RGB to opponent color space code

HI ALL,

Did any one guide me to find function for RGB to opponent color space that mentioned in the attached paper and link to paper RGB to opponent color space code : to

Answer 1

[Anand]

From what I can tell, this should do it:

%load RGB image
im = im2double(imread('peppers.png'));

%extract each channel
R  = im(:,:,1);
G  = im(:,:,2);
B  = im(:,:,3);

%convert to opponent space
O1 = (R-G)./sqrt(2);
O2 = (R+G-2*B)./sqrt(6);
O3 = (R+G+B)./sqrt(3);

[hamed abdulaziz]

Thank you very much,please could you provide me the paper or web site that you used for coding that converting,for I used it as a reference?

[hamed abdulaziz]

I used the code but I get this error

Error: File: RGB_to_oppent.m Line: 9 Column: 12 Unexpected MATLAB expression. at this line

O2 = (R+G-2B)./sqrt(6);

[hamed abdulaziz]

Then,I tried this correction

O2 = (R+G-2.*B)./sqrt(6);

is that correct?

[Anand]

Yes, thats right.

[hamed abdulaziz]

Thank you very much,please could you provide me the paper or web site that you used for coding the RGB to opponent color space?

[hamed abdulaziz]

MR. Anand:I am waiting your answer,thank you.

Answer 2

[Image Analyst]

All that is not built into MATLAB, but MATLAB includes the lower level functions for you to build that capability yourself , particularly in the Image Processing Toolbox and the Computer Vision System Toolbox.

http://matlab.wikia.com/wiki/FAQ#Can_you_program_up_the_algorithm_in_this_article_for_me_and_explain_it_to_me.3F

Answer 3

[Image Analyst]

There are lots of color spaces you could use. Here are formulas for some of them: http://www.easyrgb.com/index.php?X=MATH

Answer 4

[hamed abdulaziz]

THANKS, I FOUND THIS EQUATION IN THIS LECTURE,PLEASE COULD YOU GUIDE ME TO CODE THEM

AND THIS LECTURE