Cycling 74 » Topic: calculate speed of changing floats & detect activity http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/feed Tue, 18 Jun 2013 20:36:17 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/#post-63111 <![CDATA[calculate speed of changing floats & detect activity]]> http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/#post-63111 Sat, 21 Apr 2012 19:08:33 +0000 fluxus 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

– Pasted Max Patch, click to expand. –
]]> http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/#post-227751 <![CDATA[Re: calculate speed of changing floats & detect activity]]> http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/#post-227751 Sat, 21 Apr 2012 22:16:25 +0000 Owen Green 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

]]> http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/#post-227752 <![CDATA[Re: calculate speed of changing floats & detect activity]]> http://cycling74.com/forums/topic/calculate-speed-of-changing-floats-detect-activity/#post-227752 Sun, 22 Apr 2012 00:45:54 +0000 fluxus 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?

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