Hi Matthieu,
Thank you for your suggestion. Yes, we recomment to use ippiMirror to do special rotation like 90,180,270.
To mahantesh,
if use ippiRotate, the no-intergate interpolation, round issue are unavaidable. ippiRotate provide one parameter IPPI_SMOOTH_EDGE to make edge look better. But the black strips may still visiable. how width of the strips in your test? does it affect your result?
Here is small piece of code for your reference.
IppiSize srcTempSize = {w, h};
IppiSize dstTempSize = {h, w};
IppiRect srcTempRect = { 0, 0,w, h };
IppiRect dstTempRect = { 0, 0,h, w };
double xTempShift = 0.0;
double yTempShift = 1.0*w; // conterwise rotate 90 degree, origin (0, 0) will be (0, w) after rotation, so the y shift is w
/* Use this function if you need to rotate an image about an arbitrary center (xCenter, yCenter) rather than the origin (0,0), we will rotate the image by 0, 0 first, so it is not necessary to call it here
/*
//ippiGetRotateShift(0.0, 0.0, 90.0, &xTempShift, &yTempShift);
ippiSet_8u_C4R ( 0, (Ipp8u*) dstTemp->imageData, dstTemp->widthStep, dstTempSize );
status=ippiRotate_8u_C4R ( (Ipp8u*) srcTemp->imageData, srcTempSize, srcTemp->widthStep, srcTempRect,
(Ipp8u*) dstTemp->imageData, dstTemp->widthStep, dstTempRect, 90.0,
xTempShift, yTempShift, IPPI_INTER_LINEAR|IPPI_SMOOTH_EDGE);
//my test: the rotate operation will show 1 pixel width black line on upper of the rotated image)
Best Regards,
Ying
