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RGB layers separation for RAW or TIF image

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Yassine Zaafouri
Yassine Zaafouri 2016-10-11
评论： Guillaume 2016-10-12
Hi everyone , I have a raw Image taken from a camera ( unit16 ), i want te separate the RGB layers and i know that i have twice as many green pixels as red or blue pixels so i will get 2 green layers . I thought to convert it to tif Image first . i do not know if it is a good idea .
Can anyone help me to separate each layer please ?
thank you

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回答（1 个）

Guillaume
Guillaume 2016-10-11
编辑：Guillaume 2016-10-11
The demosaic function is what you need to convert you Bayer pattern into an RGB image. You need to know of course which pattern your sensor use (one of 'gbrg', 'grbg', 'bggr' or 'rggb').
You will not get two green layers since otherwise it's not a valid RGB image.
The way an image is stored on file (eg. tif or png) is completely independent from the way it is stored in memory (eg. RGB). As far as I know the tif format does not know anything about bayer patterns. Decoding the pattern would be required before you could even save your image as tif.
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Yassine Zaafouri
Yassine Zaafouri 2016-10-12
if true
test1=imread('.\xyz.tif')
J = demosaic(test1,'grbg');
imwrite(uint16(J),'abc.tif')
test01=double(imread('.\abc.tif'))
end
and then i want to extract from test01 each channel and represent it as a matrix .
Guillaume
Guillaume 2016-10-12
If you're talking about colour channels, they are already represented as matrices. They're the pages (3rd dimension) of your image matrix:
yourimage(:, :, 1) is the red channel
yourimage(:, :, 2) is the green channel
yourimage(:, :, 3) is the blue channel
You need to learn how images are represented in matlab

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