{

string infile = "input/sky.jpg";

string outfile = "sky2.jpg";

double d;

int i2, nRows, nCols, channels;

Mat I, I1, I2, I3, I4, I5;

//create

I = Mat(2,2, CV_8UC3, Scalar(0,127,255));

//2x2 image, r=0, g=127 b=255

//CV_8UC3

//each item (red, green or blue) 8 bits long

//U: unsigned

//C3: 3 channels

I1 = Mat(2,2, CV_8UC3, Scalar::all(0));

//all black

I2 = Mat(I);

//copy constructor

//data is *not* copied

I3 = I2;

//data is *not* copied

I4 = I1.clone();

//data is copied

I1.copyTo(I4);

//data is copied

cout << "info" << endl;

I = Mat(2,2, CV_8UC3, Scalar(0,127,255));

cout << "cout" << endl << I << endl;

cout << "python" << endl << format(I,"python") << endl;

//cout << "cvs" << endl << format(I,"cvs") << endl;

cout << "numpy" << endl << format(I,"numpy") << endl;

cout << "rows" << endl << I.rows << endl;

//2

cout << "cols" << endl << I.cols << endl;

//2

cout << "step" << endl << I.step << endl;

cout << "depth()" << endl << I.depth() << endl;

//CV_8U

cout << "CV_8U" << endl << CV_8U << endl;

//CV_8U

cout << "channels()" << endl << I.channels() << endl;

//3

cout << "isContinuous()" << endl << I.isContinuous() << endl;

//?

//if true, storage is one big array in memery

//and can therefore be looped with pointers directly

//otherwise, stored rows are continuous in memory

cout << "access elements" << endl;

cout << "row pointers" << endl;

CV_Assert(I.depth() == CV_8U);

channels = I.channels();

nRows = I.rows;

nCols = I.cols * channels;

if (I.isContinuous())

{

nCols *= nRows;

nRows = 1;

}

uchar* p;

for(int i = 0; i < nRows; ++i)

{

p = I.ptr<uchar>(i);

for (int j = 0; j < nCols; ++j)

{

cout << (int)p[j] << " ";

//p[j] = 0; //assigment is ok too

}

cout << endl;

for (int j = 0; j < nCols; j=j+channels)

{

//THERE IS SOMETHING ABOUT COLORS BEING INVERTED as b,g,r and not r,g,b

cout << "b " << (int)p[j] << endl;

cout << "g " << (int)p[j+1] << endl;

cout << "r " << (int)p[j+2] << endl;

//cout << "a " << (int)p[j+4] << endl;

}

cout << endl;

}

cout << "continuous array with pointer" << endl;

if (I.isContinuous()){

uchar* p = I.data;

for( int i =0; i < nCols*nRows; ++i){

cout << (int)*p << " ";

p++;

}

} else {

cout << "not continuous" << endl;

}

//fileio

I1 = imread( infile, 1 );

imwrite( outfile, I1 );

//highgui

namedWindow( "sky", CV_WINDOW_AUTOSIZE );

namedWindow( "gray", CV_WINDOW_AUTOSIZE );

imshow( infile, I1 );

imshow( "gray", I1 );

waitKey(0);

cout << "\nprofiling\n" << endl;

d = (double)getTickCount();

for(int i=0; i<1000; i++)

i2++;

d = ((double)getTickCount() - d)/getTickFrequency();

cout << "seconds " << d << endl;

cout << "error handling" << endl;

CV_Assert(true);

//EXCEPTION:

//CV_Assert(false);

//cvtColor( I1, gray_I1, CV_RGB2GRAY );

return 0;