I made this object a while ago to track red and blue, but it can be extended to track other pure colors:<div><br></div><div><a href="http://www.jaimeoliver.pe/archives/645">http://www.jaimeoliver.pe/archives/645</a></div><div>
<br></div><div>best,</div><div><br></div><div>J<br><br><div class="gmail_quote">On Sun, May 23, 2010 at 1:00 PM, Mathieu Bouchard <span dir="ltr"><<a href="mailto:matju@artengine.ca" target="_blank">matju@artengine.ca</a>></span> wrote:<br>
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<div>On Sat, 22 May 2010, Ryan Trigg wrote:<br>
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I am currently trying to find a way to isolate a colour in a live video stream. For example, if I chose red, any object in the video that does not contain red (above a certain threshold) would be black. Does such an object exist in GEM? Thanks for your help.<br>
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[pix_colormatrix] is very good for that stuff. Optionally you can combine it with [pix_threshold] or others.<br>
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[pix_colormatrix] allows you, for example, to do things like new_red = old_red - old_green - old_blue, in order to identify redness in a way that excludes yellow, purple and white. You'd make a column with constants 1, -1, -1.<br>
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For singling out other colors you would use those numbers in a different order, or the numbers 1, 1, -2 in any order (for secondary colors), or any other combination (for finding other colors).<br><font color="#888888">
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<br></blockquote></div><br><br clear="all"><br>-- <br>Jaime E Oliver LR<br><br><a href="http://www.jaimeoliver.pe" target="_blank">www.jaimeoliver.pe</a><br><br>858 750 0924 (cel)<br>858 202 1522 (home)<br>9168 Regents Rd. Apt. G<br>
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