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Re: [Spca50x-devs] is this normal picture quality on Labtec Webcam Pro?

Le Mardi 17 Juillet 2007 18:00, Miernik a écrit :
> I don't know if the picture quality is always so bad with this webcam,
> or do I have wring settings, or something?
> http://miernik.name/var/tmp/labtec-webcam-pro-test-01.jpeg
> This was captured with 'spcaview -b -g -f -r32 -l -N 1' but more or less
> whatever options I use, the result is equally bad.  I don't want a
> high-resolution picture, I just want a decent quality 640x480 picture.
> Take a look at the yellow wall in the upper-right corner. In reality it
> is a perfectly painted clean yellow wall, on this picture it looks like
> a dirty wall with stains all over the place. This is indoors at daytime.
> I manipulated the light conditions, and spcaview settings, and camera
> focus, and this is the best I could get. What the heck is wrong? Are
> these cameras really so crap, or can you get a better 640x480 picture
> with the right software and settings? If not, then what inexpensive
> webcam will give me a decent quality low resolution picture without
> spending a fortune? BTW: This was made with the use of a tripod.
> On http://article.gmane.org/gmane.linux.drivers.spca50x.devel/1548 there
> is a picture from the very same model of webcam, and the quality is much
> better, the wall of the house is really clean yellow, and clouds look
> like coulds, and not like toilet paper.
> Here is how this was captured:
> miernik@tarnica:~$ spcaview -b -g -f r32 -l -N 1
>  Spcaview version: 1.1.5 date: 12:12:2005 (C) mxhaard@xxxxxxxx
> Initializing SDL.
> SDL initialized.
> bpp 4 format 5
> Using video device /dev/video0.
> Initializing v4l.
> **************** PROBING CAMERA *********************
> Camera found: Labtec Webcam Pro
> Bridge found: ZC301-2
> Bridge find ZC301-2 number 13
> StreamId: JPEG Camera
> wrong spca5xx device
> Bridge find ZC301-2 number 13
> Available Resolutions width 640  heigth 480 native *
> Available Resolutions width 352  heigth 288 decoded
> Available Resolutions width 320  heigth 240 native
> Available Resolutions width 176  heigth 144 decoded
> *****************************************************
>  grabbing method READ asked
> VIDIOCGWIN height 480  width 640
> brightnes=32768 hue=0 color=0 contrast=32768 whiteness=0
> depth=24 palette=4
> brightness=32768 hue=0 color=0 contrast=32768 whiteness=0
> depth=32 palette=5
> VIDIOCSPICT newbright:34018
> brightness=34018 hue=0 color=0 contrast=32768 whiteness=0
> depth=32 palette=5
> VIDIOCSPICT newbright:35268
> brightness=35268 hue=0 color=0 contrast=32768 whiteness=0
> depth=32 palette=5
> VIDIOCSPICT newbright:36518
> brightness=36518 hue=0 color=0 contrast=32768 whiteness=0
> depth=32 palette=5
>  picture rgb32 07:17:2007-17:58:39-P0000.jpg
> VIDIOCSPICT newbright:37718
> brightness=37718 hue=0 color=0 contrast=32768 whiteness=0
> depth=32 palette=5
> Used 1171ms for 14 images => 83ms/image 11fps.
> Quiting SDL.
> Decoded frames:14 Average decode time: 25.000000
> closing
> closed
> Destroy Picture thread ...
> Quiting....
> miernik@tarnica:~$
spcaview -f jpg -l 
Don't adjust brightness contrast and so on 
To take the picture press the s key when you have the focus on the grabing 
Michel Xhaard

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