opencv绘制基本形状的二值图像

        二值图像的创建很容易，本文绘制有阶跃梯度的边缘图像，为后面的实验做准备，黑色变白色以及白色变黑色便会产生明显边缘。

本文还绘制了倾斜的边缘。

首先，创建左右黑白二值图像：

#include<iostream>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
int main()
{
	Mat src(Size(200,200),CV_8UC1,Scalar::all(0));
	//src(Range::all(),Range(0,100))=255;
	src(Range::all(),Range(101,200))=255;
	imshow("src",src);
	waitKey(0);
	system("pause");
	return 0;
}

                              fig.1

 
                                 fig.2

然后，创建上下黑白二值图像：

#include<iostream>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
int main()
{
	Mat src(Size(200,200),CV_8UC1,Scalar::all(0));
	//src(Range(101,200),Range::all())=255;
	src(Range(0,100),Range::all())=255;
	imshow("src",src);
	waitKey(0);
	system("pause");
	return 0;
}

                             fig.3

                           fig.4

再然后绘制斜对角线图像：

#include<iostream>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
int main()
{
	Mat src(Size(200,200),CV_8UC1,Scalar::all(0));
	int center_x=src.cols/2;
	int center_y=src.rows/2;
	const double k=1.0;
	for (int j=0;j<src.rows;j++)
	{
		int y=k*(j-center_x)+center_y;
		//src(Range(0,j),Range(y,200))=255;
		src(Range(j,200),Range(0,y))=255;
	}
	imshow("src",src);
	waitKey(0);
	system("pause");
	return 0;
}

                        fig.5

                        fig.6

改变起始点斜对角线：

#include<iostream>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
int main()
{
	Mat src(Size(200,200),CV_8UC1,Scalar::all(0));
	int center_x=src.cols/2;
	int center_y=src.rows/2;
	const double k=0.5;
	for (int j=0;j<src.rows;j++)
	{
		int y=k*(j-center_x)+center_y;
		//src(Range(0,j+1),Range(y,200))=255;    
		src(Range(j,200),Range(0,y))=255;
	}
	imshow("src",src);
	imwrite("13.bmp",src);
	waitKey(0);
	system("pause");
	return 0;
}

                        fig.7

                       fig.8

相反方向：

#include<iostream>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
int main()
{
	Mat src(Size(200,200),CV_8UC1,Scalar::all(0));
	int center_x=src.cols/2;
	int center_y=src.rows/2;
	const double k=-0.5;
	for (int j=0;j<src.rows;j++)
	{
		int y=k*(j-center_x)+center_y;
		src(Range(0,j+1),Range(0,y))=255;    
		//src(Range(j,200),Range(y,200))=255;
	}
	imshow("src",src);
	imwrite("10.bmp",src);
	waitKey(0);
	system("pause");
	return 0;
}

                        fig.9

                        fig.10

    到此，基本的二值图像绘制完毕

    模糊边缘待补充~~~