c++ opencv 常用指令
1. 指针
1) 定义指针最后要删除
float *p = new float[9];
delete []p;
2. 图片
1) 显示、销毁窗口和保存
itoa(i+1,mid,10);
namedWindow(mid,0); //0为适应窗口大小
imshow(mid,views[i]);
waitKey(); // waitKey()等待用户输入，可显示出图片
destroyWindow(mid); //销毁窗口
road =prefix+mid+end;
imwrite(road,views[i]);
3. Mat:
1) Mat初始化：
Mat cammat =Mat::eye(3, 3, CV_32F);
Mat discoeff =Mat::zeros(8, 1, CV_32F);
2) 图像元素的访问
三通道：
Vec3i bgr =mat_CV_8UC3.at<Vec3b>(nrow,ncol);
bgr.val[0];bgr.val[1]; bgr.val[2]; 分别代表蓝绿红
单通道：
uchar val =mat_CV_8UC1.at<uchar>(nrow,ncol);
int(val); 灰度值
4. Vector
头文件 #include<vector>
1) 定义：vector<Mat> views; 矩阵数组
vector< vector< Point2f > > pts2; 2维点的数组
| P1x |
P2x |
P3x |
P4x |
| P1y |
P2y |
P3y |
P4y |
vector<vector< Point3f > > pts3; 3维点的数组
| P1x |
P2x |
P3x |
P4x |
| P1y |
P2y |
P3y |
P4y |
| P1z |
P2z |
P3z |
P4z |
2) Vector元素的添加 :push_back()
For(i=0;i<N;i++){
Mat tempview=Mat::zeros(views[i].size(),CV_8UC1); //tempview每次需重新定义，因为Mat的push_back函数只能加const量
cvtColor(views[i],tempview,CV_RGB2GRAY);
grayviews.push_back(tempview);
}
3) Vector 元素访问：
Views.at<CV_8UC3>(i) 或 Views.at<Vec3b>(i)
Views.at<CV_8UC1>(i) 或 Views.at<uchar>(i)
或views[i]
5. GUI交互
1）控制台中鼠标响应事件，提取匹配角点
HANDLE ih = GetStdHandle(STD_INPUT_HANDLE);
HANDLE oh = GetStdHandle(STD_OUTPUT_HANDLE);
INPUT_RECORDirc;
DWORD res;
COORD cp;
cp.X = 0;
cp.Y = 0;
intret = SetConsoleCursorPosition(oh,cp);
while(1){
ReadConsoleInput(ih,&irc,1,&res);
if(res==1){
if(irc.EventType==MOUSE_EVENT){
if(irc.Event.MouseEvent.dwEventFlags== DOUBLE_CLICK){
MOUSE_EVENT_RECORD mrc =irc.Event.MouseEvent;
cp.X = mrc.dwMousePosition.X;
cp.Y = mrc.dwMousePosition.Y;
}}}}}
2）opencv图像中提取角点
#include <highgui.h>
void onMouse(int Event,int x,int y,int flags,void*param)
{
if(Event==4){
cout<<x<<" "<<y<<endl;
}
}
main(){
CvCapture *capture=NULL;
IplImage *frame;
cvNamedWindow("im1",0);
Matim1;
im1=imread("Data/1a.jpg");
imshow("im1",im1);
waitKey(10);
cvSetMouseCallback("im1",onMouse,NULL);
//刷新图像1
while(true){
frame = cvQueryFrame(capture);
cvShowImage("im1",frame);
if(cvWaitKey(10)>=0){
break;
}}
6.1 文件夹下的文件全部读取
#include<io.h>
//定义
_finddata_t file; //_finddata_t 结构体里存储的是文件信息
char* szFilePack;
longIF; //读取文件的句柄
//通配符: /*
szFilePack ="rawimage//*.jpg";
//循环读取
if((IF= _findfirst(szFilePack, &file))== -1){
cout<<"cannot findpinholerawimage"<<endl;
}
else{
while(!_findnext(IF, &file) ) {
cout<<file.name;
}
}
_findclose(IF);
6.2 文件读取方法2
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main()
{
int seq = 1;
string end = ".jpg";
string prefix = "D:\\";
stringstream sstr;
sstr << seq;
string com = prefix + sstr.str() + end;
cout << com << endl;
sstr.str("");
...
}