openCV学习7-自定义线性滤波+处理边缘

1.自定义线性滤波

·拉普拉斯算子和掩膜的算子很像，一个中间是4，一个中间是5.但是结果会差很多。

#include <opencv2\core\core.hpp>  
#include <opencv2\highgui\highgui.hpp>  
#include <opencv2\imgproc\imgproc.hpp>  
#include <opencv2\objdetect\objdetect.hpp>  
#include <opencv2\imgproc\types_c.h>  
#include <opencv2\objdetect\objdetect_c.h>
#include<opencv2/opencv.hpp>
#include<iostream>
#include<cmath>
#include<cstdio>

using namespace std;
using namespace cv;

int main()
{
	Mat src,dst,dstx,dsty;
	src=imread("cat.jpg");
	if(src.empty())
	{
		cout<<"!!???"<<endl;
		return -1;
	}
	namedWindow("cat!",1);
	imshow("cat!",src);

	/*1.Robert
	//Robert算子(梯度算子),X方向
	namedWindow("R x",1);
	namedWindow("R y",1);
	Mat kernelx=(Mat_<int>(2,2)<<1,0,0,-1);
	filter2D(src,dstx,-1,kernelx,Point(-1,-1),0.0);
	imshow("R x",dstx);

	//Robert算子,Y方向
	Mat kernely=(Mat_<int>(2,2)<<0,1,-1,0);
	filter2D(src,dsty,-1,kernely,Point(-1,-1),0.0);
	imshow("R y",dsty);
	*/

	/*2.Sobel
	//Sobel算子x和y方向
	namedWindow("S x",1);
	namedWindow("S y",1);
	Mat sx,sy;
	Mat kernelx=(Mat_<int>(3,3)<<-1,0,1,-2,0,2,-1,0,1);
	filter2D(src,sx,-1,kernelx,Point(-1,-1),0.0);
	imshow("S x",sx);

	Mat kernely=(Mat_<int>(3,3)<<-1,-2,-1,0,0,0,1,2,1);
	filter2D(src,sy,-1,kernely,Point(-1,-1),0.0);
	imshow("S y",sy);
	*/

	/*
	//3.拉普拉斯算子
	namedWindow("Lap",1);
	Mat lap;
	Mat kernel=(Mat_<int>(3,3)<<0,-1,0,-1,4,-1,0,-1,0);
	filter2D(src,lap,-1,kernel,Point(-1,-1),0.0);
	imshow("Lap",lap);
	*/

	//自定义一个随着时间变化循环模糊~
	int c=0;
	int index=0;
	int ksize=3;
	while(true)
	{
		c=waitKey(500);
		if((char)c==27)//ESC键
			break;
		ksize=4+(index%5)*2+1;
		Mat kernel=Mat::ones(Size(ksize,ksize),CV_32F)/(float)(ksize*ksize);
		filter2D(src,dst,-1,kernel,Point(-1,-1),0.0);
		index++;
		imshow("out",dst);
	}

	waitKey(0);
	return 0;
}

2.处理边缘

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#include <opencv2\core\core.hpp>  
#include <opencv2\highgui\highgui.hpp>  
#include <opencv2\imgproc\imgproc.hpp>  
#include <opencv2\objdetect\objdetect.hpp>  
#include <opencv2\imgproc\types_c.h>  
#include <opencv2\objdetect\objdetect_c.h>
#include<opencv2/opencv.hpp>
#include<iostream>
#include<cmath>
#include<cstdio>

using namespace std;
using namespace cv;

int main()
{
	Mat src,dst;
	src=imread("cat.jpg");
	if(src.empty())
	{
		cout<<"!!???"<<endl;
		return -1;
	}
	namedWindow("cat!",1);
	imshow("cat!",src);
	namedWindow("out",1);

	int top=(int)(0.05*src.rows);
	int bottom=(int)(0.05*src.rows);
	int left=(int)(0.05*src.cols);
	int right=(int)(0.05*src.cols);
	RNG rng(12345);
	int bordertype=BORDER_DEFAULT;

	int c=0;
	while(true)
	{
		c=waitKey(500);
		if((char)c==27)
			break;
		if((char)c=='r')
		{
			bordertype=BORDER_REPLICATE;
		}
		else if((char)c=='w')
		{
			bordertype=BORDER_WRAP;
		}
		else if((char)c=='c')
		{
			bordertype=BORDER_CONSTANT;
		}
		else
		{
			bordertype=BORDER_DEFAULT;
		}
		Scalar color=Scalar(rng.uniform(0,255),rng.uniform(0,255),rng.uniform(0,255));
		copyMakeBorder(src,dst,top,bottom,left,right,bordertype,color);
		imshow("out",dst);
	}


	waitKey(0);
	return 0;
}