Subject:
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Re: Color images? (was: Re: digital camera entirely made of mindstorms?)
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 28 Sep 2000 09:12:41 GMT
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Original-From:
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Andy Gombos <GOMBOS_2000@spamcakeYAHOO.COM>
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Viewed:
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1466 times
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First you would need to find a light sensor that detects visible light, not mostly
infared light. What type of sensor is this?
Andy
Amnon Silverstein wrote:
> I tried this a little when I first made my robot using the red bat wings that
> come with the set, and I couldn't get a good image through one of them. One of
> the big problems is that the sensor is mostly infrared, with some red
> sensitivity. I haven't measured it, but I don't think it can see green or blue
> very well. Using real photo filters would work better than Lego parts, but the
> image distortion wouldn't be too much of a problem, since you could place the
> colored part directly over the light sensor.
> You could print out filters on transparancy stock with an inkjet and try it.
> The colors of Cyan Magenta and Yellow would let more light through than Red
> Green Blue. CMY filters will produce a very noisy color signal, but it might
> be detectable.
> In lugnet.robotics, David C. Pyatt writes:
> > In theory, yes I believe it could be done, however I would be concerned that a
> > 1x2 filter would be so thick as to distort the image drastically... better to
> > take a sheet of transparency material and print a red, green and blue spot and
> > attach it possibly to a wheel/pulley (sorry I'm at work and not in full Lego
> > mode) the 6 holed variety and rotate it with a rotation sensor to lock in the
> > correct positioning.... ?
> >
> > I had an article on how to due color scanning with a BW hand scanner that was
> > a multipass using filters... I think rotating the filters in and having the
> > exact lens positioning would work much better.
> >
> > DaveP
> >
> > In lugnet.robotics, David Eaton writes:
> > > In lugnet.robotics, David Eaton writes:
> > > > Ok, maybe I'm just out in left field on this one, or maybe someone will
> > > > actually be inspired to try it out... How about making a color digital • camera?
> > > >
> > > > Proposal: modify the existing design for the camera by adding on a colored
> > > > filter, and an extra motor. Bascially, create a wheel at the end of the lens
> > > > which had trans-red, trans-green, and trans-blue pieces. For each pixel that
> > > > the camera takes, cycle the filter for R, G, & B values. You'd have to tweak
> > > > the results a lot, but could it be done?
> > > >
> > > > DaveE
> > >
> > > Ok, so it's uncouth to reply to my own messages, but more on the color
> > > blending:
> > >
> > > -each filter could be 2 1x2 trans bricks-- the red filter would be green &
> > > blue, green would be red & blue, blue would be red & green
> > > -you'd also have a 4th filter (a hole) for a baseline gamma value. Hence, you
> > > could determine how much additional gamma you'd need to add for weighting the
> > > filtered values. So if you got an RGB of 10,30,20 (all out of 100, not 255) • and
> > > a gamma of 80 (out of 100), you could bump up the RGB to something like
> > > 20,40,30 (well, ok, you'd have to figure out the percentages, but that's just
> > > for example)
> > >
> > > DaveE
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