## 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?