Re: Mast B Bicycle Attorney rider

Mike Murray

October 30, 2006 at 8:52 AM

Actually the image is considerably more narrow than 1 cm. The width of the
subject in each frame depends on the lens and the distance from the camera.
The system scans up to 2000 lines each second. These vertical lines are
then assembled into a picture. This picture is not really a picture of
anything that really existed but is actually a graph with the horizontal
representing time and the vertical being what was on the line at that time.
Things that are moving fast appear more narrow and things that move slow are
wider. Since the spokes at the top of the wheel are going twice as fast as
the ones at the bottom relative to a stationary observer they get squeezed
together at the top and stretched apart at the bottom. This causes them to
look bent. Trispokes look even sillier.

Mike Murray

-----Original Message-----
From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of Jesse J. Finch Gnehm
Sent: Monday, October 30, 2006 15:28 PM
To: obra@list.obra.org
Subject: Re: [OBRA Chat] Mast B Bicycle Attorney rider

I believe they look that way because the finish line camera only records
a 1cm picture and the image is the composite of the person crossing the
line. As a result, the spokes change position in each part (frame) of
the image as the rider rolls across the line.

Eric Kytola wrote:
> what kind of spokes are those.....al dente?
>
> -----Original Message-----
> From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org]
> On Behalf Of Candi Murray
> Sent: Monday, October 30, 2006 1:55 PM
> To: obra@list.obra.org
> Subject: [OBRA Chat] Mast B Bicycle Attorney rider
>
> Anyone know who this is?
>
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--
Jesse J. Finch Gnehm '99
Director of Parent Giving
Willamette University
503-375-5319

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