c++ - Get Orientation Histogramm from Pixel Patch OpenCV -

i try orientation histogramm out of result of phase() method cv. try rounded orientation of each pixel , divide 10. example 5x5 pixel patch:

{ 1 36 20 3 14 5 16 11 6 9 7 12 34 22 0 34 5 9 21 4 5 21 28 30 1} 

my problem is, dont know how scan each pixel of patch , orientationvalue of calculate value histogram.

my code getting orientation mat looks this:

 mat patch = src(rect(px,py,15,15));   mat sx;  sobel(patch, sx, cv_32f, 1, 0, 3);   mat sy;  sobel(patch, sy, cv_32f, 0, 1, 3);   mat mag, ori;  magnitude(sx, sy, mag);  phase(sx, sy, ori, true);   int** hist; 

in variable hist want add values through method. hope understands i'm thinking of , can me.

i have plan now, how iterate through given orientation image use loop shown in documentation opencv docu

for( = 0; < ori.rows; i++){     for( j = 0; j < ori.cols; j++){         cout << ori.at<uchar>(i,j) << endl;     } } 

but accessing values wont give me orientation value. clues?

ori type cv_32f not cv_8u, try ori.at<float>(i,j) ro access orientation values