Hi, ı want to compare two images and if there is any difference ı want to get 1 or 0 in C++ language like this video https://www.youtube.com/watch?v=LNzC4...
difference = cv2.subtract(img1,img2);
in C++ above code does not give any integer value, what should ı write instead of this code?
If you are using c++, cv::subtract give you a Mat with tons of pixels value but not a single value which tell you how many non zero pixels in the matrix. You can call countNonZero in c++ to count the number of non zero pixels.
auto const diff= img1 != img2;
if(countNonZero(dst) == 0){
cout<<"this is same picture"<<endl;
}else{
cout<<"this is not the same picture"<<endl;
}
You can use stl algorithm and iterator to do the comparison too. I do not know which one is faster, you better run some test on it.
bool const equal = std::equal(img1.begin<uchar>(), img1.end<uchar>(), img2.begin<uchar>());
If you want to compare similarity of images with different size, try out img_hash module of opencv_contrib.
Edit : I replace subtraction by comparison, it is easier to read and avoid the problem of value clip.
using namespace cv; using namespace std;
int main(){
Mat img1,img2,dst;
VideoCapture capture(0); // kamera aç
namedWindow("Camera",1);
Sleep(500);
while(1){
if(!capture.isOpened())
return -1;
capture.read(img1);
capture.read(img2);
absdiff(img1,img2,dst);
if(countNonZero(dst) == 0){
cout<<"there is no motion"<<endl;
}
else{
cout<<"there is a motion"<<endl;
}
imshow("Camera",img1);
if (waitKey(30) == 27)
{
cout << "ESC key is pressed by user" << endl;
break;
}
}
return 0;
}
my purpose is to perceive when any motion occour in camera
Asked: 2017-10-03 14:38:25 -0600
Seen: 7,452 times
Last updated: Oct 03 '17