[Sugar-devel] [ASLO] webcam images and control

[Aleksey Lim]

On Thu, Feb 25, 2010 at 03:39:26PM +0100, Emmanuel Di Folco wrote:
> Dear all,
> I am developing pedagogical activities using the integrated webcam of  
> the XO laptop.
> My project aims at taking images of the Moon, by fixing a small scope  
> in front of the webcam.
> I am now facing the following problems:
> - images are saturated because there is an automatic adjustment of  
> the gain (or of the camera integration time ?)
> - images are compressed (JPG) and hence of very poor quality
> 
> I am using the "Record" activity to make the images.
> 
> I would like to be able to :
> - control the gain or integration time of the camera (mode Photo, not  
> video) in order not to saturate (this is obviously feasible, since  
> the images taken during the day are not saturated !)
> - eventually restrict the size of the screen window that is  
> considered by the 'automatic gain adjustment algorithm' (where I  
> would insert the moon)
> - gather the raw images, not the JPG compressed ones.

Did you considered using gstreamer directly in your activity to capture
images in format you need?

> 
> Could any one help me ?
> Thanks in advance & best regards,
> E. Di Folco
> CEA + La Main a la pate (France)
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-- 
Aleksey