cvaux/src/cvcreatehandmask.cpp

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#include "_cvaux.h"

#define CV_MAX2( a, b ) ((a)>(b) ? (a) : (b))
#define CV_MIN2( a, b ) ((a)<(b) ? (a) : (b))

/****************************************************************************************\

   create hand mask

\****************************************************************************************/

static CvStatus icvCreateHandMask8uC1R(CvSeq * numbers,
                                       uchar * image_mask, int step,
                                       CvSize size, CvRect * roi )
{

    CvSeqReader reader;
    CvPoint pt;
    int k_point;
    int i_min, i_max, j_min, j_max;

    if( numbers == NULL )
        return CV_NULLPTR_ERR;

    if( !CV_IS_SEQ_POINT_SET( numbers ))
        return CV_BADFLAG_ERR;

    i_max = j_max = 0;
    i_min = size.height;
    j_min = size.width;

    cvStartReadSeq( numbers, &reader, 0 );

    k_point = numbers->total;
    assert( k_point > 0 );
    if( k_point <= 0 )
        return CV_BADSIZE_ERR;

    memset( image_mask, 0, step * size.height );

    while( k_point-- > 0 )
    {
        CV_READ_SEQ_ELEM( pt, reader );

        i_min = CV_MIN2( i_min, pt.y );
        i_max = CV_MAX2( i_max, pt.y );
        j_min = CV_MIN2( j_min, pt.x );
        j_max = CV_MAX2( j_max, pt.x );

        *(image_mask + pt.y * step + pt.x) = 255;
    }

    roi->x = j_min;
    roi->y = i_min;
    roi->width = j_max - j_min + 1;
    roi->height = i_max - i_min + 1;

    return CV_OK;

}


/*F///////////////////////////////////////////////////////////////////////////////////////
//    Name:     cvCreateHandMask
//    Purpose:  creates hand mask image
//    Context:   
//    Parameters: 
//      numbers - pointer to the input sequence of the point's indexes inside
//                hand region                
//      img_mask - pointer to the result mask image 
//      roi      - result hand mask ROI 
//      
//    Notes:
//F*/
CV_IMPL void
cvCreateHandMask( CvSeq * numbers, IplImage * img_mask, CvRect * roi )
{
    uchar *img_mask_data = 0;
    int img_mask_step = 0;
    CvSize img_mask_size;

    CV_FUNCNAME( "cvCreateHandMask" );

    __BEGIN__;

    if( img_mask->depth != IPL_DEPTH_8U )
        CV_ERROR( CV_BadDepth, cvUnsupportedFormat );

    if( img_mask->nChannels != 1 )
        CV_ERROR( CV_BadNumChannels, "output image have wrong number of channels" );

    cvGetImageRawData( img_mask, &img_mask_data, &img_mask_step, &img_mask_size );

    IPPI_CALL( icvCreateHandMask8uC1R( numbers, img_mask_data,
                                        img_mask_step, img_mask_size, roi ));

    __END__;
}