cvmGet和cvmSet中的bug CV_32FC1(float)和CV

本文详细介绍了CVM Get和CVM Set函数在处理不同类型数据时的实现方式，特别强调了仅支持float和double类型的限制，并提供了内部源码解析。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

cvmGet和cvmSet中的bug

2008-03-11 22:40

// 源码如下。也就是说只支持CV_32FC1(float)和CV_64FC1(double)的类型

// 对于U类型的数据，可以使用cvSet2D进行读写

CV_INLINE double cvmGet( const CvMat* mat, int row, int col )
{
int type;

    type = CV_MAT_TYPE(mat->type);
    assert( (unsigned)row < (unsigned)mat->rows &&
            (unsigned)col < (unsigned)mat->cols );

    if( type == CV_32FC1 )
        return ((float*)(mat->data.ptr + (size_t)mat->step*row))[col];
    else
    {
        assert( type == CV_64FC1 );
        return ((double*)(mat->data.ptr + (size_t)mat->step*row))[col];
    }
}

CV_INLINE void cvmSet( CvMat* mat, int row, int col, double value )
{
    int type;
    type = CV_MAT_TYPE(mat->type);
    assert( (unsigned)row < (unsigned)mat->rows &&
            (unsigned)col < (unsigned)mat->cols );

    if( type == CV_32FC1 )
        ((float*)(mat->data.ptr + (size_t)mat->step*row))[col] = (float)value;
    else
    {
        assert( type == CV_64FC1 );
        ((double*)(mat->data.ptr + (size_t)mat->step*row))[col] = (double)value;
    }
}

cvmGet和cvmSet中的bug CV_32FC1(float)和CV_64FC1(double)