How Can I Convert An Image To Octachrome In Opencv?

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I was studying about hand gesture recognition and i stumbled upon this article.http://www.cse.iitb.ac.in/~aamod/glive/itsp.html[^]

I couldn't understand this particular line and i have no clue how to implement this in opencv. This is the line - " Then this image is converted to octachrome(8 colours only - red, blue, green, cyan, magenta, yellow, white, black). This makes most of the pixels neutral or grey". I looked in opencv for a function such that i can convert my image to octa-chrome but i couldn't find any such function. Can anyone please suggest me how i can possibly convert an image to octa-chrome format?

Posted 6-Dec-14 1:32am

Surajit Das

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KarstenK · Answer 1 · 2014-12-06T07:12:00

you must write a conversion function, which has as input the old color and returns the new color. Run this function on every pixel of the image.

pseudo code:

Picture pic1; //loaded
Picture pic2;//created with targeted colors und size

for( int x=0; x<ypic1.width();x++)> for( int y=0; xy<pic1.heigth();y++)>  Color clr1 = pic1.getColor(x,y);//from pic1
  Color clr2 = myConversion(clr1);//here you decide the new color
  pic2.setPixel(x,y,clr2);//in pic2
 }
}