7 Invariant Moments for Object Recognizing
If you want more information about Hu Moments, you can use following link
http://www.wseas.us/e-library/conferences/2013/CambridgeUK/AISE/AISE-15.pdf
Example
arr is an one dimensional array of object and arr must be binary image(0 and 1(not 255))
width and height is integer
HuMoments obj1(arr,width,height);
obj1.calcOrgins();
obj1.calcInvariantMoments();
float *moments = obj1.getInvariantMoments();
std::cout << moments[0] << endl << moments[1] << endl << moments[2] << endl << moments[3] << endl << moments[4] << endl << moments[5] << endl << moments[6] << endl;