[PD] track position with background substration

[B. Bogart]

Hi Yukio,

Look up pix_background, that saves a "background" image, that is
subtracted from the "live" video frames. There is also a threshold to
accept some noise difference between a live video image of the
background and a single stored frame.

.b.


yukio wrote:
>  hi, is it possible to track the possition of elements using  background
>  substration in gem?
> 
> i made i project using pix_movement in conjuntion with pix_multiblob,
> and worked fine , but it seems pix_multiblob is just able to do the
> detecting throuht brightness thresholding.
> my question is about doing the same but withouht brithghtness
> thresholding.
> 
> in other systems like eyeweb  i can compare each frame of the video with
> a stored image of the scene background.the system can detect and give me
> the coordinates of the new objects or people in my scene. This is called
> background substration . so my question is :
> is there any way to have a multiblob tracker but that works with
> background substration instead of brightness thresholding?
> 
> many thanx 
> 
> yuki