Developer Reference

  • 2021
  • 03/26/2021
  • Public Content
Contents

GetRotateTransform

Computes the affine coefficients for the rotation transform.

Syntax

IppStatus ippiGetRotateTransform(double
angle
, double
xShift
, double
yShift
, double
coeffs
[2][3]
);
Include Files
ippi.h
Flavors with the
_L
suffix:
ippi_l.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.lib
Parameters
angle
Angle of rotation, in degrees. The source image is rotated counterclockwise around the origin (0, 0).
xShift
,
yShift
Shift along horizontal (
x
) or vertical (
y
) axis that is performed after rotation.
coeffs
Computed affine transform coefficients for the given rotation parameters.
Description
This function computes the coefficients for the affine transform that rotates an image by the specified angle around the origin (0, 0) and shifts the image after rotation. The result is stored in the
coeffs
parameter.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error.
ippStsSizeErr
Indicates an error when one of the
coeffs
values is
NULL
.
ippStsOutOfRangeErr
Indicates an error when
angle
is not-a-number (NaN) or infinity.

Example

/******************************************************************************* * Copyright 2015-2021 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 computing the affine coefficients for the transform // that rotates an image using Intel(R) Integrated Primitives (Intel(R) IPP) functions: // ippiGetRotateTransform // ippiWarpAffineLinearInit // ippiWarpGetBufferSize // ippiWarpAffineLinear_8u_C3R #include <stdio.h> #include "ipp.h" #define WIDTH 64 /* source image width */ #define HEIGHT 64 /* source image height */ #define NUM_CHN 3 /* 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; IppiWarpSpec* pSpec = NULL; /* Pointer to the specification structure */ IppiSize srcSize = { WIDTH, HEIGHT }, dstSize = { WIDTH, HEIGHT }; /* Size of source/destination images */ int srcStep, dstStep; /* Steps, in bytes, through the source/destination images */ Ipp8u* pSrc = NULL, *pDst = NULL; /* Pointers to source/destination images */ double angle = 30., xShift = 2., yShift = 1.; double coeffs[2][3] = {0}; IppiPoint dstOffset = { 0, 0 }; /* Offset of the destination image ROI with respect to the destination image origin */ int specSize = 0, initSize = 0, bufSize = 0; /* Work buffer size */ Ipp8u* pBuffer = NULL; IppiBorderType borderType = ippBorderConst; IppiWarpDirection direction = ippWarpForward; /* Transformation direction */ Ipp64f pBorderValue[NUM_CHN] = {0}; pSrc = ippiMalloc_8u_C3(srcSize.width, srcSize.height, &srcStep); pDst = ippiMalloc_8u_C3(dstSize.width, dstSize.height, &dstStep); check_sts( status = ippiGetRotateTransform(angle, xShift, yShift, (double(*)[3])coeffs) ) /* Spec and init buffer sizes */ check_sts( status = ippiWarpAffineGetSize(srcSize, dstSize, ipp8u, coeffs, ippLinear, direction, borderType, &specSize, &initSize) ) pSpec = (IppiWarpSpec*)ippsMalloc_8u(specSize); /* Filter initialization */ check_sts( status = ippiWarpAffineLinearInit(srcSize, dstSize, ipp8u, coeffs, direction, NUM_CHN, borderType, pBorderValue, 0, pSpec) ) /* Get work buffer size */ check_sts( status = ippiWarpGetBufferSize(pSpec, dstSize, &bufSize) ) pBuffer = ippsMalloc_8u(bufSize); /* WarpAffine processing */ check_sts( status = ippiWarpAffineLinear_8u_C3R(pSrc, srcStep, pDst, dstStep, dstOffset, dstSize, pSpec, pBuffer) ) EXIT_MAIN ippiFree(pSrc); ippiFree(pDst); ippsFree(pBuffer); ippsFree( pSpec); printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status)); return (int)status; }

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.