On Fri, 16 Mar 2012 08:53:51 +1100
Xavion <xavio...@gmail.com> wrote:
> As you can probably gather from the attached screenshots, I'm
> attempting to use my SN9C201 webcam for home security. The problem is
> that it succumbs to external glare during the middle hours of sunny
> days when used in Linux.
>
> The same problem doesn't occur in Windows, probably since the software
> automatically adjusts to the current lighting conditions. These
> screenshots were taken only five minutes apart and the sunlight
> intensity didn't change much in-between.
>
> No amount of adjusting the webcam's settings (via V4L2-UCP) seemed to
> make any significant difference. For this reason, I'm guessing that
> there's at least one other adjustable setting that the GSPCA driver
> isn't tapping into yet.
[snip]
Hi Xavion,
It seems that the exposure is not set correctly. May you try the patch
below? (to be applied to the gspca test version 2.15.7 - the exposure
may be too low at init time, set it to 800)
--- build/sn9c20x.c~
+++ build/sn9c20x.c
@@ -1650,10 +1650,9 @@
case SENSOR_OV7670:
case SENSOR_OV9655:
case SENSOR_OV9650:
- exp[0] |= (3 << 4);
- exp[2] = 0x2d;
- exp[3] = expo;
- exp[4] = expo >> 8;
+ exp[0] |= (2 << 4);
+ exp[2] = 0x10; /* AECH */
+ exp[3] = expo * 255 / 0x1780;
break;
case SENSOR_MT9M001:
case SENSOR_MT9V112:
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
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