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From: "Keith Buck"
Subject: Re: Detecting colored objects
Date: Tue, 29 Oct 2002 22:48:17 -0000
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Tue, 29 Oct 2002 22:44:25 +0000
Its fairly simple. You need some coloured matt cards of the exact colours
you wish to detect. You can then get a sensitive photomultiplier and lens to
look at the object against one of the coloured backgrounds. The pohoto
multiplier will not "see" anything that is the same colour and brightness as
Regards Keith Buck
wrote in message
> I am not clear on where the 11 colors come from. Are we talking about the
> white-tan-brown dimension of ordinary eggs, or something more subtle?
> Color as seen by humans has 3 dimensions: Red, Green, and Blue, or
> Hue, Saturation and Value, or some other system. Has somebody
> documented for you what the 11 colors are? If not, you need the
> temporary use of some equipment such as a spectrophotometer or
> colorimeter to clarify the problem.
> Jim W.
> Harry Dellamano wrote:
> > I would like to candle eggs that have 11 possible solid colors rolling
> > an assembly line. Once the color is determined a microprocessor will
> > them into the correct bin. I do not know the best way to detect color on
> > fly. It would be nice if a photocell would put out different current
> > that can be calibrated and detected by a threshold detector. Once I get
> > the light to electronic transducer I am home free. What is the best
> > detector and light source for this job??
> > thanks
> > harry
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