Getting ready for the final exams+Numerical Gradient

We are currently studying for our final exams that will start on 25 May and end on 15 June.... what gives us hope inside all the pressure and bordem we suffer from while studying is this is the last time we will study for finals exams... ofcourse we don't have time to work on VideoSurgeon now. We managed befrore studying to integrate the object detection module into the module that dissembles the video into frames and allows the user to select the required object contour. We also wrote the code for object tracking module but we still need to test them all. We also started to code the background completion module. There is a function in Matlab that calculates the numerical gradient of a matrix. We need it in the background completion, so we want to know how it is calcualted to implement it in Java. Until we stopped we didn't figure out how to write it. If you know any information about it please don't hesitate to tell us. Pray for us to do well in our exams!