Use GaussianBlur with OpenCV

gistfile1.cpp

void proccessImage(std::vector<unsigned char>& imageData, int width, int height)
{
	Mat src(width, height, CV_8UC4, const_cast<unsigned char*>(imageData.data()));
	Mat src_gray, final;

	// Convert the source image to gray
	cvtColor(src, src_gray, CV_BGRA2GRAY);

	// Apply gaussian blur on the gray image
	GaussianBlur(src_gray, src_gray, cv::Size(9, 9), 2, 2);

	// Convert the gray blur image to RGBA
	cvtColor(src_gray, final, CV_GRAY2RGBA);

	// Reform the std::vector from cv::Mat data
	std::vector<unsigned char> array;
	array.assign((unsigned char*)final.datastart, (unsigned char*)final.dataend);
	
	// Send final image data to GPU and draw it
}