[PD] Motion Detection Strategies - Gem

[Yves Degoyon]

IOhannes m zmoelnig wrote:

>David Powers wrote:
>  
>
>>Hi everyone,
>>
>>I bought a cheap Logitech webcam to try motion detection with PD+Gem.
>>I'm considering, among others things, using this as part of a digital
>>instrument design.
>>
>>First of all, the cheap webcam is of course rather noisy. But, the
>>motion detection doing:
>>
>>[pix_movement 0.3]
>>l
>>[alpha]
>>l
>>[pix_blob]
>>
>>definitely does seem to work okay.
>>
>>I did a test using the X and Y to control FM synthesis however, and it
>>mostly worked but tended to produce a lot of noise when something was
>>moving. What is the recommended way to smooth out the signal a bit?
>>
>>Also, best way to find the average speed of motion?
>>
>>Finally, are there more advanced motion detection strategies? Like,
>>say, could I somehow put a bright red dot on my index finger, and just
>>detect where my index finger is? I'd love to hear what people have
>>done.
>>
>>    
>>
>
>so you want to do color tracking?
>simplest thing is to just use the specified color-channel for [pix_blob]
>(e.g. [pix_blob 1] should just track the Red channel of an RGB signal
>(check the help-patch)).
>this only works in trivial cases (red, green, blue, white); for a more
>general approach convert the image's colorspace into hsv (with
>[pix_rgb2hsv] and mask out all colours you don't want on the
>colour-circle (e.g with [pix_curve]) and then track this.
>
>once you only have the pixel of the desired colour, you can of couse
>also do motion tracking on the color-filtered image.
>
>i thought i had some example of colortracking added to the gem-examples
>(but i might be wrong).
>
>
>mfg,.asd
>IOhannes
>
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>
>  
>
do you know pdp_shape ?

ciOa,

sevy
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