The terms Ix^2 and Iy^2 denote the second derivatives wrt to x and y. However, that matrix is sometimes ill conditioned, so you may want to google 'good features to track' by Shi&Tomosi which discusses that problem.
The terms Ix^2 and Iy^2 denote the second derivatives wrt to x and y. However, that matrix is sometimes ill conditioned, so you may want to google 'good features to track' by Shi&Tomosi which discusses that problem.
I am a french student and I tried make your algorythm work with python but I have a problem (I don't know if it is me or the pdf). when I compute the G matrix , this one is always uninvertible (I dont see how it would be possible to invert a Matrix [[Ix²,Ix*Iy],[IX*Iy,Iy²]] because the determinant is always 0) could you help me please?
