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 | 1 | initial version |
createTrackbar should be outside while loop. trackbar is an empty function
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
Mat frame;
Mat frame2 ;
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
namedWindow("Image", 1);
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
while (1)
{
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(frame, frame2, COLOR_BGR2GRAY);
GaussianBlur(frame2, frame2, Size(5, 5), 0);
Canny(frame2, frame2, threshval, threshval * 2, 3);
morphologyEx(frame2, frame2, MORPH_CLOSE, Mat(), Point(-1, -1), 2);
Mat stat, centroid;
Mat bw = threshval < 128 ? (frame2< threshval) : (frame2 > threshval);
Mat labelImage(frame2.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label)
{
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));
}
Mat dst(frame2.size(), CV_8UC3);
for (int r = 0; r < dst.rows; ++r)
{
for (int c = 0; c < dst.cols; ++c)
{
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];
}
}
for (int i = 0; i < nLabels; i++)
{
if (stat.at<int>(i, CC_STAT_AREA) <80 && stat.at<int>(i, CC_STAT_AREA) >10)
{
putText(frame2,"mitter",Point(10,30),FONT_HERSHEY_SIMPLEX,1,Scalar(128));
break;
}
}
imshow("Image", frame2);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
| | 2 | No.2 Revision |
createTrackbar should be outside while loop. trackbar is an empty function
#include <opencv2/opencv.hpp>
<opencv2/opencv.hpp> ddddddd
using namespace std;
using namespace cv;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
Mat frame;
Mat frame2 ;
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
namedWindow("Image", 1);
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
while (1)
{
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(frame, frame2, COLOR_BGR2GRAY);
GaussianBlur(frame2, frame2, Size(5, 5), 0);
Canny(frame2, frame2, threshval, threshval * 2, 3);
morphologyEx(frame2, frame2, MORPH_CLOSE, Mat(), Point(-1, -1), 2);
Mat stat, centroid;
Mat bw = threshval < 128 ? (frame2< threshval) : (frame2 > threshval);
Mat labelImage(frame2.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label)
{
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));
}
Mat dst(frame2.size(), CV_8UC3);
for (int r = 0; r < dst.rows; ++r)
{
for (int c = 0; c < dst.cols; ++c)
{
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];
}
}
for (int i = 0; i < nLabels; i++)
{
if (stat.at<int>(i, CC_STAT_AREA) <80 && stat.at<int>(i, CC_STAT_AREA) >10)
{
putText(frame2,"mitter",Point(10,30),FONT_HERSHEY_SIMPLEX,1,Scalar(128));
break;
}
}
imshow("Image", frame2);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
| | 3 | No.3 Revision |
createTrackbar should be outside while loop. trackbar is an empty function
#include <opencv2/opencv.hpp> ddddddd
using namespace std;
using namespace cv;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
Mat frame;
Mat frame2 ;
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
namedWindow("Image", 1);
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
while (1)
{
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(frame, frame2, COLOR_BGR2GRAY);
GaussianBlur(frame2, frame2, Size(5, 5), 0);
Canny(frame2, frame2, threshval, threshval * 2, 3);
morphologyEx(frame2, frame2, MORPH_CLOSE, Mat(), Point(-1, -1), 2);
Mat stat, centroid;
Mat bw = threshval < 128 ? (frame2< threshval) : (frame2 > threshval);
Mat labelImage(frame2.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label)
{
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));
}
Mat dst(frame2.size(), CV_8UC3);
for (int r = 0; r < dst.rows; ++r)
{
for (int c = 0; c < dst.cols; ++c)
{
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];
}
}
for (int i = 0; i < nLabels; i++)
{
if (stat.at<int>(i, CC_STAT_AREA) <80 && stat.at<int>(i, CC_STAT_AREA) >10)
{
putText(frame2,"mitter",Point(10,30),FONT_HERSHEY_SIMPLEX,1,Scalar(128));
break;
}
}
imshow("Image", frame2);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
| | 4 | No.4 Revision |
createTrackbar should be outside while loop. trackbar is an empty function
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
Mat frame;
Mat frame2 ;
Mat text(100,500,CV_8UC1);
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
namedWindow("Image", 1);
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
while (1)
{
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(frame, frame2, COLOR_BGR2GRAY);
GaussianBlur(frame2, frame2, Size(5, 5), 0);
Canny(frame2, frame2, threshval, threshval * 2, 3);
morphologyEx(frame2, frame2, MORPH_CLOSE, Mat(), Point(-1, -1), 2);
Mat stat, centroid;
Mat bw = threshval < 128 ? (frame2< threshval) : (frame2 > threshval);
Mat labelImage(frame2.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label)
{
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));
}
Mat dst(frame2.size(), CV_8UC3);
for (int r = 0; r < dst.rows; ++r)
{
for (int c = 0; c < dst.cols; ++c)
{
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];
}
}
bool detection=false;
for (int i = 0; i < nLabels; i++)
{
{
if (stat.at<int>(i, CC_STAT_AREA) <80 && stat.at<int>(i, CC_STAT_AREA) >10)
{
{
putText(frame2,"mitter",Point(10,30),FONT_HERSHEY_SIMPLEX,1,Scalar(128));
detection=true;
break;
}
}
}
}
text.setTo(0);
if (detection)
putText(text, "detection true", Point(10, 40), FONT_HERSHEY_SIMPLEX, 1, Scalar(128));
else
putText(text, "detection false", Point(10, 40), FONT_HERSHEY_SIMPLEX, 1, Scalar(128));
imshow("text", text);
imshow("Image", frame2);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
| | 5 | No.5 Revision |
createTrackbar should be outside while loop. trackbar is an empty function
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
Mat frame;
Mat frame2 ;
Mat text(100,500,CV_8UC1);
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
namedWindow("Image", 1);
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
while (1)
{
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(frame, frame2, COLOR_BGR2GRAY);
GaussianBlur(frame2, frame2, Size(5, 5), 0);
Canny(frame2, frame2, threshval, threshval * 2, 3);
morphologyEx(frame2, frame2, MORPH_CLOSE, Mat(), Point(-1, -1), 2);
Mat stat, centroid;
Mat bw = threshval < 128 ? (frame2< threshval) : (frame2 > threshval);
Mat labelImage(frame2.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label)
{
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));
}
Mat dst(frame2.size(), CV_8UC3);
for (int r = 0; r < dst.rows; ++r)
{
for (int c = 0; c < dst.cols; ++c)
{
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];
}
}
bool detection=false;
for (int i = 0; i < nLabels; i++)
{
if (stat.at<int>(i, CC_STAT_AREA) <80 && stat.at<int>(i, CC_STAT_AREA) >10)
{
putText(frame2,"mitter",Point(10,30),FONT_HERSHEY_SIMPLEX,1,Scalar(128));
detection=true;
break;
}
}
text.setTo(0);
if (detection)
putText(text, "detection true", Point(10, 40), FONT_HERSHEY_SIMPLEX, 1, Scalar(128));
else
putText(text, "detection false", Point(10, 40), FONT_HERSHEY_SIMPLEX, 1, Scalar(128));
imshow("text", text);
imshow("Image", frame2);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
| | 6 | No.6 Revision |
createTrackbar should be outside while loop. trackbar is an empty function
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
Mat frame;
Mat frame2 ;
Mat text(100,500,CV_8UC1);
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
namedWindow("Image", 1);
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
while (1)
{
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(frame, frame2, COLOR_BGR2GRAY);
GaussianBlur(frame2, frame2, Size(5, 5), 0);
Canny(frame2, frame2, threshval, threshval * 2, 3);
morphologyEx(frame2, frame2, MORPH_CLOSE, Mat(), Point(-1, -1), 2);
Mat stat, centroid;
Mat bw = threshval < 128 ? (frame2< threshval) : (frame2 > threshval);
Mat labelImage(frame2.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label)
{
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));
}
Mat dst(frame2.size(), CV_8UC3);
for (int r = 0; r < dst.rows; ++r)
{
for (int c = 0; c < dst.cols; ++c)
{
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];
}
}
bool detection=false;
for (int i = 0; i < nLabels; i++)
{
if (stat.at<int>(i, CC_STAT_AREA) <80 && stat.at<int>(i, CC_STAT_AREA) >10)
{
putText(frame2,"mitter",Point(10,30),FONT_HERSHEY_SIMPLEX,1,Scalar(128));
detection=true;
break;
}
}
text.setTo(0);
if (detection)
putText(text, "detection true", Point(10, 40), FONT_HERSHEY_SIMPLEX, 1, Scalar(128));
else
putText(text, "detection false", Point(10, 40), FONT_HERSHEY_SIMPLEX, 1, Scalar(128));
imshow("text", text);
imshow("Image", frame2);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}