Steve on Image Processing with MATLAB

Image processing concepts, algorithms, and MATLAB

How to use IMSPLIT to split a color image into component images

저자Steve Eddins,

96 회 조회 (최근 30일) |좋아요|0 댓글
Today I want to show you a handy little function, imsplit , for splitting color images into their components.
Also, for no reason other than WOW , I want to show one of the images just released by the James Webb Space Telescope program ( home page , flickr galleries ).
url ="https://live.staticflickr.com/65535/52211883534_7fe30b9955_o_d.png";
rgb = imread(url);
imshow(rgb)
text(size(rgb,2),size(rgb,1),"Image credits: NASA, ESA, CSA, and STScl",...
VerticalAlignment ="top",...
HorizontalAlignment ="right")
Anyway, back to imsplit . Long-time readers have seen me use code like this to split up color images (sometimes RGB, sometimes $ L^* a^* b^* $ ) into component images:
L = lab(:,:,1);
a = lab(:,:,2);
b = lab(:,:,3);
见,例如,关于二维的histograms ( 23-Dec-2010 ) and segmenting images in $ (a^*,b^*) $ space ( 04-Feb-2011 ).
That code is not hard to write, but now I've become fond of using imsplit instead, just because it is a bit more compact, without sacrificing understandability. The function imsplit , introduced in release R2018b, is used this way:
url ="https://blogs.mathworks.com/images/steve/2010/mms.jpg";
candy = imread(url);
lab = rgb2lab(candy);
[L,a,b] = imsplit(lab);
tiledlayout("flow")
nexttile
imshow(candy)
nexttile
imshow(L,[0 100])
title("L")
nexttile
imshow(a,[-90 90])
title("a")
nexttile
imshow(b,[-90 90])
title("b")
That's it, really. There's nothing more to it. Give it a try the next time you need to do this; it'll save you 2.7183 seconds.
Before I go, let's look at that Webb telescope image one more time, just because.
[R,G,B] = imsplit(rgb);
tiledlayout("flow")
nexttile
imshow(rgb)
nexttile
imshow(R)
title("R")
nexttile
imshow(G)
title("G")
nexttile
imshow(B)
title("B")
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