Greetings Friends & Customers,
Due to high workload, I am currently checking and responding to e-mail twice daily at 12: 00 P.M. PST and 4: 00 P.M. PST.
For repair inquires and scheduling; a phone call is always a faster, more efficient option than e-mail.
If you require urgent assistance (please ensure it is urgent) that cannot wait until either 12: 00 P.M. or 4: 00 P.M., please contact me via phone at 503-919-1489.
Thank you for understanding this move to more efficiency and effectiveness. It helps me accomplish more to serve you better.
Sincerely,
Brian
iCracked Certified iTech
b.engelhard@itechs.com
work: 971-340-2239
cell: 503-919-1489
On Jul 19, 2016, at 1:39 PM, Mike Murray via OBRA wrote:
> Interesting article but like many of his articles it is not technically
> completely correct. For old film photo finish cameras he was correct, those
> had a slit aperture lens. Film was pulled past the slit aperture to create
> the image. Film photo finish cameras are really not around at all anymore.
> As a matter fact OBRA had a hold Olympus PhotoSprint which we ended up
> giving away for free as it had no market value and no one made film for it
> any longer. Modern photo finish cameras are digital. They use a regular lens
> but for image acquisition they use a line scanner like a photocopier or a
> fax machine. Basically what this does is create a very thin vertical image
> and then the software stacks all those vertical images next to each other to
> create the picture that you see, also similar to what a fax machine or
> photocopier does. Basically this picture is not a picture of anything that
> existed but it is a graph of the vertical space (the finish line) on the
> vertical access and time on the horizontal axis. By lining up the cursor on
> the computer screen you can find the time at which that thin image occurred.
> For both types of photo finish cameras things are moving faster appear
> narrower because they take a shorter time crossing the finish line. Things
> that are going slower appear wider for the opposite reason. Since the spokes
> at the top of the wheel are going twice as fast as the ones at the bottom
> they appear squeezed together at the top and spread out at the bottom.
> Actually when you think about it the bottom of the tire is instantaneously
> stationary at the time that the picture is taken so it will always be as
> wide as the individual image gathered by the line scanner.
>
> Mike Murray
>
>
> -----Original Message-----
> From: OBRA [mailto:obra-bounces@list.obra.org] On Behalf Of Nathan gibson
> via OBRA
> Sent: Tuesday, July 19, 2016 10:52
> To: obra@list.obra.org
> Subject: [OBRA Chat] How does a finish line camera work? Velonews-
>
> http://velonews.competitor.com/2016/07/bikes-and-tech/technical-faq-how-a-photo-finish-camera-works_415180
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