OpenCV學習筆記(1)
(1)圖片顯示
#include<iostream>
#include<opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
char *filename = "C:/Users/Administrator/Desktop/picture/1.jpg";
Mat Image = imread(filename, IMREAD_UNCHANGED); //從文件中讀取圖片
if (Image.data==NULL)
{
return -1;
}
namedWindow("Example1", WINDOW_AUTOSIZE);
imshow("Example1", Image); //顯示窗口
waitKey(0);
return 0;
}
(2)視頻顯示
#include<iostream>
#include<opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
VideoCapture capture(string("C:Users/Administrator/Desktop/picture/fff.avi"));
if (!capture.isOpened())
{
std::cout << "video not open." << std::endl;
return 1;
}
//獲取當前視頻幀率
double rate = capture.get(CV_CAP_PROP_FPS);
//當前視頻幀
Mat frame;
//每一幀之間的延時
//與視頻的幀率相對應
int delay = 1000 / rate;
bool stop(false);
while (!stop)
{
if (!capture.read(frame))
{
cout << "no video frame" << endl;
break;
}
//此處爲添加對視頻的每一幀的操作方法
int frame_num = capture.get(CV_CAP_PROP_POS_FRAMES);
cout << "Frame Num : " << frame_num << endl;
if (frame_num == 20)
{
capture.set(CV_CAP_PROP_POS_FRAMES, 10);
}
imshow("video", frame);
//引入延時
//也可通過按鍵停止
if (waitKey(delay)>0)
stop = true;
}
//關閉視頻,手動調用析構函數(非必須)
capture.release();
}
注:一開始視頻顯示不了,隨後通過查閱資料發現,整個項目缺少Opencv_ffmpeg_64.dll文件,放入項目中即可。
(3)邊緣檢測
#include<iostream>
#include<opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
Mat ImageIn;
VideoCapture cap(0); //從攝像頭中讀取圖像數據
while (true)
{
cap >> ImageIn;
imshow("ExampleIn", ImageIn);
Mat ImageOut1;
Canny(ImageIn, ImageOut1, 40, 140, 3, true); //邊緣檢測
imshow("ExampleOut1", ImageOut1);
waitKey(20);
}
return 0;
}
上面絕大多數代碼都是我在學習《學習OPenCV3》時參(chao)考(xie)的代碼。