Re: Videopoint & add-ons

[George Spagna <gspagna@rmc.edu>]

At 04:54 PM 3/18/97 -0600, you wrote:
> > Some students of mine were analyzing a video clip using Videopoint, and none
> > of their numbers made any sense.  The data table for an object clearly
> > moving steadily from left to right would yield numbers which increased and
> > decreased, sometimes even going negative.  
> George,
>        Sorry for the delay but I don't see an answer to your query, so I
> will try. If I remember correctly one of the special options in Videopoint
> is that it will allow you to pan with the camera and still digitize in the
> "inertial" reference frame. It sounds like your students got this feature
> turned on. One of the common trouble with "special features." Actually you
> can shoot a ball from a moving cart and look at the ball both from the
> stationary observer's reference frame and the frame co-moving with the cart
> which is a neat analysis.

Thanks for your response  -  I thought of that one, but it turned out not to
be the case.  In fact, VP was also unable to read the time stamp on the
video clips, so not only were adjacent pixels not consistently interpreted,
but objects appeared to move back and forth in time!


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