CV: information frequently used by mat

// CV: It is troublesome to obtain a certain value in the image in mat.

// Prerequisites
/*
/* \ Typedef
Access individual elements using [] operator etc.
Shorter aliases for the most popular specializations of VEC <t, n>

Typedef VEC <uchar, 2> vec2b;
Typedef VEC <uchar, 3> vec3b;
Typedef VEC <uchar, 4> vec4b;

Typedef VEC <short, 2> vec2s;
Typedef VEC <short, 3> vec3s;
Typedef VEC <short, 4> vec4s;

Typedef VEC <ushort, 2> vec2w;
Typedef VEC <ushort, 3> vec3w;
Typedef VEC <ushort, 4> vec4w;

Typedef VEC <int, 2> vec2i;
Typedef VEC <int, 3> vec3i;
Typedef VEC <int, 4> vec4i;
Typedef VEC <int, 6> vec6i;
Typedef VEC <int, 8> vec8i;

Typedef VEC <float, 2> vec2f;
Typedef VEC <float, 3> vec3f;
Typedef VEC <float, 4> vec4f;
Typedef VEC <float, 6> vec6f;

Typedef VEC <double, 2> vec2d;
Typedef VEC <double, 3> vec3d;
Typedef VEC <double, 4> vec4d;
Typedef VEC <double, 6> vec6d;

-------------------- Imread, second parameter ------------------------
Enum
{
// 8bit, color or not
Imread_unchanged =-1,
// 8bit, gray
Imread_grayscale = 0,
//?, Color
Imread_color = 1, // default
// Any depth ,?
Imread_anydepth = 2,
//?, Any color
Imread_anycolor = 4
};

------------------------ Mat common information ------------------------------
//! Returns element type, similar to cv_mat_type (cvmat-> type)

Int type () const; // 0, 1, 2,..., 6

//! Returns element type, similar to cv_mat_depth (cvmat-> type)

Int depth () const;

Common examples include:

Cv_8u:
Cv_8s:
Cv_16u:
Cv_16s:
Cv_32s:
Cv_32f:
Cv_64f:

//! Returns element type, similar to cv_mat_cn (cvmat-> type)
Int channels () const; // 1, 2, 3

//! The matrix dimensionality,> = 2
Int dims;

//! The number of rows and columns or (-1,-1) when the matrix has more than 2 dimensions
Int rows, cols;

//! Pointer to the data
Uchar * data;

------------------------------------
# Define cv_8u 0
# Define cv_8s 1
# Define cv_16u 2
# Define cv_16s 3
# Define cv_32s 4
# Define cv_32f 5
# Define cv_64f 6
# Define cv_usrtype1 7

CV _ [The number of bits per item] [signed or unsigned] [type prefix] C [the channel number]

string show_Mat_type( Mat mat_input ){string mat_type_name = "";//detect depthswitch ( mat_input.depth() ) {case CV_8U   :mat_type_name = "CV_8U";break;case CV_8S   :mat_type_name = "CV_8S";break;case CV_16U  :mat_type_name = "CV_16U";break;case CV_16S  :mat_type_name = "CV_16S";break;case CV_32S  :mat_type_name = "CV_32S";break;case CV_32F  :mat_type_name = "CV_32F";break;case CV_64F  :mat_type_name = "CV_64F";break;default:cout << "switch ( mat_input.depth() ) error!" << endl ;}//detect channelsswitch( mat_input.channels() ) {case 1 :mat_type_name += "C1";break;case 2 :mat_type_name += "C2";break;case 3 :mat_type_name += "C3";break;default:cout << "switch( mat_input.channels() ) error!" << endl ;}//uchar char short    switch( mat_input.type() % 8 ) {    case 0:      //cout<<  int( ((uchar*)mat.data + Cols*i+Chns*j )[k] )<<" ";      mat_type_name += " uchar";      break;          case 1:      //cout<<  int( (  (char*)mat.data + Cols*i+Chns*j)[k] )<<" ";           mat_type_name += " char";      break;          case 2:      //cout<<  (  (unsigned short*)mat.data + Cols*i+Chns*j)[k] <<" ";        mat_type_name += " ushort";      break;          case 3:      //cout<<  (  (short*)mat.data + Cols*i+Chns*j)[k] <<" ";           mat_type_name += " short";      break;          case 4:      //cout<<  (  (int*)mat.data + Cols*i+Chns*j)[k] <<" ";           mat_type_name += " int";      break;          case 5:      //cout<<  (  (float*)mat.data + Cols*i+Chns*j)[k] <<" ";        mat_type_name += " float";      break;          case 6:      //cout<<  (  (double*)mat.data + Cols*i+Chns*j)[k] <<" ";        mat_type_name += " double";      break;          default:       break;    }cout << "\n" << mat_type_name << endl ;return mat_type_name;}