the most suitable technique of color detection

hello guys...

im doing a research on image processing to find the most suitable technique to get the range of red color... as i do not have any background on image processing please tell me what are different techniques of color detection? please some body help me thank you

Answer 1

[Walter Roberson]

The first thing you have to do is to define what "red color" means in precise terms. For example, exactly when does a color stop being red and start being purple, or orange, or black ?

[shima]

thanks Walter.. This is one of the problems i'm facing. Is there a way to determine the ranges of red color?

[Walter Roberson]

The only color names that have an objective scientific basis are "black" and "white" -- and "white" is most commonly not used in its scientific meaning.

You could _define_ Red, Green, and Blue in terms the peak sensitivities of the human eye, 575 nm, 535 nm, 445 nm respectively. Unfortunately that will not come close to matching the frequencies that we associate with those color names, at _about_ 660 nm, 520 nm, and 475 nm according to the diagram at http://hyperphysics.phy-astr.gsu.edu/hbase/vision/colcon.html#c1

Or you could use one of the standards of color definition such as CIE. Look at the bottom diagram in the below page: http://hyperphysics.phy-astr.gsu.edu/hbase/vision/cie.html

Please, however, read the text that accompanies that diagram, as it makes clear that color names *must* be approximate and not scientific.