C++ (Cpp) CV_CALC_MIN_8U Beispiele

Beispiel #1

Datei: distransform.cpp Projekt: 2december/opencv

//BEGIN ATS ADDITION
// 8-bit grayscale distance transform function
static void
distanceATS_L1_8u( const Mat& src, Mat& dst )
{
    int width = src.cols, height = src.rows;

    int a;
    uchar lut[256];
    int x, y;

    const uchar *sbase = src.ptr();
    uchar *dbase = dst.ptr();
    int srcstep = (int)src.step;
    int dststep = (int)dst.step;

    CV_Assert( src.type() == CV_8UC1 && dst.type() == CV_8UC1 );
    CV_Assert( src.size() == dst.size() );

    ////////////////////// forward scan ////////////////////////
    for( x = 0; x < 256; x++ )
        lut[x] = cv::saturate_cast<uchar>(x+1);

    //init first pixel to max (we're going to be skipping it)
    dbase[0] = (uchar)(sbase[0] == 0 ? 0 : 255);

    //first row (scan west only, skip first pixel)
    for( x = 1; x < width; x++ )
        dbase[x] = (uchar)(sbase[x] == 0 ? 0 : lut[dbase[x-1]]);

    for( y = 1; y < height; y++ )
    {
        sbase += srcstep;
        dbase += dststep;

        //for left edge, scan north only
        a = sbase[0] == 0 ? 0 : lut[dbase[-dststep]];
        dbase[0] = (uchar)a;

        for( x = 1; x < width; x++ )
        {
            a = sbase[x] == 0 ? 0 : lut[MIN(a, dbase[x - dststep])];
            dbase[x] = (uchar)a;
        }
    }

    ////////////////////// backward scan ///////////////////////

    a = dbase[width-1];

    // do last row east pixel scan here (skip bottom right pixel)
    for( x = width - 2; x >= 0; x-- )
    {
        a = lut[a];
        dbase[x] = (uchar)(CV_CALC_MIN_8U(a, dbase[x]));
    }

    // right edge is the only error case
    for( y = height - 2; y >= 0; y-- )
    {
        dbase -= dststep;

        // do right edge
        a = lut[dbase[width-1+dststep]];
        dbase[width-1] = (uchar)(MIN(a, dbase[width-1]));

        for( x = width - 2; x >= 0; x-- )
        {
            int b = dbase[x+dststep];
            a = lut[MIN(a, b)];
            a = MIN(a, dbase[x]);
            dbase[x] = (uchar)(a);
        }
    }
}

Beispiel #2

Datei: cvdistransform.cpp Projekt: lubyk/cv

/* 8-bit grayscale distance transform function */
static void
icvDistanceATS_L1_8u( const CvMat* src, CvMat* dst )
{
    int width = src->cols, height = src->rows;

    int a;
    uchar lut[256];
    int x, y;
    
    const uchar *sbase = src->data.ptr;
    uchar *dbase = dst->data.ptr;
    int srcstep = src->step;
    int dststep = dst->step;

    CV_Assert( CV_IS_MASK_ARR( src ) && CV_MAT_TYPE( dst->type ) == CV_8UC1 );
    CV_Assert( CV_ARE_SIZES_EQ( src, dst ));

    ////////////////////// forward scan ////////////////////////
    for( x = 0; x < 256; x++ )
        lut[x] = CV_CAST_8U(x+1);

    //init first pixel to max (we're going to be skipping it)
    dbase[0] = (uchar)(sbase[0] == 0 ? 0 : 255);

    //first row (scan west only, skip first pixel)
    for( x = 1; x < width; x++ )
        dbase[x] = (uchar)(sbase[x] == 0 ? 0 : lut[dbase[x-1]]);

    for( y = 1; y < height; y++ )
    {
        sbase += srcstep;
        dbase += dststep;

        //for left edge, scan north only
        a = sbase[0] == 0 ? 0 : lut[dbase[-dststep]];
        dbase[0] = (uchar)a;

        for( x = 1; x < width; x++ )
        {
            a = sbase[x] == 0 ? 0 : lut[MIN(a, dbase[x - dststep])];
            dbase[x] = (uchar)a;
        }
    }

    ////////////////////// backward scan ///////////////////////

    a = dbase[width-1];

    // do last row east pixel scan here (skip bottom right pixel)
    for( x = width - 2; x >= 0; x-- )
    {
        a = lut[a];
        dbase[x] = (uchar)(CV_CALC_MIN_8U(a, dbase[x]));
    }

    // right edge is the only error case
    for( y = height - 2; y >= 0; y-- )
    {
        dbase -= dststep;

        // do right edge
        a = lut[dbase[width-1+dststep]];
        dbase[width-1] = (uchar)(MIN(a, dbase[width-1]));

        for( x = width - 2; x >= 0; x-- )
        {
            int b = dbase[x+dststep];
            a = lut[MIN(a, b)];
            dbase[x] = (uchar)(MIN(a, dbase[x]));
        }
    }
}