Re: [Spca50x-devs] disable auto color balance on Zc0302

[michel Xhaard <mxhaard@xxxxxxxx>]

Le Samedi 11 Mars 2006 17:04, Stephan Walter a ÃcritÂ:
> Hi,
>
> I have a Labtec Webcam Pro with a Zc0302 controller and a PAS202BCB
> sensor. The camera seems to adjust the color values, which is very
> irritating as I am trying to detect certain colors for a robotic project.
> Is there a way to turn this off?
>
> I haven't found a datasheet of either chip that shows the
> internal registers and how to program them, but I think there must be a
> way to turn it off.
>
> -Stephan Walter
>
>
Stephan,
I have set a private spca5xx ioctl for that, maybe have a look at spcav4l.c 
and spcav4l.h in the spcaview package.
here is the function to set or unset that feature , the same videoparam 
structure is used for AutoExposureWhiteBalance,Set the times interval between 
each frame in ms , and the quantization table for the zc030x chipset.
the field chg_para work like a key and need to be set with the proper mask 
before changing one of the field. 
void
spcaSetAutoExpo(struct vdIn *vdin)
{
	struct video_param *videoparam= &vdin->videoparam;
	int fd = vdin->fd;
	videoparam->chg_para = CHGABRIGHT;
	videoparam->autobright = !videoparam->autobright;
	if(ioctl(fd,SPCASVIDIOPARAM, videoparam) == -1){
		printf ("autobright error !!\n");
	} else
		spcaPrintParam (fd,videoparam);
	
}
best regards
PS: If one day you find a manufacter that give internal chips documentation 
let me know :)
-- 
Michel Xhaard
http://mxhaard.free.fr


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