#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
int main(int agrc, char** agrv)
{
	Mat src = imread("lian.jpg");
	if (!src.data)
	{
		printf("can't load\n");
		return -1;
	}
	imshow("input image", src);

	Mat dst = Mat::zeros(src.size(), src.type());
	int offsetx = src.channels();
	for (int row = 1; row < src.rows - 1; row++)
	{
		const uchar* current = src.ptr<uchar>(row);
		const uchar* preview = src.ptr<uchar>(row - 1);
		const uchar* next = src.ptr<uchar>(row + 1);
		uchar* output = dst.ptr<uchar>(row);
		for (int col = offsetx; col < (src.cols - 1) * src.channels();col++)
		{
			output[col] = saturate_cast<uchar>(5 * current[col] - (current[col + offsetx]  + current[col - offsetx]  + preview[col] + next[col]));
		}

	}
	imshow("ouput image", dst);

	Mat dst1 = Mat::zeros(src.size(), src.type());
	Mat kernel = (Mat_<char>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
	filter2D(src, dst1, src.depth(), kernel);
	imshow("ouput image2", dst1);

	waitKey(0);
	return 0;
}

	double t = getTickCount();
	
	double tt = (getTickCount() - t) / getTickFrequency();
	printf("%.2f", tt);