Blurs an image
img_out = GaussianBlur(img_in, ksize, sigmaX[, sigmaY[, borderType]])
Input image (Mat).
Kernel size (double 1x2 matrix).
Gaussian kernel standard deviation in X direction (double).
Gaussian kernel standard deviation in Y direction (double) (default 0, in that case sigmaY equals to sigmaX)
Pixel extrapolation method (double) (default BORDER_DEFAULT).
Output image (Mat).
GaussianBlur
blurs an image using a Gaussian filter.