PSN-L Email List Message

Subject: Re: Seismic Sensors
From: Mark Robinson mark.robinson@...............
Date: Wed, 27 Mar 2013 11:47:43 +1300

On 26/03/13 23:56, Geoff wrote:
> I like the idea of using a WEBcam or something to look at the red dot
> then use a custom program to read the video and turn the graphic data
> into rectangular coordinates of a standard four quadrant graph
> with the point resting in the center of the graph
> But to do this in near real time may not be possible for myself to do.
> The max rate will be like 30Hz to 60Hz which is a video frame rate.
> Video is usually encoded and needs to be uncompressed.
> Uncompressing video takes lots of time to do so like a
> series of BMP captures at whatever rate would be the thing to do.
> You would take screenies at like 30 per second in a modulo fashion
> then save all after an alarm and the series of like
> 108000 BMP images would be decoded into a series of (X,Y) coordinates ??

This sounds a bit like a modified optical mouse.


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