Opencv笔记（1）命名规则数据结构（CvMat,...)

末蓝、 2022-03-31 18:30 207阅读 0赞

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;