error : Index in position 3 exceeds array bounds (must not exceed 1).

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Akash Kuber 2019-7-2

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https://ww2.mathworks.cn/matlabcentral/answers/469858-error-index-in-position-3-exceeds-array-bounds-must-not-exceed-1

评论： Anu Sebastian 2021-3-9

please help

I=imread('AFTER.tif');
[R C] = find(I(:,:,1)<100 & I(:,:,2)>0.2 & I(:,:,3)>10);   error
imagesc(I)% a is the image
% rows and columns of area found by thresholding
n=randi([50 length(R)],1,300);%randomly generated indexes
r=R(n);c=C(n);% extraction of entries corresponding to randomly generated values in row and column vectors
for ii=1:length(n)
  subpatch=I(r(ii)-75:r(ii)+75,c(ii)-75:c(ii)+75);%for patches of size 151 by 151
  imwrite(subpatch,strcat('C:\Users\user\Documents\MATLAB\before\p',num2str(ii),'.tif') );
end

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Akash Kuber 2019-7-2

编辑：Stephen23 2019-7-2

在 MATLAB Online 中打开

this is the code it works not giving out rgb image but greyscale image

clc;clear all;close all
%samle 3D matrix, e.g. can be an RGB image
a=imread('BEFORE.tif') ;
size(i);
[R, C] = find(I(:,:,1)<1450);
imagesc(I)% a is the image
% rows and columns of area found by thresholding
n=randi([1 length(R)],1,300);%randomly generated indexes
r=R(n);c=C(n);% extraction of entries corresponding to randomly generated values in row and column vectors
for ii=1:length(n)
  subpatch=I(r(ii)-75:r(ii)+75,c(ii)-75:c(ii)+75);%for patches of size 151 by 151
  imwrite(subpatch,strcat('C:\Users\user\Documents\MATLAB\before\p',num2str(ii),'.tif') );
end

Jan 2019-7-2

Does this mean, that the problem is solved?

"i have jus added find(I >100);" - but we do not know where you have added this.

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回答（1 个）

Rajani Mishra 2019-7-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/469858-error-index-in-position-3-exceeds-array-bounds-must-not-exceed-1#answer_383761

编辑：Rajani Mishra 2019-7-18

在 MATLAB Online 中打开

Hi,

I understand that you are facing the error – ‘Index in position 3 exceeds array bounds (must not exceed 1)’ while trying to access matrix ‘I’ used to store an image file.

Error exceeding array bounds is caused when you try to access an element out of matrix dimensions.

So before trying to access indices of matrix ‘I’ check whether it’s a RGB image or a grayscale image

as in case of grayscale image you should not have – ‘ I(:,:,3) or I(:,:2) ’.

To check whether it’s a RGB or grayscale image try :