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113 lines
3.2 KiB
C++
113 lines
3.2 KiB
C++
/**
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* @file transformations.cpp
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* @brief Visualizing cloud in different positions, coordinate frames, camera frustums
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* @author Ozan Cagri Tonkal
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*/
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#include <opencv2/viz.hpp>
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#include <iostream>
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#include <fstream>
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using namespace cv;
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using namespace std;
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/**
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* @function help
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* @brief Display instructions to use this tutorial program
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*/
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static void help()
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{
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cout
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<< "--------------------------------------------------------------------------" << endl
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<< "This program shows how to use makeTransformToGlobal() to compute required pose,"
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<< "how to use makeCameraPose and Viz3d::setViewerPose. You can observe the scene "
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<< "from camera point of view (C) or global point of view (G)" << endl
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<< "Usage:" << endl
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<< "./transformations [ G | C ]" << endl
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<< endl;
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}
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/**
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* @function cvcloud_load
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* @brief load bunny.ply
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*/
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static Mat cvcloud_load()
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{
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Mat cloud(1, 1889, CV_32FC3);
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ifstream ifs("bunny.ply");
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string str;
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for(size_t i = 0; i < 12; ++i)
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getline(ifs, str);
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Point3f* data = cloud.ptr<cv::Point3f>();
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float dummy1, dummy2;
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for(size_t i = 0; i < 1889; ++i)
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ifs >> data[i].x >> data[i].y >> data[i].z >> dummy1 >> dummy2;
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cloud *= 5.0f;
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return cloud;
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}
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/**
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* @function main
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*/
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int main(int argn, char **argv)
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{
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help();
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if (argn < 2)
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{
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cout << "Missing arguments." << endl;
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return 1;
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}
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bool camera_pov = (argv[1][0] == 'C');
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/// Create a window
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viz::Viz3d myWindow("Coordinate Frame");
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/// Add coordinate axes
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myWindow.showWidget("Coordinate Widget", viz::WCoordinateSystem());
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/// Let's assume camera has the following properties
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Vec3f cam_pos(3.0f,3.0f,3.0f), cam_focal_point(3.0f,3.0f,2.0f), cam_y_dir(-1.0f,0.0f,0.0f);
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/// We can get the pose of the cam using makeCameraPose
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Affine3f cam_pose = viz::makeCameraPose(cam_pos, cam_focal_point, cam_y_dir);
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/// We can get the transformation matrix from camera coordinate system to global using
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/// - makeTransformToGlobal. We need the axes of the camera
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Affine3f transform = viz::makeTransformToGlobal(Vec3f(0.0f,-1.0f,0.0f), Vec3f(-1.0f,0.0f,0.0f), Vec3f(0.0f,0.0f,-1.0f), cam_pos);
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/// Create a cloud widget.
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Mat bunny_cloud = cvcloud_load();
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viz::WCloud cloud_widget(bunny_cloud, viz::Color::green());
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/// Pose of the widget in camera frame
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Affine3f cloud_pose = Affine3f().translate(Vec3f(0.0f,0.0f,3.0f));
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/// Pose of the widget in global frame
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Affine3f cloud_pose_global = transform * cloud_pose;
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/// Visualize camera frame
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if (!camera_pov)
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{
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viz::WCameraPosition cpw(0.5); // Coordinate axes
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viz::WCameraPosition cpw_frustum(Vec2f(0.889484, 0.523599)); // Camera frustum
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myWindow.showWidget("CPW", cpw, cam_pose);
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myWindow.showWidget("CPW_FRUSTUM", cpw_frustum, cam_pose);
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}
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/// Visualize widget
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myWindow.showWidget("bunny", cloud_widget, cloud_pose_global);
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/// Set the viewer pose to that of camera
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if (camera_pov)
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myWindow.setViewerPose(cam_pose);
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/// Start event loop.
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myWindow.spin();
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return 0;
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}
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