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Opencv笔记（1） 数据结构的命名规则（CvMat,...)
网上查了很多，发现查资料不如查源码
以Cv为开头的类，都是不含有具体数据的（仅仅存储指针）
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 ){／／低效率访问！ 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;Opencv笔记（1） 数据结构的命名规则（CvMat,...)
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