[GEM-dev] kinect camera object for Gem

[Hans-Christoph Steiner]

On Feb 18, 2011, at 11:04 PM, Mathieu Bouchard wrote:

> On Sat, 19 Feb 2011, Matteo Sisti Sette wrote:
>>> Le 18/02/2011 19:23, Hans-Christoph Steiner a écrit :
>>>> I don't think there is a driver that'll just give you the video and
>>>> the depth. Its like a video camera with two images per frame: the
>>>> normal video frame and the depth frame.
>> Wouldn't it be possible to have the depth value in the alpha  
>> channel and so obtain a single rgba image?
>
> Video4Linux1's VIDEO_PALETTE does not mention any alpha format.
>
> Video4Linux2's V4L2_PIX_FMT does not mention any alpha format either.
>
> In Video4Linux2's V4L2_FBUF_FLAG there are three things called  
> alpha. They're related to overlay. That's a thing for capture cards  
> that can write directly to the graphics card.
>
> There's nothing really for 4 channels... well, maybe there is.
> There is RGGB, BGGR, GBRG, you know, the Bayer stuff that has double  
> the resolution for the G channel, that is used in "raw" cameras. A  
> Video4Linux driver could use that fourcc.
>
> But I don't know whether there are any restrictions to having kernel  
> drivers create their own fourcc as long as an app accepts it.
>
> However, current linux support for the Kinect doesn't use any kernel  
> drivers, right ? Both existing libs use libusb, which is userspace.


I believe that there is both: the libusb/libfreenect approach, which  
will work on GNU/Linux, Mac OS X, and perhaps also Windows, and the  
Linux kernel driver approach.

.hc

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