opencv/modules/imgproc/src/matchcontours.cpp

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#include "precomp.hpp"


double cv::matchShapes(InputArray contour1, InputArray contour2, int method, double)
{
    CV_INSTRUMENT_REGION();

    double ma[7], mb[7];
    int i, sma, smb;
    double eps = 1.e-5;
    double mmm;
    double result = 0;
    bool anyA = false, anyB = false;

    HuMoments( moments(contour1), ma );
    HuMoments( moments(contour2), mb );

    switch (method)
    {
    case 1:
        for( i = 0; i < 7; i++ )
        {
            double ama = fabs( ma[i] );
            double amb = fabs( mb[i] );

            if (ama > 0)
                anyA = true;
            if (amb > 0)
                anyB = true;

            if( ma[i] > 0 )
                sma = 1;
            else if( ma[i] < 0 )
                sma = -1;
            else
                sma = 0;
            if( mb[i] > 0 )
                smb = 1;
            else if( mb[i] < 0 )
                smb = -1;
            else
                smb = 0;

            if( ama > eps && amb > eps )
            {
                ama = 1. / (sma * log10( ama ));
                amb = 1. / (smb * log10( amb ));
                result += fabs( -ama + amb );
            }
        }
        break;

    case 2:
        for( i = 0; i < 7; i++ )
        {
            double ama = fabs( ma[i] );
            double amb = fabs( mb[i] );

            if (ama > 0)
                anyA = true;
            if (amb > 0)
                anyB = true;

            if( ma[i] > 0 )
                sma = 1;
            else if( ma[i] < 0 )
                sma = -1;
            else
                sma = 0;
            if( mb[i] > 0 )
                smb = 1;
            else if( mb[i] < 0 )
                smb = -1;
            else
                smb = 0;

            if( ama > eps && amb > eps )
            {
                ama = sma * log10( ama );
                amb = smb * log10( amb );
                result += fabs( -ama + amb );
            }
        }
        break;

    case 3:
        for( i = 0; i < 7; i++ )
        {
            double ama = fabs( ma[i] );
            double amb = fabs( mb[i] );

            if (ama > 0)
                anyA = true;
            if (amb > 0)
                anyB = true;

            if( ma[i] > 0 )
                sma = 1;
            else if( ma[i] < 0 )
                sma = -1;
            else
                sma = 0;
            if( mb[i] > 0 )
                smb = 1;
            else if( mb[i] < 0 )
                smb = -1;
            else
                smb = 0;

            if( ama > eps && amb > eps )
            {
                ama = sma * log10( ama );
                amb = smb * log10( amb );
                mmm = fabs( (ama - amb) / ama );
                if( result < mmm )
                    result = mmm;
            }
        }
        break;
    default:
        CV_Error( CV_StsBadArg, "Unknown comparison method" );
    }

    //If anyA and anyB are both true, the result is correct.
    //If anyA and anyB are both false, the distance is 0, perfect match.
    //If only one is true, then it's a false 0 and return large error.
    if (anyA != anyB)
        result = DBL_MAX;

    return result;
}

/* End of file. */