Hi, all:

1)
I happened to notice that
a) OpenCV C++
there are
cv::pyrDown() and cv::pyrUp()
b) OpenCV C
there is only
cvPyrDown() but no cvPyrUp()

2) the performance of
pyrDown(image, pyr, Size(image.cols/2, image.rows/2));
pyrUp(pyr, timg, image.size());
is much much much better than that of a single
cvSmooth(img, smoothedimg, CV_GAUSSIAN, 5, 5, 0, 0);

3) my current project required me to implement everything in C, without C++

Therefore, I'm wondering if current OpenCV Standard C affords a similar function cvPyrUp() ?

Thank you very much.

Best Regards
Pei