Specifications

Intel
®
Image Processing Library Reference Manual
11-16
11
Shear
Performs a shear of
the source image.
void iplShear(IplImage* srcImage , IplImage* dstImage , double xShear ,
double
yShear , double xShift , double yShift , int interpolate );
srcImage Thesourceimage.
dstImage The resultant image.
xShear, yShear The shear coefficients.
xShift, yShift Additional shift values for the x and y directions.
interpolate The type of interpolation to perform for
resampling. Can be one of the following:
IPL_INTER_NN Nearest neighbor.
IPL_INTER_LINEAR Linear interpolation.
IPL_INTER_CUBIC Cubic interpolation.
+IPL_SMOOTH_EDGE Smooth edges of an image.
Can be added to interpolation
by using bitwise logical OR
(see Appendix B for details).
Discussion
The function iplShear() performs a shear of the source image according
to the following formulas:
x’ = x + xShear ·y + xShift
y’ = y + yShear ·x + yShift
where x and y denote the original pixel coordinates; x’ and y’ denote the
pixel coordinates in the sheared image. This shear transform is a special
case of affine transform performed by
iplWarpAffine (see below).
The interpolation specified by
interpolate is used for resampling the
input image.