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opencv c++矩阵掩模操作

程序员文章站 2024-03-25 10:32:22
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#include<opencv2\opencv.hpp>
#include<iostream>
#include<math.h>

using namespace cv;
int main()
{
	Mat dst;
	Mat src = imread("C:/Users/asus/Desktop/tupian/1.jpg");
	if (src.empty())
	{
		printf("could not load image...\n");
		return -1;
	}
	namedWindow("opencv setup demo", WINDOW_AUTOSIZE);
	imshow("opencv setup demo", src);
	int cols = (src.cols-1)*src.channels();
	int offsetx = src.channels();
	int rows = src.rows;
	dst = Mat::zeros(src.size(), src.type());
	for (int row = 1; row < (rows - 1); row++)
	{
		const uchar* previous = src.ptr<uchar>(row - 1);
		const uchar* current = src.ptr<uchar>(row);
		const uchar* next = src.ptr<uchar>(row + 1);
		uchar* output  = dst.ptr<uchar>(row );
		for (int col = offsetx; col < cols; col++)
		{
			output[col] = saturate_cast<uchar>(5 * current[col] - (current[col- offsetx]+ current[col + offsetx]+ previous[col]+ next[col]));
		}
	}
	namedWindow("dst", WINDOW_AUTOSIZE);
	imshow("dst", dst);
	waitKey(0);
	return 0;
	
}
#include<opencv2\opencv.hpp>
#include<iostream>
#include<math.h>

using namespace cv;
int main()
{
	Mat dst;
	Mat src = imread("C:/Users/asus/Desktop/tupian/1.jpg");
	if (src.empty())
	{
		printf("could not load image...\n");
		return -1;
	}
	namedWindow("opencv setup demo", WINDOW_AUTOSIZE);
	imshow("opencv setup demo", src);
	double t = getTickCount();
	Mat kennel = (Mat_<char>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
	filter2D(src, dst, src.depth(), kennel);
	double timeconsume = (getTickCount() - t) / getTickFrequency();
	printf("tim %.4f", timeconsume);
	namedWindow("dst", WINDOW_AUTOSIZE);
	imshow("dst", dst);
	waitKey(0);
	return 0;
	
}