can any one tell me how to extract only the l component of the image ..if the image is rgb ..i want only the l component of the image ,how is it possible

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ashok
ashok 2014-2-10
编辑： Dishant Arora 2014-2-10
can any one tell me how to extract only the l component of the image ..if the image is rgb ..i want only the l component of the image ,how is it possible

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回答（2 个）

Dishant Arora
Dishant Arora 2014-2-10
R=YourImage(:,:,1);
G=YourImage(:,:,2);
B=YourImage(:,:,3);
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Thomas Seers
Thomas Seers 2014-2-10
If so convert to grayscale:
gray = rgb2gray(im); % with image processing toolbox
GIm=0.2989*im(:,:,1)+0.5870*im(:,:,2)+0.1140*im(:,:,3); % without
There are other methods posted here: http://www.johndcook.com/blog/2009/08/24/algorithms-convert-color-grayscale/
Dishant Arora
Dishant Arora 2014-2-10
编辑：Dishant Arora 2014-2-10
you need intensity component?? To get the intensity notion you can take mean of the three components as it happens in HSI model:
I=1/3*(R+G+B);
also you can follow YCbCr model to get intensity:
Y = 0.2126*R + 0.7152*G + 0.0722*B
where Y denotes luminosity.

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Thomas Seers
Thomas Seers 2014-2-10
Lets say you have a three channel RGB image, im.
% extract the red channel
red = im(:,:,1);
% extract the green channel
green = im(:,:,2);
% extract the blue channel
blue = im(:,:,3);
Simples!

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