[PD] Gem image analysis

[Thomas Ouellet Fredericks]

Again:

Use pix_movement.
Analyse with [pix_blob 4] (alpha channel)
The last outlet of pix_blob gives you the amount of movement in the image.

Tm

On 5/30/05, chris clepper <cgc at humboldtblvd.com> wrote:
> Max
> 
> How about measuring the change in the pix_blob output?  If if changes
> more than a certain threshold amount that would normally be a sign of
> some new action in the frame.  You could also detect the edges of the
> frame for objects entering view.  A table with the past few frames
> might help smooth things out and improve accuracy as well.
> 
> cgc
> 
> On May 30, 2005, at 6:22 PM, Max Neupert wrote:
> 
> > hi IOhannes, thomas, list
> >
> > sorry for beeing unclear, pix_blob seems already too intelligent for
> > what i need. i do NOT want to TRACK anything. i just want to know if
> > there is ANY motion in the image and not where.
> > so again: it's not about tracking it is about movement.
> > my approch was to use pix_movement because it provides the first step
> > in the analysis: removing everything what stays. but how to "measure"
> > the white areas after without tracking them? i am not interested in
> > the coordinates of blobs.
> >
> > max
> >
> >
> >
> >
> > Am 30.05.2005 um 17:09 schrieb IOhannes m zmoelnig:
> >
> >> Max Neupert wrote:
> >>> hi list,
> >>> how do i turn a camera in a motion sensor?
> >>> i can extract the movement with pix_movement, that's clear. but how
> >>> to get a numeric value out of the whole picture corresponding to the
> >>> pictures grayscale value?
> >>> (not from a single pixel like pix_data supplies)
> >>> am i completely overseeing something?
> >>
> >> yes:
> >> [pix_blob] does blob-detection (only 1 single blob though)
> >> there should be an example-patch on how to do movement-detection with
> >> this: 04.video/03.movement_detection.pd
> >>
> >> if using the CVS is an option for you, there is [pix_multiblob] which
> >> is far better (detects multiple blobs, gives more information on
> >> them)
> >>
> >> there is even an abstraction (with example-patch) for blob-tracking.
> >>
> >> mfg.ad.sr
> >> IOhannes
> >>
> >>
> >>> max
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> 
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