cvthresh.cpp.svn-base

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#include "_cv.h"

/*F///////////////////////////////////////////////////////////////////////////////////////
//    Name:    icvThreshold8uC1R
//    Purpose: Thresholding the source array
//    Context:
//    Parameters:
//      Src     - source array
//      roi     - size of picture in elements
//      srcStep - length of string
//      Thresh  - threshold parameter
//      Type    - thresholding type, must be one of
//                  CV_THRESH_BINARY       - val = (val > Thresh ? MAX    : 0)
//                  CV_THRESH_BINARY_INV   - val = (val > Thresh ? 0      : MAX)
//                  CV_THRESH_TRUNC        - val = (val > Thresh ? Thresh : val)
//                  CV_THRESH_TOZERO       - val = (val > Thresh ? val    : 0)
//                  CV_THRESH_TOZERO_INV   - val = (val > Thresh ? 0      : val)
//    Returns:
//    Notes:
//      The MAX constant for uchar is 255, for char is 127
//F*/
IPCVAPI_IMPL( CvStatus, icvThresh_8u_C1R, (const uchar * src,
                                           int src_step,
                                           uchar * dst,
                                           int dst_step,
                                           CvSize roi,
                                           int thresh, uchar maxval, CvThreshType type) )
{
    /* Some variables */
    int i, j;

    /* Check for bad arguments */
    assert( src && dst );
    if( thresh & ~255 )
        return CV_BADFACTOR_ERR;
    if( roi.width <= 0 || roi.height <= 0 )
        return CV_BADSIZE_ERR;
    if( roi.width > src_step )
        return CV_BADSIZE_ERR;
    if( roi.width > dst_step )
        return CV_BADSIZE_ERR;

    if( roi.width == src_step && roi.width == dst_step )
    {
        roi.width *= roi.height;
        roi.height = 1;
    }

    /* Calculating */
    switch (type)
    {
    case CV_THRESH_BINARY:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
                dst[j] = (uchar) (((thresh - src[j]) >> 8) & maxval);
        break;
    case CV_THRESH_BINARY_INV:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
                dst[j] = (uchar) (((src[j] - thresh - 1) >> 8) & maxval);
        break;
    case CV_THRESH_TRUNC:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
            {
                int temp = src[j] - thresh;

                dst[j] = (uchar) ((temp & (temp >> 31)) + thresh);
            }
        break;
    case CV_THRESH_TOZERO:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
            {
                int temp = src[j];

                dst[j] = (uchar) (((thresh - temp) >> 31) & temp);
            }
        break;
    case CV_THRESH_TOZERO_INV:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
            {
                int temp = src[j];

                dst[j] = (uchar) (((temp - thresh - 1) >> 31) & temp);
            }
        break;
    default:
        return CV_BADFLAG_ERR;
    }
    return CV_NO_ERR;
}


/*F///////////////////////////////////////////////////////////////////////////////////////
//    Name:    icvThreshold8sC1R
//    Purpose: Thresholding the source array
//    Context:
//    Parameters:
//      Src     - source array
//      roi     - size of picture in elements
//      srcStep - length of string
//      Thresh  - threshold parameter
//      Type    - thresholding type, must be one of
//                  CV_THRESH_BINARY       - val = (val > Thresh ? MAX    : 0)
//                  CV_THRESH_BINARY_INV   - val = (val > Thresh ? 0      : MAX)
//                  CV_THRESH_TRUNC        - val = (val > Thresh ? Thresh : val)
//                  CV_THRESH_TOZERO       - val = (val > Thresh ? val    : 0)
//                  CV_THRESH_TOZERO_INV   - val = (val > Thresh ? 0      : val)
//    Returns:
//    Notes:
//      The MAX constant for uchar is 255, for char is 127
//F*/
IPCVAPI_IMPL( CvStatus, icvThresh_8s_C1R, (const char *src,
                                           int src_step,
                                           char *dst,
                                           int dst_step,
                                           CvSize roi,
                                           int thresh, char maxval, CvThreshType type) )
{
    /* Some variables */
    int i, j;

    /* Check for bad arguments */
    if( !src || !dst )
        return CV_NULLPTR_ERR;
    if( thresh < -128 || thresh > 127 )
        return CV_BADFACTOR_ERR;
    if( roi.width <= 0 || roi.height <= 0 )
        return CV_BADSIZE_ERR;
    if( roi.width > src_step )
        return CV_BADSIZE_ERR;
    if( roi.width > dst_step )
        return CV_BADSIZE_ERR;

    if( roi.width == src_step && roi.width == dst_step )
    {
        roi.width *= roi.height;
        roi.height = 1;
    }

    /* Calculating */
    switch (type)
    {
    case CV_THRESH_BINARY:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
                dst[j] = (char) (((thresh - src[j]) >> 8) & maxval);
        break;
    case CV_THRESH_BINARY_INV:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
                dst[j] = (char) (((src[j] - thresh - 1) >> 8) & maxval);
        break;
    case CV_THRESH_TRUNC:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
            {
                int temp = src[j] - thresh;

                dst[j] = (char) ((temp & (temp >> 31)) + thresh);
            }
        break;
    case CV_THRESH_TOZERO:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
            {
                int temp = src[j];

                dst[j] = (char) (((thresh - temp) >> 31) & temp);
            }
        break;
    case CV_THRESH_TOZERO_INV:
        for( i = 0; i < roi.height; i++, src += src_step, dst += dst_step )
            for( j = 0; j < roi.width; j++ )
            {
                int temp = src[j];

                dst[j] = (char) (((temp - thresh - 1) >> 31) & temp);
            }
        break;
    default:
        return CV_BADFLAG_ERR;
    }