opencv/modules/stitching/motion_estimators.cpp
2011-05-04 11:09:42 +00:00

756 lines
25 KiB
C++

#include <algorithm>
#include <functional>
#include <opencv2/calib3d/calib3d.hpp>
#include <opencv2/gpu/gpu.hpp>
#include "focal_estimators.hpp"
#include "motion_estimators.hpp"
#include "util.hpp"
using namespace std;
using namespace cv;
using namespace cv::gpu;
//////////////////////////////////////////////////////////////////////////////
namespace
{
class CpuSurfFeaturesFinder : public FeaturesFinder
{
public:
inline CpuSurfFeaturesFinder()
{
detector_ = new SurfFeatureDetector(500.0);
extractor_ = new SurfDescriptorExtractor;
}
protected:
void find(const vector<Mat> &images, vector<ImageFeatures> &features);
private:
Ptr<FeatureDetector> detector_;
Ptr<DescriptorExtractor> extractor_;
};
void CpuSurfFeaturesFinder::find(const vector<Mat> &images, vector<ImageFeatures> &features)
{
// Make images gray
vector<Mat> gray_images(images.size());
for (size_t i = 0; i < images.size(); ++i)
{
CV_Assert(images[i].depth() == CV_8U);
cvtColor(images[i], gray_images[i], CV_BGR2GRAY);
}
features.resize(images.size());
// Find keypoints in all images
for (size_t i = 0; i < images.size(); ++i)
{
detector_->detect(gray_images[i], features[i].keypoints);
extractor_->compute(gray_images[i], features[i].keypoints, features[i].descriptors);
}
}
class GpuSurfFeaturesFinder : public FeaturesFinder
{
public:
inline GpuSurfFeaturesFinder()
{
surf.hessianThreshold = 500.0;
surf.extended = false;
}
protected:
void find(const vector<Mat> &images, vector<ImageFeatures> &features);
private:
SURF_GPU surf;
};
void GpuSurfFeaturesFinder::find(const vector<Mat> &images, vector<ImageFeatures> &features)
{
// Make images gray
vector<GpuMat> gray_images(images.size());
for (size_t i = 0; i < images.size(); ++i)
{
CV_Assert(images[i].depth() == CV_8U);
cvtColor(GpuMat(images[i]), gray_images[i], CV_BGR2GRAY);
}
features.resize(images.size());
// Find keypoints in all images
GpuMat d_keypoints;
GpuMat d_descriptors;
for (size_t i = 0; i < images.size(); ++i)
{
surf.nOctaves = 3;
surf.nOctaveLayers = 4;
surf(gray_images[i], GpuMat(), d_keypoints);
surf.nOctaves = 4;
surf.nOctaveLayers = 2;
surf(gray_images[i], GpuMat(), d_keypoints, d_descriptors, true);
surf.downloadKeypoints(d_keypoints, features[i].keypoints);
d_descriptors.download(features[i].descriptors);
}
}
}
SurfFeaturesFinder::SurfFeaturesFinder(bool gpu_hint)
{
if (gpu_hint && getCudaEnabledDeviceCount() > 0)
impl_ = new GpuSurfFeaturesFinder;
else
impl_ = new CpuSurfFeaturesFinder;
}
void SurfFeaturesFinder::find(const vector<Mat> &images, vector<ImageFeatures> &features)
{
(*impl_)(images, features);
}
//////////////////////////////////////////////////////////////////////////////
MatchesInfo::MatchesInfo() : src_img_idx(-1), dst_img_idx(-1), num_inliers(0) {}
MatchesInfo::MatchesInfo(const MatchesInfo &other)
{
*this = other;
}
const MatchesInfo& MatchesInfo::operator =(const MatchesInfo &other)
{
src_img_idx = other.src_img_idx;
dst_img_idx = other.dst_img_idx;
matches = other.matches;
num_inliers = other.num_inliers;
H = other.H.clone();
return *this;
}
//////////////////////////////////////////////////////////////////////////////
void FeaturesMatcher::operator ()(const vector<Mat> &images, const vector<ImageFeatures> &features,
vector<MatchesInfo> &pairwise_matches)
{
pairwise_matches.resize(images.size() * images.size());
for (size_t i = 0; i < images.size(); ++i)
{
LOGLN("Processing image " << i << "... ");
for (size_t j = 0; j < images.size(); ++j)
{
if (i == j)
continue;
size_t pair_idx = i * images.size() + j;
(*this)(images[i], features[i], images[j], features[j], pairwise_matches[pair_idx]);
pairwise_matches[pair_idx].src_img_idx = i;
pairwise_matches[pair_idx].dst_img_idx = j;
}
}
}
//////////////////////////////////////////////////////////////////////////////
namespace
{
class CpuMatcher : public FeaturesMatcher
{
public:
inline CpuMatcher(float match_conf) : match_conf_(match_conf) {}
void match(const cv::Mat&, const ImageFeatures &features1, const cv::Mat&, const ImageFeatures &features2, MatchesInfo& matches_info);
private:
float match_conf_;
};
void CpuMatcher::match(const cv::Mat&, const ImageFeatures &features1, const cv::Mat&, const ImageFeatures &features2, MatchesInfo& matches_info)
{
matches_info.matches.clear();
BruteForceMatcher< L2<float> > matcher;
vector< vector<DMatch> > pair_matches;
// Find 1->2 matches
matcher.knnMatch(features1.descriptors, features2.descriptors, pair_matches, 2);
for (size_t i = 0; i < pair_matches.size(); ++i)
{
if (pair_matches[i].size() < 2)
continue;
const DMatch& m0 = pair_matches[i][0];
const DMatch& m1 = pair_matches[i][1];
if (m0.distance < (1.f - match_conf_) * m1.distance)
matches_info.matches.push_back(m0);
}
// Find 2->1 matches
pair_matches.clear();
matcher.knnMatch(features2.descriptors, features1.descriptors, pair_matches, 2);
for (size_t i = 0; i < pair_matches.size(); ++i)
{
if (pair_matches[i].size() < 2)
continue;
const DMatch& m0 = pair_matches[i][0];
const DMatch& m1 = pair_matches[i][1];
if (m0.distance < (1.f - match_conf_) * m1.distance)
matches_info.matches.push_back(DMatch(m0.trainIdx, m0.queryIdx, m0.distance));
}
}
class GpuMatcher : public FeaturesMatcher
{
public:
inline GpuMatcher(float match_conf) : match_conf_(match_conf) {}
void match(const cv::Mat&, const ImageFeatures &features1, const cv::Mat&, const ImageFeatures &features2, MatchesInfo& matches_info);
private:
float match_conf_;
GpuMat descriptors1_;
GpuMat descriptors2_;
GpuMat trainIdx_, distance_, allDist_;
};
void GpuMatcher::match(const cv::Mat&, const ImageFeatures &features1, const cv::Mat&, const ImageFeatures &features2, MatchesInfo& matches_info)
{
matches_info.matches.clear();
BruteForceMatcher_GPU< L2<float> > matcher;
descriptors1_.upload(features1.descriptors);
descriptors2_.upload(features2.descriptors);
vector< vector<DMatch> > pair_matches;
// Find 1->2 matches
matcher.knnMatch(descriptors1_, descriptors2_, trainIdx_, distance_, allDist_, 2);
matcher.knnMatchDownload(trainIdx_, distance_, pair_matches);
for (size_t i = 0; i < pair_matches.size(); ++i)
{
if (pair_matches[i].size() < 2)
continue;
const DMatch& m0 = pair_matches[i][0];
const DMatch& m1 = pair_matches[i][1];
CV_Assert(m0.queryIdx < features1.keypoints.size());
CV_Assert(m0.trainIdx < features2.keypoints.size());
if (m0.distance < (1.f - match_conf_) * m1.distance)
matches_info.matches.push_back(m0);
}
// Find 2->1 matches
pair_matches.clear();
matcher.knnMatch(descriptors2_, descriptors1_, trainIdx_, distance_, allDist_, 2);
matcher.knnMatchDownload(trainIdx_, distance_, pair_matches);
for (size_t i = 0; i < pair_matches.size(); ++i)
{
if (pair_matches[i].size() < 2)
continue;
const DMatch& m0 = pair_matches[i][0];
const DMatch& m1 = pair_matches[i][1];
CV_Assert(m0.trainIdx < features1.keypoints.size());
CV_Assert(m0.queryIdx < features2.keypoints.size());
if (m0.distance < (1.f - match_conf_) * m1.distance)
matches_info.matches.push_back(DMatch(m0.trainIdx, m0.queryIdx, m0.distance));
}
}
}
BestOf2NearestMatcher::BestOf2NearestMatcher(bool gpu_hint, float match_conf, int num_matches_thresh1, int num_matches_thresh2)
{
if (gpu_hint && getCudaEnabledDeviceCount() > 0)
impl_ = new GpuMatcher(match_conf);
else
impl_ = new CpuMatcher(match_conf);
num_matches_thresh1_ = num_matches_thresh1;
num_matches_thresh2_ = num_matches_thresh2;
}
void BestOf2NearestMatcher::match(const Mat &img1, const ImageFeatures &features1, const Mat &img2, const ImageFeatures &features2,
MatchesInfo &matches_info)
{
(*impl_)(img1, features1, img2, features2, matches_info);
// Check if it makes sense to find homography
if (matches_info.matches.size() < static_cast<size_t>(num_matches_thresh1_))
return;
// Construct point-point correspondences for homography estimation
Mat src_points(1, matches_info.matches.size(), CV_32FC2);
Mat dst_points(1, matches_info.matches.size(), CV_32FC2);
for (size_t i = 0; i < matches_info.matches.size(); ++i)
{
const DMatch& m = matches_info.matches[i];
Point2f p = features1.keypoints[m.queryIdx].pt;
p.x -= img1.cols * 0.5f;
p.y -= img1.rows * 0.5f;
src_points.at<Point2f>(0, i) = p;
p = features2.keypoints[m.trainIdx].pt;
p.x -= img2.cols * 0.5f;
p.y -= img2.rows * 0.5f;
dst_points.at<Point2f>(0, i) = p;
}
// Find pair-wise motion
vector<uchar> inlier_mask;
matches_info.H = findHomography(src_points, dst_points, inlier_mask, CV_RANSAC);
// Find number of inliers
matches_info.num_inliers = 0;
for (size_t i = 0; i < inlier_mask.size(); ++i)
if (inlier_mask[i])
matches_info.num_inliers++;
// Check if we should try to refine motion
if (matches_info.num_inliers < num_matches_thresh2_)
return;
// Construct point-point correspondences for inliers only
src_points.create(1, matches_info.num_inliers, CV_32FC2);
dst_points.create(1, matches_info.num_inliers, CV_32FC2);
int inlier_idx = 0;
for (size_t i = 0; i < matches_info.matches.size(); ++i)
{
if (!inlier_mask[i])
continue;
const DMatch& m = matches_info.matches[i];
Point2f p = features1.keypoints[m.queryIdx].pt;
p.x -= img1.cols * 0.5f;
p.y -= img2.rows * 0.5f;
src_points.at<Point2f>(0, inlier_idx) = p;
p = features2.keypoints[m.trainIdx].pt;
p.x -= img2.cols * 0.5f;
p.y -= img2.rows * 0.5f;
dst_points.at<Point2f>(0, inlier_idx) = p;
inlier_idx++;
}
// Rerun motion estimation on inliers only
matches_info.H = findHomography(src_points, dst_points, inlier_mask, CV_RANSAC);
// Find number of inliers
matches_info.num_inliers = 0;
for (size_t i = 0; i < inlier_mask.size(); ++i)
if (inlier_mask[i])
matches_info.num_inliers++;
}
//////////////////////////////////////////////////////////////////////////////
CameraParams::CameraParams() : focal(1), M(Mat::eye(3, 3, CV_64F)), t(Mat::zeros(3, 1, CV_64F)) {}
CameraParams::CameraParams(const CameraParams &other)
{
*this = other;
}
const CameraParams& CameraParams::operator =(const CameraParams &other)
{
focal = other.focal;
M = other.M.clone();
t = other.t.clone();
return *this;
}
//////////////////////////////////////////////////////////////////////////////
struct IncDistance
{
IncDistance(vector<int> &dists) : dists(&dists[0]) {}
void operator ()(const GraphEdge &edge) { dists[edge.to] = dists[edge.from] + 1; }
int* dists;
};
struct CalcRotation
{
CalcRotation(int num_images, const vector<MatchesInfo> &pairwise_matches, vector<CameraParams> &cameras)
: num_images(num_images), pairwise_matches(&pairwise_matches[0]), cameras(&cameras[0]) {}
void operator ()(const GraphEdge &edge)
{
int pair_idx = edge.from * num_images + edge.to;
double f_from = cameras[edge.from].focal;
double f_to = cameras[edge.to].focal;
Mat K_from = Mat::eye(3, 3, CV_64F);
K_from.at<double>(0, 0) = f_from;
K_from.at<double>(1, 1) = f_from;
Mat K_to = Mat::eye(3, 3, CV_64F);
K_to.at<double>(0, 0) = f_to;
K_to.at<double>(1, 1) = f_to;
Mat R = K_from.inv() * pairwise_matches[pair_idx].H.inv() * K_to;
cameras[edge.to].M = cameras[edge.from].M * R;
}
int num_images;
const MatchesInfo* pairwise_matches;
CameraParams* cameras;
};
void HomographyBasedEstimator::estimate(const vector<Mat> &images, const vector<ImageFeatures> &features,
const vector<MatchesInfo> &pairwise_matches, vector<CameraParams> &cameras)
{
const int num_images = static_cast<int>(images.size());
// Find focals from pair-wise homographies
vector<bool> is_focal_estimated(num_images, false);
vector<double> focals;
for (int i = 0; i < num_images; ++i)
{
for (int j = 0; j < num_images; ++j)
{
int pair_idx = i * num_images + j;
if (pairwise_matches[pair_idx].H.empty())
continue;
double f_to, f_from;
bool f_to_ok, f_from_ok;
focalsFromHomography(pairwise_matches[pair_idx].H.inv(), f_to, f_from, f_to_ok, f_from_ok);
if (f_from_ok)
focals.push_back(f_from);
if (f_to_ok)
focals.push_back(f_to);
if (f_from_ok && f_to_ok)
{
is_focal_estimated[i] = true;
is_focal_estimated[j] = true;
}
}
}
is_focals_estimated_ = true;
for (int i = 0; i < num_images; ++i)
is_focals_estimated_ = is_focals_estimated_ && is_focal_estimated[i];
// Find focal medians and use them as true focal length
nth_element(focals.begin(), focals.end(), focals.begin() + focals.size() / 2);
cameras.resize(num_images);
for (int i = 0; i < num_images; ++i)
cameras[i].focal = focals[focals.size() / 2];
// Restore global motion
Graph span_tree;
vector<int> span_tree_centers;
findMaxSpanningTree(num_images, pairwise_matches, span_tree, span_tree_centers);
span_tree.walkBreadthFirst(span_tree_centers[0], CalcRotation(num_images, pairwise_matches, cameras));
}
//////////////////////////////////////////////////////////////////////////////
void BundleAdjuster::estimate(const vector<Mat> &images, const vector<ImageFeatures> &features,
const vector<MatchesInfo> &pairwise_matches, vector<CameraParams> &cameras)
{
num_images_ = static_cast<int>(images.size());
images_ = &images[0];
features_ = &features[0];
pairwise_matches_ = &pairwise_matches[0];
// Prepare focals and rotations
cameras_.create(num_images_ * 4, 1, CV_64F);
SVD svd;
for (int i = 0; i < num_images_; ++i)
{
cameras_.at<double>(i * 4, 0) = cameras[i].focal;
svd(cameras[i].M, SVD::FULL_UV);
Mat R = svd.u * svd.vt;
if (determinant(R) < 0) R *= -1;
Mat rvec;
Rodrigues(R, rvec); CV_Assert(rvec.type() == CV_32F);
cameras_.at<double>(i * 4 + 1, 0) = rvec.at<float>(0, 0);
cameras_.at<double>(i * 4 + 2, 0) = rvec.at<float>(1, 0);
cameras_.at<double>(i * 4 + 3, 0) = rvec.at<float>(2, 0);
}
edges_.clear();
for (int i = 0; i < num_images_ - 1; ++i)
{
for (int j = i + 1; j < num_images_; ++j)
{
int pair_idx = i * num_images_ + j;
const MatchesInfo& mi = pairwise_matches_[pair_idx];
float ni = static_cast<float>(mi.num_inliers);
float nf = static_cast<float>(mi.matches.size());
if (ni / (8.f + 0.3f * nf) > 1.f)
edges_.push_back(make_pair(i, j));
}
}
total_num_matches_ = 0;
for (size_t i = 0; i < edges_.size(); ++i)
total_num_matches_ += static_cast<int>(pairwise_matches[edges_[i].first * num_images_ + edges_[i].second].matches.size());
CvLevMarq solver(num_images_ * 4, total_num_matches_ * 3,
cvTermCriteria(CV_TERMCRIT_EPS + CV_TERMCRIT_ITER, 100, DBL_EPSILON));
CvMat matParams = cameras_;
cvCopy(&matParams, solver.param);
int count = 0;
double last_err = numeric_limits<double>::max();
for(;;)
{
const CvMat* _param = 0;
CvMat* _J = 0;
CvMat* _err = 0;
bool proceed = solver.update( _param, _J, _err );
cvCopy( _param, &matParams );
if( !proceed || !_err )
break;
if( _J )
{
calcJacobian();
CvMat matJ = J_;
cvCopy( &matJ, _J );
}
if (_err)
{
calcError(err_);
//LOGLN("Error: " << sqrt(err_.dot(err_)));
count++;
CvMat matErr = err_;
cvCopy( &matErr, _err );
}
}
LOGLN("BA final error: " << sqrt(err_.dot(err_)));
LOGLN("BA iterations done: " << count);
// Obtain global motion
for (int i = 0; i < num_images_; ++i)
{
cameras[i].focal = cameras_.at<double>(i * 4, 0);
Mat rvec(3, 1, CV_64F);
rvec.at<double>(0, 0) = cameras_.at<double>(i * 4 + 1, 0);
rvec.at<double>(1, 0) = cameras_.at<double>(i * 4 + 2, 0);
rvec.at<double>(2, 0) = cameras_.at<double>(i * 4 + 3, 0);
Rodrigues(rvec, cameras[i].M);
Mat Mf;
cameras[i].M.convertTo(Mf, CV_32F);
cameras[i].M = Mf;
}
// Normalize motion to center image
Graph span_tree;
vector<int> span_tree_centers;
findMaxSpanningTree(num_images_, pairwise_matches, span_tree, span_tree_centers);
Mat R_inv = cameras[span_tree_centers[0]].M.inv();
for (int i = 0; i < num_images_; ++i)
cameras[i].M = R_inv * cameras[i].M;
}
void BundleAdjuster::calcError(Mat &err)
{
err.create(total_num_matches_ * 3, 1, CV_64F);
int match_idx = 0;
for (size_t edge_idx = 0; edge_idx < edges_.size(); ++edge_idx)
{
int i = edges_[edge_idx].first;
int j = edges_[edge_idx].second;
float f1 = static_cast<float>(cameras_.at<double>(i * 4, 0));
float f2 = static_cast<float>(cameras_.at<double>(j * 4, 0));
double R1[9], R2[9];
Mat R1_(3, 3, CV_64F, R1), R2_(3, 3, CV_64F, R2);
Mat rvec(3, 1, CV_64F);
rvec.at<double>(0, 0) = cameras_.at<double>(i * 4 + 1, 0);
rvec.at<double>(1, 0) = cameras_.at<double>(i * 4 + 2, 0);
rvec.at<double>(2, 0) = cameras_.at<double>(i * 4 + 3, 0);
Rodrigues(rvec, R1_); CV_Assert(R1_.type() == CV_64F);
rvec.at<double>(0, 0) = cameras_.at<double>(j * 4 + 1, 0);
rvec.at<double>(1, 0) = cameras_.at<double>(j * 4 + 2, 0);
rvec.at<double>(2, 0) = cameras_.at<double>(j * 4 + 3, 0);
Rodrigues(rvec, R2_); CV_Assert(R2_.type() == CV_64F);
const ImageFeatures& features1 = features_[i];
const ImageFeatures& features2 = features_[j];
const MatchesInfo& matches_info = pairwise_matches_[i * num_images_ + j];
for (size_t k = 0; k < matches_info.matches.size(); ++k)
{
const DMatch& m = matches_info.matches[k];
Point2f kp1 = features1.keypoints[m.queryIdx].pt;
kp1.x -= 0.5f * images_[i].cols;
kp1.y -= 0.5f * images_[i].rows;
Point2f kp2 = features2.keypoints[m.trainIdx].pt;
kp2.x -= 0.5f * images_[j].cols;
kp2.y -= 0.5f * images_[j].rows;
float len1 = sqrt(kp1.x * kp1.x + kp1.y * kp1.y + f1 * f1);
float len2 = sqrt(kp2.x * kp2.x + kp2.y * kp2.y + f2 * f2);
Point3f p1(kp1.x / len1, kp1.y / len1, f1 / len1);
Point3f p2(kp2.x / len2, kp2.y / len2, f2 / len2);
Point3f d1(p1.x * R1[0] + p1.y * R1[1] + p1.z * R1[2],
p1.x * R1[3] + p1.y * R1[4] + p1.z * R1[5],
p1.x * R1[6] + p1.y * R1[7] + p1.z * R1[8]);
Point3f d2(p2.x * R2[0] + p2.y * R2[1] + p2.z * R2[2],
p2.x * R2[3] + p2.y * R2[4] + p2.z * R2[5],
p2.x * R2[6] + p2.y * R2[7] + p2.z * R2[8]);
float mult = 1.f;
if (cost_space_ == FOCAL_RAY_SPACE)
mult = sqrt(f1 * f2);
err.at<double>(3 * match_idx, 0) = mult * (d1.x - d2.x);
err.at<double>(3 * match_idx + 1, 0) = mult * (d1.y - d2.y);
err.at<double>(3 * match_idx + 2, 0) = mult * (d1.z - d2.z);
match_idx++;
}
}
}
void calcDeriv(const Mat &err1, const Mat &err2, double h, Mat res)
{
for (int i = 0; i < err1.rows; ++i)
res.at<double>(i, 0) = (err2.at<double>(i, 0) - err1.at<double>(i, 0)) / h;
}
void BundleAdjuster::calcJacobian()
{
J_.create(total_num_matches_ * 3, num_images_ * 4, CV_64F);
double f, r;
const double df = 0.001; // Focal length step
const double dr = 0.001; // Angle step
for (int i = 0; i < num_images_; ++i)
{
f = cameras_.at<double>(i * 4, 0);
cameras_.at<double>(i * 4, 0) = f - df;
calcError(err1_);
cameras_.at<double>(i * 4, 0) = f + df;
calcError(err2_);
calcDeriv(err1_, err2_, 2 * df, J_.col(i * 4));
cameras_.at<double>(i * 4, 0) = f;
r = cameras_.at<double>(i * 4 + 1, 0);
cameras_.at<double>(i * 4 + 1, 0) = r - dr;
calcError(err1_);
cameras_.at<double>(i * 4 + 1, 0) = r + dr;
calcError(err2_);
calcDeriv(err1_, err2_, 2 * dr, J_.col(i * 4 + 1));
cameras_.at<double>(i * 4 + 1, 0) = r;
r = cameras_.at<double>(i * 4 + 2, 0);
cameras_.at<double>(i * 4 + 2, 0) = r - dr;
calcError(err1_);
cameras_.at<double>(i * 4 + 2, 0) = r + dr;
calcError(err2_);
calcDeriv(err1_, err2_, 2 * dr, J_.col(i * 4 + 2));
cameras_.at<double>(i * 4 + 2, 0) = r;
r = cameras_.at<double>(i * 4 + 3, 0);
cameras_.at<double>(i * 4 + 3, 0) = r - dr;
calcError(err1_);
cameras_.at<double>(i * 4 + 3, 0) = r + dr;
calcError(err2_);
calcDeriv(err1_, err2_, 2 * dr, J_.col(i * 4 + 3));
cameras_.at<double>(i * 4 + 3, 0) = r;
}
}
//////////////////////////////////////////////////////////////////////////////
void findMaxSpanningTree(int num_images, const vector<MatchesInfo> &pairwise_matches,
Graph &span_tree, vector<int> &centers)
{
Graph graph(num_images);
vector<GraphEdge> edges;
// Construct images graph and remember its edges
for (int i = 0; i < num_images; ++i)
{
for (int j = 0; j < num_images; ++j)
{
float conf = static_cast<float>(pairwise_matches[i * num_images + j].num_inliers);
graph.addEdge(i, j, conf);
edges.push_back(GraphEdge(i, j, conf));
}
}
DjSets comps(num_images);
span_tree.create(num_images);
vector<int> span_tree_powers(num_images, 0);
// Find maximum spanning tree
sort(edges.begin(), edges.end(), greater<GraphEdge>());
for (size_t i = 0; i < edges.size(); ++i)
{
int comp1 = comps.find(edges[i].from);
int comp2 = comps.find(edges[i].to);
if (comp1 != comp2)
{
comps.merge(comp1, comp2);
span_tree.addEdge(edges[i].from, edges[i].to, edges[i].weight);
span_tree.addEdge(edges[i].to, edges[i].from, edges[i].weight);
span_tree_powers[edges[i].from]++;
span_tree_powers[edges[i].to]++;
}
}
// Find spanning tree leafs
vector<int> span_tree_leafs;
for (int i = 0; i < num_images; ++i)
if (span_tree_powers[i] == 1)
span_tree_leafs.push_back(i);
// Find maximum distance from each spanning tree vertex
vector<int> max_dists(num_images, 0);
vector<int> cur_dists;
for (size_t i = 0; i < span_tree_leafs.size(); ++i)
{
cur_dists.assign(num_images, 0);
span_tree.walkBreadthFirst(span_tree_leafs[i], IncDistance(cur_dists));
for (int j = 0; j < num_images; ++j)
max_dists[j] = max(max_dists[j], cur_dists[j]);
}
// Find min-max distance
int min_max_dist = max_dists[0];
for (int i = 1; i < num_images; ++i)
if (min_max_dist > max_dists[i])
min_max_dist = max_dists[i];
// Find spanning tree centers
centers.clear();
for (int i = 0; i < num_images; ++i)
if (max_dists[i] == min_max_dist)
centers.push_back(i);
CV_Assert(centers.size() > 0 && centers.size() <= 2);
}