2008/8/6 Grégory Lardière <[EMAIL PROTECTED]>
> Hi,
>
> I own a FSC Xi 2550 laptop with a s5k4aa-based bisoncam, and I've been
> playing lately with the s5k4aa branch, trying to figure out the meaning of
> sensor registers and trying to get the best image and framerate. I achieved
> stable 1280x1024 picture at 15 fps and stable 640x480 picture at 31fps.
>
> I've attached 3 patches :
>
> livecam.patch (against rev 13) :
> - adds 1280x1024 BAYER resolution
> - implements a bayer decoding which works with s5k4aa. It seems to be a
> SRGGB8 encoding or a reversed SBGGR8. It's a naive implementation which
> doesn't decode the image border because it's easier for interpolation.
> Colors look fine but would need additional correction because it's a little
> greenish.
>
> m560x_1280x1024_15fps.patch :
> - program the sensor for a 1280x1024 window
> - set the clock at 48MHz and tweak register 0x1e to achieve image
> stability at 15fps. Samsung says their sensor can achieve [EMAIL PROTECTED],
> but I can't get a stable image at 60MHz clock.
>
> m560x_640x480_31fps.patch :
> - program the sensor for a 1280x960 window
> - enable column skip x2 and row skip x2 (bits 0 and 3 of register 0x03 ;
> there are also bits for horizontal/vertical flip, and col/row skip x4).
> - adjust clock and register 0x1e for stable 31fps image. I don't know
> exactly what's the meaning of this register, maybe "hblank".
>
> I noticed the image becomes unstable when luminosity is too high, in this
> case, reducing register 0x0f helps restoring stability.
>
> Hope it helps...
>
> greg
>
Many thanks for the patches.
Regards,
Erik
>
>
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