[theora] Theora Intra (ptalarbvorm) vs. MJPEG
theora at elphel.com
Wed May 12 12:27:48 PDT 2010
> I see a lot of sense in these assertions. However, what pops-up to me
> for a regular user is that it's an additional step they have to take,
> and most tools don't already feature this capability. It seems that, if
> we incorporate such a codec into the resulting product, then we will
> have to also have software ready for the consumer to use to do the
Yes, sure it needs software to process. But there are multiple ways how to
make it seamless.
> I'm looking at the page now. It's very interesting...
That page was designed to be a supplement to the article
Here is a link to ImageJ plugin for JP46. Additionally it reads Exif
MakerNote field and un-applies gamma and analog gains, so ImageJ gets
floating point pixel data proportional to the number of photons the sensor
> > So far most JP46 images were used for still images (with Elphel model
> > 323 and 353 cameras) but now we at least some solutions for the video
> > and continue to work in this direction. And there could be
> > alternatives to literal JP4 implementation
> I did see some video samples of the JP46 video, but I don't think I saw
> the resulting demosaiced video.
There are several here and there - made by ourselves (i.e.
but you can find much more processed stills made by others.
> It would be great if we had some raw Bayer video footage. I don't have
> any right now...can anyone point us to some? It would also be nice if
> JP46 was available as an actual codec to use for "compressing" the raw
> Bayer video as well. Supposedly my webcam (Logitech Webcam C600) has
> the ability to send raw Bayer pixel data, but I don't know in what
> format that is.
Yes, it could be applicable to other cameras too - JP4 is basically JPEG
with different color components and pixels rearranged for optimal
compression of Bayer data. Funny thing that I am not aware of any software
JP4/JP46 encoder - from the very beginning it ran in the hardware (
modified from the regular color 4:2:0 JPEG I implemented earlier. And there
are multiple software decoders.
PS. We do have cameras available for developers (
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the theora