i'm using OpenCV 3.2 and trying to compile the following code using Visual studio 2013:
#include <opencv2/core/utility.hpp>
#include <opencv2/video/tracking.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
VideoCapture cap;
Mat frame;
cap.set(CV_CAP_PROP_FRAME_WIDTH, 160);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 120);
cap.set(CV_CAP_PROP_FPS, 15);
cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC('B', 'G', 'R', '3'));
cap = VideoCapture(0);
Ptr<Tracker> tracker = Tracker::create("KCF");
while (1){
cap.read(frame);
imshow("TEST", frame);
waitKey(1);
}
return 0;
}
But it tells me that tracker is undefined.i'm trying to use the example from Here.
the opencv2/tracking.hpp used there did not exist in my include directory so i added some files to fix including problems(required files were feature.hpp,onlineMIL.hpp,onlineBoosting.hpp,tracking.hpp. copied from opencv github) but still VS tells me that Tracker is undefined
Opencv had moved all these extension librarys to Opencv-contrib when the Version 3.0 published, you can install from the github website:
https://github.com/opencv/opencv_contrib
please be care for choose the version about this Repository .
Related
I am going through the book Learning OpenCV 3 and test out the video example 2.3. I could edit, compile and run it, but the problem is that it closed down immediately.
// DisplayPicture.cpp : Defines the entry point for the console application.
//
//#include "opencv2/opencv.hpp" // Include file for every supported OpenCV function
#include "opencv2\imgproc\imgproc.hpp"
#include "opencv2\highgui\highgui.hpp"
#include <opencv2/videoio.hpp>
#include <stdio.h>
#include <string.h>
using namespace cv;
using namespace std;
int main(int argc, char** argv) {
namedWindow("video3", WINDOW_AUTOSIZE);
VideoCapture cap;
cap.open( string(argv[1]));
int tell = 0;
Mat frame;
for (;;) {
cap >> frame;
//waitKey(30);
if (frame.empty())
{
break;
//end of film
}
imshow("video3", frame);
}
return 0;
}
I found that my computer processed the data too fast. It could not read the next frame fast enough. if (frame.empty()) became true the program reached the break statement and ended.
By adding a waitkey of 30 millisec before viewing the image frame, the video program works very well. At least I can view the video. Since this example is from the 'bible' it should work, but not with my computer.
I am running a MSI gt72 2PE computer with nvidia gtx880m. Not sure if that matters.
I assume that adding a waitKey(30) is not appropriate, so I am seeking suggestions as to what could be done differently.
Every time i compile this code the webcam streaming is mirrored like I lift up my right hand and it appears like if it was my left hand on the screen instead and after a couple of re-compiling an error message appeared and the code never worked again.
The error:
Unhandled exception at 0x00007FFB3C6DA1C8 in Camera.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000D18AD5F610.
And no other option left except to break the process.
The code:
#include <opencv2/highgui/highgui.hpp>
#include <opencv\cv.h>
using namespace cv;
int main(){
Mat image;
VideoCapture cap;
cap.open(1);
namedWindow("Window", 1);
while (1){
cap >> image;
imshow("window", image);
waitKey(33);
}
}
I don't know if something wrong with my code I've just started learning opencv !
#include <opencv2/highgui/highgui.hpp>
#include <opencv\cv.h>
using namespace cv;
int main(){
Mat image;
VideoCapture cap;
cap.open(1);
namedWindow("Window", 1);
while (1){
cap >> image;
flip(image,image,1)
imshow("window", image);
waitKey(33);
}
}
just Flip the image horizontally that will do Find More Here
There is nothing wrong when your image is mirrored on the vertical (/x) axis (I guess in your example you are using a built-in (laptop) webcam).
A (very) simple code for capturing and showing your image could be the following:
// imgcap in opencv3
#include "opencv2/highgui.hpp"
#include "opencv2/videoio.hpp"
int main() {
cv::VideoCapture cap(0); // camera 0
cv::Mat img;
while(true) {
cap >> img;
cv::flip(img,img,1);
cv::imshow("live view", img);
cv::waitKey(1);
}
return 0;
}
When using OpenCV 3 you should include headers like:
#include <opencv2/highgui.hpp>
I am trying to do a simple surf feature detection.
The problem is that during the execution I have two Microsoft Visual C++ Runtime Library Errors with only the use of the detect method :
Debug Assertion Failed ! Program:
C:\Windows\system32\MSVCP120D.dll File : C:\Program Files
(x86\Microsoft Visual Studio 12.0\VC\include\vector Line: 240
Expression : vector iterators incompatible
And
Debug Assertion Failed ! Program:
C:\opencv\build\x64\vc12\bin\Debug\opencv_xfeatures2d300d.dll File : C:\Program Files
(x86\Microsoft Visual Studio 12.0\VC\include\vector Line: 241
Expression : "Standard C++ Libraries Invalid Argument" && 0
This is the code :
#include "opencv2/core.hpp"
#include "opencv2/core/utility.hpp"
#include "opencv2/core/ocl.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/features2d.hpp"
#include "opencv2/calib3d.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/xfeatures2d.hpp"
#include "opencv/cv.h"
#include "opencv/highgui.h"
using namespace cv;
using namespace std;
using namespace xfeatures2d;
int main(int argc, const char** argv)
{
// Read image
Mat img1 = imread("box.png", CV_LOAD_IMAGE_GRAYSCALE);
Mat img2 = imread("box_in_scene.png", CV_LOAD_IMAGE_GRAYSCALE);
if (img1.empty() || img2.empty())
{
printf("Images non lisibles \n");
return -1;
}
// detecting keypoints
int hessian = 800;
Ptr<SURF> surf = SURF::create(hessian);
vector<KeyPoint> keypoints1, keypoints2;
surf->detect(img1, keypoints1);
surf->detect(img2, keypoints2);
waitKey(0);
return 0;
}
I successfully wrote a tool that converts an image's colors space from linear to sRGB, so opencv is working. Then i wanted to rescale the image with the cv::resize function to generate Thumbnails. However it didn't work, here is the reproduced code-snippet.
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace std;
int main( int argc, char** argv )
{
// Load images in the C++ format
cv::Mat img = cv::imread("something.jpg");
cv::Mat src = cv::imread("src.jpg");
// Resize src so that is has the same size as img
**cv::resize**(src, src, img.size());
return 0;
}
I am using OpenCV 2.4.8. What am i doing wrong?
you're lacking a header file:
#include "opencv2/imgproc/imgproc.hpp"
(ofc, you have to link opencv_imgproc, too)
#include "opencv2/opencv.hpp"
would have avoided the 1st error, but you still have to care for the correct libs
I wrote a simple program in OpenCV that detects SURF feature in a given image and diplays the detected features in a namedWindow.
#include <iostream>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>
#include <opencv2\features2d\features2d.hpp>
using namespace cv;
int main(int argc,char** argv)
{
if(argc!=3)//Check cmd number of argumets
{
std::cout<<"Usage: "<<argv[0]<<" <image-file> <method>"<<std::endl;
return -1;
}
//LOAD THE SOURCE IMAGE
Mat Img = imread(argv[1],CV_LOAD_IMAGE_GRAYSCALE);
if(!Img.data)//Check correct image load
{
std::cout<<"Cannot read image file. Check file path!"<<std::endl;
return -1;
}
//COMPUTE FEATURES
SurfFeatureDetector detector;
std::vector<KeyPoint> features;
detector.detect(Img,features);
//SHOW RESULT
Mat ImgF;
drawKeypoints(Img,features,ImgF);
namedWindow("Features", CV_GUI_NORMAL);
imshow("Features",ImgF);
waitKey();
return 0;
}
Everything is OK, the programs do what it have to do. The problem is when pressing a key to terminate the program a crash error occurs.
It doesn't crash for me... but in order for me to compile your code, I had to add
#include <opencv2/nonfree/features2d.hpp>
because SURF was moved to the nonfree module at some point.
So, I would have to recommend trying the newest version (2.4.6 as of today).