Video tracking is tricky, but the basics are not too hard. In the Pd- extended Help Browser, check out these patches:
manuals -> 2.Image -> 17.tracking.pd examples -> Gem -> 04.video -> 03.movement_detection.pd
I am guessing the first is the one you want, its based on background
subtractions, which is a widely used technique.
.hc
On Mar 16, 2009, at 12:53 PM, Simon Ball wrote:
Hi there
I'm having trouble realising an idea. I've got the software running
(mac book pro) and managed to play with some of the examples,
however I am new to PD, so bare with me!I'm trying to generate a composition of images that float in 3D
space. I want the images or layers to move and rotate towards areas
of a screen where movement is detected. I don't need to track
specific points of motion, simply to judge where movement is taking
place. I think this will involve reading frames and analysing
changes in pixels. Does that make sense?I plan to use a mini DV camera to run this, on a high contrast
background, although I've seen a similar method of recording
movement with a webcam and processing, which worked pretty well. (http://vimeo.com/1948430?pg=embed&sec=
- tracks changes in pixels, although I'm not sure how).
I assume that this will involve some sort of trigonometry to move
images towards points where motion is detected, although I'm not
sure how to apply this in PD. Also, how to I generate a floating
effect, much like 'easing' does in animation software. And can this
work with 3D, mapped images in PD?I hope thats clear, if a little broad, let me know you need any
further info.Thanks in advance for any suggestions/solutions.
Simon
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