title: Horn-Schunck optical flow calculations
body: <p>I was studying the Horn-schunck method for calculating optical flow in videos. My code is in C, which would mean i am implementing all of the algorithms from scratch including gray-scaling the image, computing derivatives etc. I am not able to completely absorb the essence of the method. The final flow matrix that I get would contain displacement vectors for each pixel, right? Meaning for each pixel, the value in the flow matrix would indicate the amount by which it is displaced in the next image. </p>
  
  <p>How does this work out when I have all pixel values between 0-255, all my calculations are done on these pixel values and the resulting output gives displacement in, say, a 1920 X 1080 image.</p>