Camera, XO 1.5 vs XO 1

[Tiago Marques]

Hi Chris

On Sat, Apr 24, 2010 at 5:18 PM, Chris Ball <cjb at laptop.org> wrote:

> Hi Tiago,
>
> You don't mention which build you're using, and it's important because
> we're still making many changes to the camera setup, so please do that
> in future.
>

Sorry about that, it's the latest versions:

XO 1 uses 8.2.0(767), that's the latest stable right?
XO 1.5 10.2.0 build 120.



>
>   > - XO 1 has slower response time in the video being shown.
>
> I think this is probably http://dev <http://dev.laptop.org/ticket/10045>

* ** Blocked By:** *

*Blocking:** *

.laptop.org/ticket/10045 <http://dev.laptop.org/ticket/10045>.
>
> The 1.5 setup is capable of producing many more fps from the camera
> than 1.0, and Record doesn't use a framerate limiter on the preview
> window, with the result that you see a very high fps on the 1.5
> preview window at the cost of so much CPU use that Record becomes
> unresponsive.
>
> Daniel Drake's latest patches to Record add a framerate limiter to
> its preview window, which will make 1.5 behave more like 1.0.
>

I didn't said it became unresponsive, just that 1.5 was improved(at least
from a user's perspective). The high FPS is great, it's a shame that there
is never enough disk space to make use of it :)


>
>   > - XO 1 has a much brighter picture, which results in a
>   > much clearer one.  Even with good surrounding light, the 1.5
>   > shows a very dark image.
>
> Don't know about this.  We do have some control over brightness/gain
> in the kernel driver, I think.
>
>   > - XO 1.5 record isn't saving more than 2s of video.
>
> http://dev.laptop.org/ticket/10070.  Was fixed back in os119, as far
> as we know.
>

As above, tested in build 120 :|


>
>   > I thought that the camera sensor had been exchanged between
>   > revisions but I've just checked and it's the same. What gives?
>   > Software?
>
> Yes, the sensor's the same, but the hardware and software interfacing
> to it is different.
>
> os121 (about to be released) should be able to record video well,
> please re-test with that when it's out.
>

Ok, will do, thanks. For now it's mostly the darker image that's an issue.
It's not that it's bad per se, but the XO1 picture is definitely great.

Best regards,
Tiago



>
> - Chris.
> --
> Chris Ball   <cjb at laptop.org>
> One Laptop Per Child
>
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