opencv/modules/calib3d/test/test_affine3d_estimator.cpp

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#include "test_precomp.hpp"

using namespace cv;
using namespace std;

#include <string>
#include <iostream>
#include <fstream>
#include <functional>
#include <iterator>
#include <limits>
#include <numeric>

class CV_Affine3D_EstTest : public cvtest::BaseTest
{
public:
    CV_Affine3D_EstTest();
    ~CV_Affine3D_EstTest();    
protected:
    void run(int);    

    bool test4Points();
    bool testNPoints();
};

CV_Affine3D_EstTest::CV_Affine3D_EstTest()
{
}
CV_Affine3D_EstTest::~CV_Affine3D_EstTest() {}


float rngIn(float from, float to) { return from + (to-from) * (float)theRNG(); }


struct WrapAff
{
    const double *F;
    WrapAff(const Mat& aff) : F(aff.ptr<double>()) {}
    Point3f operator()(const Point3f& p)
    {
        return Point3d( p.x * F[0] + p.y * F[1] + p.z *  F[2] +  F[3],
                        p.x * F[4] + p.y * F[5] + p.z *  F[6] +  F[7],
                        p.x * F[8] + p.y * F[9] + p.z * F[10] + F[11]  );      
    }
};

bool CV_Affine3D_EstTest::test4Points()
{   
    Mat aff(3, 4, CV_64F);
    cv::randu(aff, Scalar(1), Scalar(3));
      
    // setting points that are no in the same line

    Mat fpts(1, 4, CV_32FC3);
    Mat tpts(1, 4, CV_32FC3);
        
    fpts.ptr<Point3f>()[0] = Point3f( rngIn(1,2), rngIn(1,2), rngIn(5, 6) );
    fpts.ptr<Point3f>()[1] = Point3f( rngIn(3,4), rngIn(3,4), rngIn(5, 6) );
    fpts.ptr<Point3f>()[2] = Point3f( rngIn(1,2), rngIn(3,4), rngIn(5, 6) );
    fpts.ptr<Point3f>()[3] = Point3f( rngIn(3,4), rngIn(1,2), rngIn(5, 6) );
       
    transform(fpts.ptr<Point3f>(), fpts.ptr<Point3f>() + 4, tpts.ptr<Point3f>(), WrapAff(aff));

    Mat aff_est;
    vector<uchar> outliers;
    estimateAffine3D(fpts, tpts, aff_est, outliers);

    const double thres = 1e-3;
    if (norm(aff_est, aff, NORM_INF) > thres)
    {
        //cout << norm(aff_est, aff, NORM_INF) << endl;
        ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
        return false;
    }    
    return true;
}

struct Noise
{
    float l;
    Noise(float level) : l(level) {}
    Point3f operator()(const Point3f& p)
    {
        RNG& rng = theRNG();        
        return Point3f( p.x + l * (float)rng,  p.y + l * (float)rng,  p.z + l * (float)rng);                 
    }
};

bool CV_Affine3D_EstTest::testNPoints()
{       
    Mat aff(3, 4, CV_64F);
    cv::randu(aff, Scalar(-2), Scalar(2));
      
    // setting points that are no in the same line
    
    const int n = 100;
    const int m = 3*n/5;
    const Point3f shift_outl = Point3f(15, 15, 15);
    const float noise_level = 20.f;
    
    Mat fpts(1, n, CV_32FC3);
    Mat tpts(1, n, CV_32FC3);
   
    randu(fpts, Scalar::all(0), Scalar::all(100));           
    transform(fpts.ptr<Point3f>(), fpts.ptr<Point3f>() + n, tpts.ptr<Point3f>(), WrapAff(aff));

    /* adding noise*/
    transform(tpts.ptr<Point3f>() + m, tpts.ptr<Point3f>() + n, tpts.ptr<Point3f>() + m, bind2nd(plus<Point3f>(), shift_outl));
    transform(tpts.ptr<Point3f>() + m, tpts.ptr<Point3f>() + n, tpts.ptr<Point3f>() + m, Noise(noise_level));
    
    Mat aff_est;
    vector<uchar> outl;
    int res = estimateAffine3D(fpts, tpts, aff_est, outl);

    if (!res)
    {     
        ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
        return false;
    }

    const double thres = 1e-4;
    if (norm(aff_est, aff, NORM_INF) > thres)
    {        
        ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
        return false;
    }    

    bool outl_good = count(outl.begin(), outl.end(), 1) == m && 
        m == accumulate(outl.begin(), outl.begin() + m, 0);

    if (!outl_good)
    {
        ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
        return false;
    }
    return true;
}


void CV_Affine3D_EstTest::run( int /* start_from */)
{	
    cvtest::DefaultRngAuto dra;
    
    if (!test4Points())
        return;

    if (!testNPoints())
        return;

    ts->set_failed_test_info(cvtest::TS::OK);
}

TEST(Calib3d_EstimateAffineTransform, accuracy) { CV_Affine3D_EstTest test; test.safe_run(); }