网上搜索了很多，检查中发现的信息劣势，检查源代码
同Cv为类的开始。包含详细的数据不（仅存储指针）
CvMat
typedef struct CvMat
{
int type;
int step; /* for internal use only */
int* refcount;
int hdr_refcount; union
{
uchar* ptr;
short* s;
int* i;
float* fl;
double* db;
} data;
<pre name="code" class="cpp">
#ifdef __cplusplus union { int rows; int height; }; union { int cols; int width; };#else int rows; int cols;#endif}CvMat;
<pre name="code" class="cpp">CV_INLINE CvMat cvMat( int rows, int cols, int type, void* data CV_DEFAULT(NULL))
{
CvMat m; assert( (unsigned)CV_MAT_DEPTH(type) <= CV_64F );
type = CV_MAT_TYPE(type);
m.type = CV_MAT_MAGIC_VAL | CV_MAT_CONT_FLAG | type;
m.cols = cols;
m.rows = rows;
m.step = m.cols*CV_ELEM_SIZE(type);
m.data.ptr = (uchar*)data;
m.refcount = NULL;
m.hdr_refcount = 0; return m;
}
CV_INLINE double cvmGet( const CvMat* mat, int row, int col )
{／／低效率訪问！
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*)(void*)(mat->data.ptr + (size_t)mat->step*row))[col];
else
{
assert( type == CV_64FC1 );
return ((double*)(void*)(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*)(void*)(mat->data.ptr + (size_t)mat->step*row))[col] = (float)value;
else
{
assert( type == CV_64FC1 );
((double*)(void*)(mat->data.ptr + (size_t)mat->step*row))[col] = (double)value;
}
}
typedef struct CvMatND
{
int type;
int dims; int* refcount;
int hdr_refcount; union
{
uchar* ptr;
float* fl;
double* db;
int* i;
short* s;
} data; struct
{
int size;
int step;
}
dim[CV_MAX_DIM];
}
CvMatND;
/* Basic element of the file storage - scalar or collection: */
typedef struct CvFileNode
{
int tag;
struct CvTypeInfo* info; /* type information
(only for user-defined object, for others it is 0) */
union
{
double f; /* scalar floating-point number */
int i; /* scalar integer number */
CvString str; /* text string */
CvSeq* seq; /* sequence (ordered collection of file nodes) */
CvFileNodeHash* map; /* map (collection of named file nodes) */
} data;
}
CvFileNode;