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added help and help on error

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This commit is contained in:
Gary Bradski 2010-12-01 01:59:39 +00:00
parent 61c77e8e92
commit 0ebd45e188
1 changed files with 22 additions and 5 deletions
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27
samples/cpp/video_homography.cpp
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@ -16,6 +16,17 @@
using namespace std;
using namespace cv;
void help(char **av)
{
cout << "\n This program demonstrated the use of features2d with the Fast corner detector and brief descriptors\n"
<< "to track planar objects by computing their homography from the key (training) image to the query (test) image\n\n" << endl;
cout << "usage: " << av[0] << " <video device number>\n" << endl;
cout << "The following keys do stuff:" << endl;
cout << " t : grabs a reference frame to match against" << endl;
cout << " l : makes the reference frame new every frame" << endl;
cout << " q or escape: quit" << endl;
}
namespace
{
void drawMatchesRelative(const vector<KeyPoint>& train, const vector<KeyPoint>& query,
@ -37,6 +48,7 @@ void drawMatchesRelative(const vector<KeyPoint>& train, const vector<KeyPoint>&
}
}
//Takes a descriptor and turns it into an xy point
void keypoints2points(const vector<KeyPoint>& in, vector<Point2f>& out)
{
out.clear();
@ -47,6 +59,7 @@ void keypoints2points(const vector<KeyPoint>& in, vector<Point2f>& out)
}
}
//Takes an xy point and appends that to a keypoint structure
void points2keypoints(const vector<Point2f>& in, vector<KeyPoint>& out)
{
out.clear();
@ -57,6 +70,7 @@ void points2keypoints(const vector<Point2f>& in, vector<KeyPoint>& out)
}
}
//Uses computed homography H to warp original input points to new planar position
void warpKeypoints(const Mat& H, const vector<KeyPoint>& in, vector<KeyPoint>& out)
{
vector<Point2f> pts;
@ -67,6 +81,7 @@ void warpKeypoints(const Mat& H, const vector<KeyPoint>& in, vector<KeyPoint>& o
points2keypoints(pts_w, out);
}
//Converts matching indices to xy points
void matches2points(const vector<KeyPoint>& train, const vector<KeyPoint>& query,
const std::vector<cv::DMatch>& matches, std::vector<cv::Point2f>& pts_train,
std::vector<Point2f>& pts_query)
@ -96,13 +111,14 @@ void resetH(Mat&H)
H = Mat::eye(3, 3, CV_32FC1);
}
}
int main(int ac, char ** av)
{
if (ac != 2)
{
cout << "usage: " << av[0] << " <video device number>" << endl;
return 1;
help(av);
return 1;
}
BriefDescriptorExtractor brief(32);
@ -111,7 +127,8 @@ int main(int ac, char ** av)
capture.open(atoi(av[1]));
if (!capture.isOpened())
{
cout << "capture device " << atoi(av[1]) << " failed to open!" << endl;
help(av);
cout << "capture device " << atoi(av[1]) << " failed to open!" << endl;
return 1;
}
@ -147,9 +164,9 @@ int main(int ac, char ** av)
cvtColor(frame, gray, CV_RGB2GRAY);
detector.detect(gray, query_kpts);
detector.detect(gray, query_kpts); //Find interest points
brief.compute(gray, query_kpts, query_desc);
brief.compute(gray, query_kpts, query_desc); //Compute brief descriptors at each keypoint location
if (!train_kpts.empty())
{