Xref: utzoo rec.aviation:7102 comp.graphics:2432
Path: utzoo!mnetor!uunet!husc6!think!ames!oliveb!pyramid!prls!philabs!bebop!sxm
From: sxm@philabs.Philips.Com (Sandeep Mehta)
Newsgroups: rec.aviation,comp.graphics
Subject: Re: JAL 747 crash film
Message-ID: <3533@briar.Philips.Com>
Date: 6 May 88 11:50:37 GMT
References: <7237@mhuxd.UUCP>
Sender: news@philabs.Philips.Com
Reply-To: sxm@bebop.UUCP (Sandeep Mehta)
Organization: Philips Laboratories, Briarcliff Manor, NY
Lines: 22

In article <7237@mhuxd.UUCP> wolit@mhuxd.UUCP (Jan Wolitzky) writes:
> ...
>depicted external damage to the	plane visible before the
>crash, information gleaned from	a computer-enhanced snapshot
>of the plane (taken by someone on the ground along the route
>of flight, as he noticed the plane flying erratically),
>which determined that some 60% of the plane's vertical tail
>had been blown away when the aft pressure bulkhead failed.

The animation was certainly impressive, but the image processing
techniques were quite normal. The took the image, zoomed into tail section
(region of interest); and since the image was very blurred, ran a contrast 
enhancement algorithm on it. Then the edge was extracted and the contour 
plotted. The same was repeated for a complete tail section, and the two plots 
overlaid to determine the percent of the tail section destroyed.
I found the terrain and dutch roll simulation very realistic and impressive.

sandeep
--
Sandeep Mehta                                                  (914)-945-6478
Robotics & Flexible Automation                        uunet!philabs!bebop!sxm	
Philips Laboratories                                  sxm@philabs.philips.com