From: Albert Cahalan <albert@users.sf.net>
To: Lee Revell <rlrevell@joe-job.com>
Cc: linux-kernel mailing list <linux-kernel@vger.kernel.org>,
clemtaylor@comcast.net, qg@biodome.org, rogers@isi.edu
Subject: Re: reverse engineering pwcx
Date: 28 Aug 2004 12:56:16 -0400 [thread overview]
Message-ID: <1093712176.431.6806.camel@cube> (raw)
In-Reply-To: <1093710358.8611.22.camel@krustophenia.net>
On Sat, 2004-08-28 at 12:25, Lee Revell wrote:
> On Sat, 2004-08-28 at 12:17, Albert Cahalan wrote:
>> [somebody]
> > > The LavaRnd guys examined the pixels on the actual
> > > CCD chip. It's 160x120. The 'decompression' is
> > > just interpolation.
> >
> > Don't put much faith in the 160x120 number. Suppose
> > that the chip is in a Bayer pattern, with 160x120
> > of those. Well, how many pixels is that? Who knows.
> > You'd sort of have 160x120, but with double the
> > green data. Since green carries most of the luminance
> > information, producing a larger image is reasonable.
>
> Right, as someone else pointed out, this is wrong.
>
> How do you account for the Slashdot poster's assertion that it's
> physically impossible to cram 640 x 480 worth of data down a USB 1.1
> pipe?
640x480 uncompressed 24-bit RGB? It doesn't matter.
The suggestion of a 4x4 JPEG-like transform seems
pretty reasonable. I'd like to see that whitepaper.
next prev parent reply other threads:[~2004-08-28 16:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-28 16:17 reverse engineering pwcx Albert Cahalan
2004-08-28 16:25 ` Lee Revell
2004-08-28 16:56 ` Albert Cahalan [this message]
2004-08-28 17:11 ` Lee Revell
2004-08-28 18:05 ` Vojtech Pavlik
2004-08-28 17:53 ` Joel Jaeggli
2004-08-28 18:04 ` Lee Revell
2004-08-28 18:08 ` Lee Revell
2004-08-29 21:04 ` Helge Hafting
2004-08-30 7:42 ` Paul Jakma
2004-08-30 12:52 ` Albert Cahalan
2004-08-30 20:23 ` dulle
-- strict thread matches above, loose matches on Subject: below --
2004-08-28 0:52 QuantumG
[not found] ` <20040828012055.GL24018@isi.edu>
[not found] ` <20040828014931.GM24018@isi.edu>
2004-08-28 3:14 ` QuantumG
2004-08-28 3:35 ` Craig Milo Rogers
2004-08-28 3:49 ` Lee Revell
2004-08-28 12:23 ` Vojtech Pavlik
2004-08-28 19:20 ` Chris Meadors
2004-08-28 3:57 ` QuantumG
2004-08-28 12:07 ` Vojtech Pavlik
2004-08-28 6:47 ` Clem Taylor
2004-08-28 12:23 ` Wouter Van Hemel
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