-4208-814E-279146FAE176
Visible to Intel only — GUID: GUID-C0C9D760-C456-4208-814E-279146FAE176
ResizeAntialiasing
Changes an image size using the chosen interpolation method with antialiasing.
Syntax
IppStatus ippiResizeAntialiasing_<data_type>_<chan>(const Ipp<data_type>* pSrc, Ipp32s srcStep, Ipp<data_type>* pDst, Ipp32s dstStep, IppiPoint dstOffset, IppiSize dstSize, IppiBorderType border, const Ipp<data_type>* pBorderValue, const IppiResizeSpec_32f* pSpec, Ipp8u* pBuffer);
Supported values for data_type:
8u |
16u |
16s |
32f |
Supported values for chan:
C1R |
C3R |
C4R |
Also supported 64f_C1R mode:
IppStatus ippiResizeAntialiasing_64f_C1R(const Ipp64f* pSrc, Ipp32s srcStep, Ipp64f* pDst, Ipp32s dstStep, IppiPoint dstOffset, IppiSize dstSize, IppiBorderType border, const Ipp64f* pBorderValue, const IppiResizeSpec_64f* pSpec, Ipp8u* pBuffer);
Platform-aware functions
IppStatus ippiResizeAntialiasing_<data_type>_<chan>_L(const Ipp<data_type>* pSrc, IppSizeL srcStep, Ipp<data_type>* pDst, IppSizeL dstStep, IppiPointL dstOffset, IppiSizeL dstSize, IppiBorderType border, const Ipp<data_type>* pBorderValue, const IppiResizeSpec* pSpec, Ipp8u* pBuffer);
Supported values for data_type:
8u |
16u |
16s |
32f |
Supported values for chan:
C1R |
C3R |
C4R |
Threading layer (TL) functions
IppStatus ippiResizeAntialiasing_<data_type>_<chan>_LT(const Ipp<data_type>* pSrc, IppSizeL srcStep, Ipp<data_type>* pDst, IppSizeL dstStep, IppiBorderType border, const Ipp<data_type>* pBorderValue, const IppiResizeSpec_LT* pSpec, Ipp8u* pBuffer);
Supported values for data_type:
8u |
16u |
16s |
32f |
Supported values for chan:
C1R |
C3R |
C4R |
Include Files
ippi.h
Flavors with the _LT suffix: ippi_tl.h
Flavors with the _L suffix: ippi_l.h
Domain Dependencies
Flavors declared in ippi.h:
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Flavors declared in ippi_tl.h:
Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib, ippcore_tl.lib, ippi_tl.lib
Parameters
pSrc |
Pointer to the source image. | ||||||||||
srcStep |
Distance, in bytes, between the starting points of consecutive lines in the source image buffer. | ||||||||||
pDst |
Pointer to the destination image. | ||||||||||
dstStep |
Distance, in bytes, between the starting points of consecutive lines in the destination image buffer. | ||||||||||
dstOffset |
Offset of the tiled destination image with respect to the destination image origin. |
||||||||||
dstSize |
Size of the destination image, in pixels. | ||||||||||
border |
Type of border. Possible values are:
Mixed borders are also supported. They can be obtained by the bitwise operation OR between the ippBorderRepl type and the ippBorderInMemTop, ippBorderInMemBottom, ippBorderInMemLeft, ippBorderInMemRight types. |
||||||||||
pBorderValue |
Pointer to the constant value to assign to pixels of the constant border. This parameter is applicable only to the ippBorderConst border type. | ||||||||||
pSpec |
Pointer to the specification structure for the resize filter. | ||||||||||
pBuffer |
Pointer to the external buffer. |
Description
The ippiResizeAntialiasing function changes the size of an image using the chosen interpolation method with antialiasing. The interpolation method to be applied is defined by the function that you use for the resize filter initialization. Use this function to reduce the image size with minimization of moire artifacts. For more information about the implemented algorithm, refer to [SCHU92].
If you use ippiResizeAntialiasing to increase the image size, the function applies the same algorithm as one of the following resize functions, depending on the interpolation type chosen at the initialization stage: ippiResizeLinear, ippiResizeCubic, or ippiResizeLanczos.
This function operates with ROI. It resizes the source image ROI origin to the destination image ROI origin. Define the destination image ROI origin by the following parameters: the offset of the tiled destination image with respect to the destination image origin and the destination image size. The source image ROI origin is defined automatically. To obtain the source image ROI, use the corresponding flavor of the ippiResizeGetSrcRoi function. To obtain the source image ROI origin offset, call the corresponding flavor of the ippiResizeGetSrcOffset function. Parameters pSrc and pDst must point to the processed source and destination image ROI origins, respectively.
The interpolation algorithm applied uses edge pixels of the source image that are out of the image origin. The ippiResizeAntialiasing function uses the weighted values of these outer pixels. To obtain the size of the out of the source image origin, call the corresponding flavor of the ippiResizeGetBorderSize function.
Before using the ippiResizeAntialiasing function, you need to initialize the IppiResizeSpec_32f structure using one of the following functions, depending on the interpolation method to be applied: ippiResizeAntialiasingLinearInit, ippiResizeAntialiasingCubicInit, or ippiResizeAntialiasingLanczosInit, and compute the size of the external buffer pBuffer using the corresponding flavor of the ippiResizeGetBufferSize function. The same instructions work for ippiResizeAntialiasing_64f, but with 64f equivalent init functions.
For more information about the supported border types, see User-defined Border Types.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error when one of the specified pointers is NULL. |
ippStsNoOperation |
Indicates a warning when width or height of the destination image is equal to zero. |
ippStsBorderErr |
Indicates an error when the border value is illegal. |
ippStsContextMatchErr |
Indicates an error when a pointer to the specification structure is invalid. |
ippStsNotSupportedModeErr |
Indicates an error when the requested mode is not supported. |
ippStsSizeErr |
Indicates an error when width or height of the destination image is negative. |
ippStsStepErr |
Indicates an error when the step value is not data type multiple. |
ippStsOutOfRangeErr |
Indicates an error when the destination image offset point is outside the destination image origin. |
ippStsSizeWrn |
Indicates a warning when the destination image size is more than the destination image origin size. |
Example
/*******************************************************************************
* Copyright 2015 Intel Corporation.
*
*
* This software and the related documents are Intel copyrighted materials, and your use of them is governed by
* the express license under which they were provided to you ('License'). Unless the License provides otherwise,
* you may not use, modify, copy, publish, distribute, disclose or transmit this software or the related
* documents without Intel's prior written permission.
* This software and the related documents are provided as is, with no express or implied warranties, other than
* those that are expressly stated in the License.
*******************************************************************************/
// A simple example of changing an image size by different interpolation
// methods with antialiasing technique using Intel(R) Integrated Performance Primitives (Intel(R) IPP) functions:
// ippiResizeGetSize_8u
// ippiResizeAntialiasingLinearInit
// ippiResizeGetBufferSize_8u
// ippiResizeAntialiasing_8u_C3R
#include <stdio.h>
#include "ipp.h"
#define SRC_WIDTH 128 /* source image width */
#define SRC_HEIGHT 64 /* source image height */
#define DST_WIDTH 64 /* source image width */
#define DST_HEIGHT 128 /* source image height */
/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine: /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) IPP function returned status different from ippStsNoErr */
/* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */
int main(void)
{
IppStatus status = ippStsNoErr;
Ipp8u* pSrc = NULL, *pDst = NULL; /* Pointers to source/destination images */
int srcStep = 0, dstStep = 0; /* Steps, in bytes through the source/destination images */
IppiSize srcSize = { SRC_WIDTH, SRC_HEIGHT }; /* Size of source ROI in pixels */
IppiSize dstSize = { DST_WIDTH, DST_HEIGHT }; /* Size of destination ROI in pixels */
Ipp8u *pBuffer = NULL; /* Pointer to the work buffer */
IppiResizeSpec_32f *pSpec = NULL;
Ipp8u *pInit = NULL;
int specSize = 0, initSize = 0, bufSize = 0;
IppiPoint dstOffset = { 0, 0 };
IppiInterpolationType interpolation = ippLinear;
IppiBorderType borderType = ippBorderRepl;
pSrc = ippiMalloc_8u_C3(srcSize.width, srcSize.height, &srcStep);
pDst = ippiMalloc_8u_C3(dstSize.width, dstSize.height, &dstStep);
/* Calculation of work buffer size */
check_sts( status = ippiResizeGetSize_8u(srcSize, dstSize, interpolation, 1, &specSize, &initSize) )
/* Memory allocation */
pSpec = (IppiResizeSpec_32f*)ippsMalloc_8u(specSize + initSize);
pInit = (Ipp8u*)pSpec + initSize;
/* Filter initialization */
check_sts( status = ippiResizeAntialiasingLinearInit(srcSize, dstSize, pSpec, pInit) )
check_sts( status = ippiResizeGetBufferSize_8u(pSpec, dstSize, 3, &bufSize) )
pBuffer = ippsMalloc_8u(bufSize);
/* Function call */
check_sts( status = ippiResizeAntialiasing_8u_C3R(pSrc, srcStep, pDst, dstStep, dstOffset, dstSize, borderType, 0, pSpec, pBuffer) )
EXIT_MAIN
ippiFree(pSrc);
ippiFree(pDst);
ippsFree(pSpec);
ippsFree(pBuffer);
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}
The figure below demonstrates the results of reducing a 1751x1044 image by five times with antialiasing (a) and without (b).