[PD] Gem image analysis

chris clepper cgc at humboldtblvd.com
Tue May 31 02:23:42 CEST 2005


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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