calculate speed of changing floats & detect activity


    Apr 21 2012 | 7:08 pm
    Hi,
    i have built a patch (jit) to detect direction of movement in front of
    a camera (with cv.jit.lkflow).
    now i want to calculate the energy/speed of motion.
    x=s(t)/t
    s = [(last float value)-(first float value)]* (-1)
    t= (time of last float value) - (time of first float value)
    is anybody good at math? ( :
    i need to know:
    > when does movement start/ end (by a threshold time gap between float/bang(?) )
    > time in between
    objects that i have reviewed:
    counter, timer
    i don't get it.. ) :
    Probably there is another way to solve this problem, but I'm too stupid!
    thank you
    greetings

    • Apr 21 2012 | 10:16 pm
      Hi Fluxus,
      You probably don't need the time if you've got a reasonably consistent frame rate.
      Rather than multiply your difference by -1, consider just taking the absolute value instead: [abs 0.]
      hth
    • Apr 22 2012 | 12:45 am
      yeah, that's a good idea!
      thank you.
      do you know a object that stores the values in a way, that the operations can be processed?