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why this gives me "Index exceeds matrix dimensions?" can any one help me. Thanks in advance

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Surya Gnyawali
Surya Gnyawali 2016-10-5
关闭： MATLAB Answer Bot 2021-8-20
figure
img = imshow(stretched_CIR);
title('CIR after Decorrelation Stretch');
h = imfreehand;
m = createMask(h, img);
delete(h)
% Extract individual color channels
r = img(:,:,1);
g = img(:,:,2);
b = img(:,:,3);
%Now I evaluate for RGB color channels;
>> r = img(:,:,1);
%works but
>> g = img(:,:,2);
Index exceeds matrix dimensions.
%why?

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回答（3 个）

Matthew Eicholtz
Matthew Eicholtz 2016-10-5
Are you sure the image is RGB instead of grayscale? As the error suggests, the variable img must not have a 2 layer in the 3rd dimension.
Surya Gnyawali
Surya Gnyawali 2016-10-5
The image is attached. Please advise
Guillaume
Guillaume 2016-10-5
The problem is with
img = imshow('...')
As per the documentation of imshow, its return value is a handle to a graphics object, not an image. You need to load the image properly with imread:
img = imread(stretched_CIR);
%and if you want to see the image
imshow(img);

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