From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266310AbUH1DMa (ORCPT ); Fri, 27 Aug 2004 23:12:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268149AbUH1DMa (ORCPT ); Fri, 27 Aug 2004 23:12:30 -0400 Received: from ntmail.xtreamlok.com ([203.20.243.135]:20005 "EHLO ntmail.xtreamlok.com") by vger.kernel.org with ESMTP id S266310AbUH1DM2 (ORCPT ); Fri, 27 Aug 2004 23:12:28 -0400 Message-ID: <412FF888.8090307@biodome.org> Date: Sat, 28 Aug 2004 13:14:16 +1000 From: QuantumG User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.1) Gecko/20040707 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Craig Milo Rogers CC: linux-kernel@vger.kernel.org Subject: Re: reverse engineering pwcx References: <412FD751.9070604@biodome.org> <20040828012055.GL24018@isi.edu> <20040828014931.GM24018@isi.edu> In-Reply-To: <20040828014931.GM24018@isi.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 28 Aug 2004 03:14:19.0066 (UTC) FILETIME=[1B6E49A0:01C48CAD] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Craig Milo Rogers wrote: > Hmmm... a poster on Slashdot claims that entropy measurements >imply that the pwcx code is interpolating rather that truly >decompressing. Again, that's integer math and table lookups. > > http://www.amazon.com/exec/obidos/tg/detail/-/B00005R098/102-7619892-0201738?v=glance claims that the Logitech Quickcam Pro 3000 is a "True 640 x 480 resolution video capture" which is now clearly false. It would appear I have found an answer to my question. The reason Philips made Nemosoft sign an NDA was not to hide proprietory information from their competitors. It was to hide the fact that they were misrepresenting the resolution of their cameras to their customers. No wonder Nemosoft did not feel right about opening this module even after the NDA expired, he would be telling the world their dirty little secret. Of course I'm sure this was common knowledge to all those people who work in robotics and always demand an uncompressed stream from the camera. Trent Waddington Decompiler maintainer, http://boomerang.sourceforge.net/