vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#include "precomp.hpp"
namespace cv
{
namespace rapid
{
static std::vector<int> getSilhoutteVertices(const Size& imsize, const std::vector<Point>& contour,
const Mat_<Point2f>& pts2d)
{
// store indices
Mat_<int> img1(imsize, 0);
Rect img_rect({0, 0}, imsize);
for (int i = 0; i < pts2d.rows; i++) {
// Workaround for https://github.com/opencv/opencv/issues/26016
// To keep its behaviour, pts2d casts to Point_<int>.
if (img_rect.contains(Point_<int>(pts2d(i)))) {
img1(pts2d(i)) = i + 1;
}
}
std::vector<int> v_idx;
// look up indices on contour
for (size_t i = 0; i < contour.size(); i++) {
if (int idx = img1(contour[i])) {
v_idx.push_back(idx - 1);
}
}
return v_idx;
}
class Contour3DSampler {
std::vector<int> idx; // indices of points on contour
std::vector<float> cum_dist; // prefix sum
Mat_<Point2f> ipts2d;
Mat_<Point3f> ipts3d;
float lambda;
int pos;
public:
float perimeter;
Contour3DSampler(const Mat_<Point2f>& pts2d, const Mat_<Point3f>& pts3d,
const std::vector<Point>& contour, const Size& imsize)
: ipts2d(pts2d), ipts3d(pts3d)
{
idx = getSilhoutteVertices(imsize, contour, pts2d);
CV_Assert(!idx.empty());
// close the loop
idx.push_back(idx[0]);
cum_dist.resize(idx.size());
perimeter = 0.0f;
for (size_t i = 1; i < idx.size(); i++) {
perimeter += (float)norm(pts2d(idx[i]) - pts2d(idx[i - 1]));
cum_dist[i] = perimeter;
}
pos = 0;
lambda = 0;
}
void advanceTo(float dist)
{
while (pos < int(cum_dist.size() - 1) && dist >= cum_dist[pos]) {
pos++;
}
lambda = (dist - cum_dist[pos - 1]) / (cum_dist[pos] - cum_dist[pos - 1]);
}
Point3f current3D() const { return (1 - lambda) * ipts3d(idx[pos - 1]) + lambda * ipts3d(idx[pos]); }
Point2f current2D() const { return (1 - lambda) * ipts2d(idx[pos - 1]) + lambda * ipts2d(idx[pos]); }
};
void drawWireframe(InputOutputArray img, InputArray _pts2d, InputArray _tris,
const Scalar& color, int type, bool cullBackface)
{
CV_Assert(_tris.getMat().checkVector(3, CV_32S) > 0);
CV_Assert(_pts2d.getMat().checkVector(2, CV_32F) > 0);
Mat_<Vec3i> tris = _tris.getMat();
Mat_<Point2f> pts2d = _pts2d.getMat();
for (int i = 0; i < int(tris.total()); i++) {
const auto& idx = tris(i);
std::vector<Point> poly = {pts2d(idx[0]), pts2d(idx[1]), pts2d(idx[2])};
// skip back facing triangles
if (cullBackface && ((poly[2] - poly[0]).cross(poly[2] - poly[1]) >= 0))
continue;
polylines(img, poly, true, color, 1, type);
}
}
void drawSearchLines(InputOutputArray img, InputArray _locations, const Scalar& color)
{
Mat locations = _locations.getMat();
CV_CheckTypeEQ(_locations.type(), CV_16SC2, "Vec2s data type expected");
for (int i = 0; i < locations.rows; i++) {
Point pt1(locations.at<Vec2s>(i, 0));
Point pt2(locations.at<Vec2s>(i, locations.cols - 1));
line(img, pt1, pt2, color, 1);
}
}
static void sampleControlPoints(int num, Contour3DSampler& sampler, const Rect& roi, OutputArray _opts2d,
OutputArray _opts3d)
{
std::vector<Vec3f> opts3d;
opts3d.reserve(num);
std::vector<Vec2f> opts2d;
opts2d.reserve(num);
// sample at equal steps
float step = sampler.perimeter / num;
if (step == 0)
num = 0; // edge case -> skip loop
for (int i = 0; i < num; i++) {
sampler.advanceTo(step * i);
auto pt2d = sampler.current2D();
// skip points too close to border
//
// Workaround for https://github.com/opencv/opencv/issues/26016
// To keep its behaviour, pt2d casts to Point_<int>.
if (!roi.contains(Point_<int>(pt2d)))
continue;
opts3d.push_back(sampler.current3D());
opts2d.push_back(pt2d);
}
Mat(opts3d).copyTo(_opts3d);
Mat(opts2d).copyTo(_opts2d);
}
void extractControlPoints(int num, int len, InputArray pts3d, InputArray rvec, InputArray tvec,
InputArray K, const Size& imsize, InputArray tris, OutputArray ctl2d,
OutputArray ctl3d)
{
CV_Assert(num);
Mat_<Point2f> pts2d(pts3d.rows(), 1);
projectPoints(pts3d, rvec, tvec, K, noArray(), pts2d);
Mat_<uchar> img(imsize, uchar(0));
drawWireframe(img, pts2d, tris.getMat(), 255, LINE_8, true);
// find contour
std::vector<std::vector<Point>> contours;
findContours(img, contours, RETR_EXTERNAL, CHAIN_APPROX_NONE);
CV_Assert(!contours.empty());
Contour3DSampler sampler(pts2d, pts3d.getMat(), contours[0], imsize);
Rect valid_roi(Point(len, len), imsize - Size(2 * len, 2 * len));
sampleControlPoints(num, sampler, valid_roi, ctl2d, ctl3d);
}
void extractLineBundle(int len, InputArray ctl2d, InputArray img, OutputArray bundle,
OutputArray srcLocations)
{
CV_Assert(len > 0);
Mat _img = img.getMat();
CV_Assert(ctl2d.getMat().checkVector(2, CV_32F) > 0);
Mat_<Point2f> contour = ctl2d.getMat();
const int N = (int)contour.total();
const int W = len * 2 + 1;
srcLocations.create(N, W, CV_16SC2);
Mat_<Vec2s> _srcLocations = srcLocations.getMat();
for (int i = 0; i < N; i++) {
// central difference
const Point2f diff = contour((i + 1) % N) - contour((i - 1 + N) % N);
Point2f n(normalize(Vec2f(-diff.y, diff.x))); // perpendicular to diff
// make it cover L pixels
n *= len / std::max(std::abs(n.x), std::abs(n.y));
LineIterator li(_img, contour(i) - n, contour(i) + n);
CV_DbgAssert(li.count == W);
for (int j = 0; j < li.count; j++, ++li) {
_srcLocations(i, j) = Vec2i(li.pos());
}
}
remap(img, bundle, srcLocations, noArray(),
INTER_NEAREST); // inter_nearest as we use integer locations
}
void compute1DSobel(const Mat& src, Mat& dst)
{
CV_CheckDepthEQ(src.depth(), CV_8U, "only uchar images supported");
int channels = src.channels();
CV_Assert(channels == 1 || channels == 3);
dst.create(src.size(), CV_8U);
for (int i = 0; i < src.rows; i++) {
for (int j = 1; j < src.cols - 1; j++) {
// central difference kernel: [-1, 0, 1]
if (channels == 3) {
const Vec3s diff = Vec3s(src.at<Vec3b>(i, j + 1)) - Vec3s(src.at<Vec3b>(i, j - 1));
dst.at<uchar>(i, j) =
(uchar)std::max(std::max(std::abs(diff[0]), std::abs(diff[1])), std::abs(diff[2]));
} else {
dst.at<uchar>(i, j) = (uchar)std::abs(src.at<uchar>(i, j + 1) - src.at<uchar>(i, j - 1));
}
}
dst.at<uchar>(i, 0) = dst.at<uchar>(i, src.cols - 1) = 0; // border
}
}
void findCorrespondencies(InputArray bundle, OutputArray _cols, OutputArray _response)
{
Mat_<uchar> sobel;
compute1DSobel(bundle.getMat(), sobel);
_cols.create(sobel.rows, 1, CV_32S);
Mat_<int> cols = _cols.getMat();
Mat_<uchar> response;
if (_response.needed()) {
_response.create(sobel.rows, 1, CV_8U);
response = _response.getMat();
}
// sobel.cols = 2*len + 1
const int len = sobel.cols / 2;
const int ct = len + 1;
// find closest maximum to center
for (int i = 0; i < sobel.rows; i++) {
int pos = ct;
uchar mx = sobel.at<uchar>(i, ct);
for (int j = 0; j < len; j++) {
uchar right = sobel.at<uchar>(i, ct + j);
uchar left = sobel.at<uchar>(i, ct - j);
if (right > mx) {
mx = right;
pos = ct + j;
}
if (left > mx) {
mx = left;
pos = ct - j;
}
}
if (!response.empty())
response(i) = mx;
cols(i) = pos;
}
}
void drawCorrespondencies(InputOutputArray _bundle, InputArray _cols, InputArray _colors)
{
CV_CheckTypeEQ(_cols.type(), CV_32S, "cols must be of int type");
CV_Assert(_bundle.rows() == _cols.rows());
CV_Assert(_colors.empty() || _colors.rows() == _cols.rows());
Mat bundle = _bundle.getMat();
Mat_<int> cols = _cols.getMat();
Mat_<Vec4d> colors = _colors.getMat();
for (int i = 0; i < bundle.rows; i++) {
bundle(Rect(Point(cols(i), i), Size(1, 1))) = colors.empty() ? Scalar::all(255) : colors(i);
}
}
void convertCorrespondencies(InputArray _cols, InputArray _srcLocations, OutputArray _pts2d,
InputOutputArray _pts3d, InputArray _mask)
{
CV_CheckTypeEQ(_cols.type(), CV_32S, "cols must be of int type");
CV_CheckTypeEQ(_srcLocations.type(), CV_16SC2, "Vec2s data type expected");
CV_Assert(_srcLocations.rows() == _cols.rows());
Mat_<cv::Vec2s> srcLocations = _srcLocations.getMat();
Mat_<int> cols = _cols.getMat();
Mat pts2d = Mat(0, 1, CV_16SC2);
pts2d.reserve(cols.rows);
Mat_<uchar> mask;
if (!_mask.empty())
{
CV_CheckTypeEQ(_mask.type(), CV_8UC1, "mask must be of uchar type");
CV_Assert(_cols.rows() == _mask.rows());
mask = _mask.getMat();
}
Mat pts3d;
Mat opts3d;
if(!_pts3d.empty())
{
pts3d = _pts3d.getMat().t();
CV_Assert(cols.rows == pts3d.rows);
opts3d.create(0, 1, pts3d.type());
opts3d.reserve(cols.rows);
}
for (int i = 0; i < cols.rows; i++) {
if (!mask.empty() && !mask(i))
continue;
pts2d.push_back(srcLocations(i, cols(i)));
if(!pts3d.empty())
opts3d.push_back(pts3d.row(i));
}
pts2d.copyTo(_pts2d);
if(!pts3d.empty())
opts3d.copyTo(_pts3d);
}
float rapid(InputArray img, int num, int len, InputArray vtx, InputArray tris, InputArray K,
InputOutputArray rvec, InputOutputArray tvec, double* rmsd)
{
CV_Assert(num >= 3);
Mat pts2d, pts3d;
extractControlPoints(num, len, vtx, rvec, tvec, K, img.size(), tris, pts2d, pts3d);
if (pts2d.empty())
return 0;
Mat lineBundle, imgLoc;
extractLineBundle(len, pts2d, img, lineBundle, imgLoc);
Mat cols, response;
findCorrespondencies(lineBundle, cols, response);
const uchar sobel_thresh = 20;
Mat mask = response > sobel_thresh;
convertCorrespondencies(cols, imgLoc, pts2d, pts3d, mask);
if(rmsd)
{
cols.copyTo(cols, mask);
cols -= len + 1;
*rmsd = std::sqrt(norm(cols, NORM_L2SQR) / cols.rows);
}
if (pts2d.rows < 3)
return 0;
solvePnPRefineLM(pts3d, pts2d, K, cv::noArray(), rvec, tvec);
return float(pts2d.rows) / num;
}
Tracker::~Tracker() {}
struct RapidImpl : public Rapid
{
Mat pts3d;
Mat tris;
RapidImpl(InputArray _pts3d, InputArray _tris)
{
CV_Assert(_tris.getMat().checkVector(3, CV_32S) > 0);
CV_Assert(_pts3d.getMat().checkVector(3, CV_32F) > 0);
pts3d = _pts3d.getMat();
tris = _tris.getMat();
}
float compute(InputArray img, int num, int len, InputArray K, InputOutputArray rvec,
InputOutputArray tvec, const TermCriteria& termcrit) CV_OVERRIDE
{
float ret = 0;
int niter = std::max(1, termcrit.maxCount);
double rmsd;
Mat cols;
for(int i = 0; i < niter; i++)
{
ret = rapid(img, num, len, pts3d, tris, K, rvec, tvec,
termcrit.type & TermCriteria::EPS ? &rmsd : NULL);
if((termcrit.type & TermCriteria::EPS) && rmsd < termcrit.epsilon)
{
break;
}
}
return ret;
}
void clearState() CV_OVERRIDE
{
// nothing to do
}
};
Ptr<Rapid> Rapid::create(InputArray pts3d, InputArray tris)
{
return makePtr<RapidImpl>(pts3d, tris);
}
} /* namespace rapid */
} /* namespace cv */