mirrors/opencv_contrib
1
0
Fork 0
Code Pull Requests Packages Releases Activity

vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

Browse Source
This commit is contained in:
Gitea Mirror Bot
2026-08-22 00:11:13 +08:00
commit 12022378a3
3872 changed files with 2513409 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
modules/ximgproc/samples/fourier_descriptors_demo.cpp
+187
View File
@@ -0,0 +1,187 @@
#include <opencv2/core.hpp>
#include <opencv2/core/utility.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/geometry.hpp>
#include <opencv2/ximgproc.hpp>
#include <iostream>
using namespace cv;
using namespace std;
struct ThParameters {
int levelNoise;
int angle;
int scale10;
int origin;
int xg;
int yg;
bool update;
} ;
static vector<Point> NoisyPolygon(vector<Point> pRef, double n);
static void UpdateShape(int , void *r);
static void AddSlider(String sliderName, String windowName, int minSlider, int maxSlider, int valDefault, int *valSlider, void(*f)(int, void *), void *r);
int main(void)
{
vector<Point> ctrRef;
vector<Point> ctrRotate, ctrNoisy, ctrNoisyRotate, ctrNoisyRotateShift;
// build a shape with 5 vertex
ctrRef.push_back(Point(250,250)); ctrRef.push_back(Point(400, 250));
ctrRef.push_back(Point(400, 300)); ctrRef.push_back(Point(250, 300));ctrRef.push_back(Point(180, 270));
Point cg(0,0);
for (int i=0;i<static_cast<int>(ctrRef.size());i++)
cg+=ctrRef[i];
cg.x /= static_cast<int>(ctrRef.size());
cg.y /= static_cast<int>(ctrRef.size());
ThParameters p;
p.levelNoise=6;
p.angle=45;
p.scale10=5;
p.origin=10;
p.xg=150;
p.yg=150;
p.update=true;
namedWindow("FD Curve matching");
// A rotation with center at (150,150) of angle 45 degrees and a scaling of 5/10
AddSlider("Noise", "FD Curve matching", 0, 20, p.levelNoise, &p.levelNoise, UpdateShape, &p);
AddSlider("Angle", "FD Curve matching", 0, 359, p.angle, &p.angle, UpdateShape, &p);
AddSlider("Scale", "FD Curve matching", 5, 100, p.scale10, &p.scale10, UpdateShape, &p);
AddSlider("Origin%%", "FD Curve matching", 0, 100, p.origin, &p.origin, UpdateShape, &p);
AddSlider("Xg", "FD Curve matching", 150, 450, p.xg, &p.xg, UpdateShape, &p);
AddSlider("Yg", "FD Curve matching", 150, 450, p.yg, &p.yg, UpdateShape, &p);
int code=0;
double dist;
vector<vector<Point> > c;
Mat img;
cout << "******************** PRESS g TO MATCH CURVES *************\n";
do
{
code = waitKey(30);
if (p.update)
{
Mat r = getRotationMatrix2D(Point(p.xg, p.yg), p.angle, 10.0/ p.scale10);
ctrNoisy= NoisyPolygon(ctrRef,static_cast<double>(p.levelNoise));
cv::transform(ctrNoisy, ctrNoisyRotate, r);
ctrNoisyRotateShift.clear();
for (int i=0;i<static_cast<int>(ctrNoisy.size());i++)
ctrNoisyRotateShift.push_back(ctrNoisyRotate[(i+(p.origin*ctrNoisy.size())/100)% ctrNoisy.size()]);
// To draw contour using drawcontours
c.clear();
c.push_back(ctrRef);
c.push_back(ctrNoisyRotateShift);
p.update = false;
Rect rglobal;
for (int i = 0; i < static_cast<int>(c.size()); i++)
{
rglobal = boundingRect(c[i]) | rglobal;
}
rglobal.width += 10;
rglobal.height += 10;
img = Mat::zeros(2 * rglobal.height, 2 * rglobal.width, CV_8UC(3));
drawContours(img, c, 0, Scalar(255,0,0));
drawContours(img, c, 1, Scalar(0, 255, 0));
circle(img, c[0][0], 5, Scalar(255, 0, 0));
circle(img, c[1][0], 5, Scalar(0, 255, 0));
imshow("FD Curve matching", img);
}
if (code == 'd')
{
destroyWindow("FD Curve matching");
namedWindow("FD Curve matching");
// A rotation with center at (150,150) of angle 45 degrees and a scaling of 5/10
AddSlider("Noise", "FD Curve matching", 0, 20, p.levelNoise, &p.levelNoise, UpdateShape, &p);
AddSlider("Angle", "FD Curve matching", 0, 359, p.angle, &p.angle, UpdateShape, &p);
AddSlider("Scale", "FD Curve matching", 5, 100, p.scale10, &p.scale10, UpdateShape, &p);
AddSlider("Origin%%", "FD Curve matching", 0, 100, p.origin, &p.origin, UpdateShape, &p);
AddSlider("Xg", "FD Curve matching", 150, 450, p.xg, &p.xg, UpdateShape, &p);
AddSlider("Yg", "FD Curve matching", 150, 450, p.yg, &p.yg, UpdateShape, &p);
}
if (code == 'g')
{
ximgproc::ContourFitting fit;
vector<Point2f> ctrRef2d, ctrRot2d;
// sampling contour we want 256 points
ximgproc::contourSampling(ctrRef, ctrRef2d, 256); // use a mat
ximgproc::contourSampling(ctrNoisyRotateShift, ctrRot2d, 256); // use a vector of points
fit.setFDSize(16);
Mat t;
fit.estimateTransformation(ctrRot2d, ctrRef2d, t, &dist, false);
cout << "Transform *********\n "<<"Origin = "<< 1-t.at<double>(0,0) <<" expected "<< p.origin/100.0 <<" ("<< ctrNoisy.size()<<")\n";
cout << "Angle = " << t.at<double>(0, 1) * 180 / M_PI << " expected " << p.angle <<"\n";
cout << "Scale = " << t.at<double>(0, 2) << " expected " << p.scale10 / 10.0 << "\n";
Mat dst;
ximgproc::transformFD(ctrRot2d, t, dst, false);
c.push_back(dst);
drawContours(img, c, 2, Scalar(0,255,255));
circle(img, c[2][0], 5, Scalar(0, 255, 255));
imshow("FD Curve matching", img);
}
}
while (code!=27);
return 0;
}
vector<Point> NoisyPolygon(vector<Point> pRef, double n)
{
RNG rng;
vector<Point> c;
vector<Point> p = pRef;
vector<vector<Point> > contour;
for (int i = 0; i<static_cast<int>(p.size()); i++)
p[i] += Point(Point2d(n*rng.uniform((double)-1, (double)1), n*rng.uniform((double)-1, (double)1)));
if (n==0)
return p;
c.push_back(p[0]);
int minX = p[0].x, maxX = p[0].x, minY = p[0].y, maxY = p[0].y;
for (int i = 0; i <static_cast<int>(p.size()); i++)
{
int next = i + 1;
if (next == static_cast<int>(p.size()))
next = 0;
Point2d u = p[next] - p[i];
int d = static_cast<int>(norm(u));
double a = atan2(u.y, u.x);
int step = 1;
if (n != 0)
step = static_cast<int>(d / n);
for (int j = 1; j<d; j += max(step, 1))
{
Point pNew;
do
{
Point2d pAct = (u*j) / static_cast<double>(d);
double r = n*rng.uniform((double)0, (double)1);
double theta = a + rng.uniform(0., 2 * CV_PI);
pNew = Point(Point2d(r*cos(theta) + pAct.x + p[i].x, r*sin(theta) + pAct.y + p[i].y));
} while (pNew.x<0 || pNew.y<0);
if (pNew.x<minX)
minX = pNew.x;
if (pNew.x>maxX)
maxX = pNew.x;
if (pNew.y<minY)
minY = pNew.y;
if (pNew.y>maxY)
maxY = pNew.y;
c.push_back(pNew);
}
}
return c;
}
void UpdateShape(int , void *r)
{
((ThParameters *)r)->update = true;
}
void AddSlider(String sliderName, String windowName, int minSlider, int maxSlider, int valDefault, int *valSlider, void(*f)(int, void *), void *r)
{
createTrackbar(sliderName, windowName, valSlider, 1, f, r);
setTrackbarMin(sliderName, windowName, minSlider);
setTrackbarMax(sliderName, windowName, maxSlider);
setTrackbarPos(sliderName, windowName, valDefault);
}