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How to fix Index position 3 exceeds array bounds (must not exceed 1)

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Erza Naziha
Erza Naziha 2022-6-6
评论： KSSV 2022-6-10
I'm doing cropping and zero padding for bounding box images. However, there is error 'Index in position 3 exceeds array bounds (must not exceed 1).' I don't understand the error and location of 'index in position 3' . Hence, I can't solve it.
Please help me with this problem. Below are my codes.
%% Bounding box
imbwlabel=bwlabel(I8); %bwlabel works only in binary (b&w,double) image
figure;
imshow(label2rgb(imbwlabel)); %this is important bcs it helps to create the bounding box
%in colored (uint8,unit16 etc) image and not in binary (b&w) image
bboxes=regionprops(imbwlabel,'BoundingBox');
[L, n]=bwlabel(I8);
bboxes=regionprops(I8,'BoundingBox','Centroid');
figure;imshow(I10);%title('Image with Bounding box');
axis image off
hold on
for k=1 : length(bboxes)
CurrBB=bboxes(k).BoundingBox;
% cent=cat(1,bboxes.BoundingBox);
% plot(cent(:,1),cent(:,2),'g*')
rectangle('Position', [CurrBB(1),CurrBB(2),CurrBB(3),CurrBB(4)], 'EdgeColor','m','LineWidth',2)
end
hold off
%% Crop image from bounding box
if ~isempty(bboxes)
for p=1:length(bboxes)
CurrBB=bboxes(p).BoundingBox;
obj = imcrop(I8,CurrBB);
[m, n, l]=size(obj);
if (m > 227 || n > 227)
obj=imresize(obj,[227 227]);
end
I12=zeros(227,227);
I12=uint8(I12);
for i=1:m-1
for j=1:n-1
for k=1:3
I12(i,j,k)=obj(i,j,k);
end
end
end
figure;imshow(I12);
% figure;imshow(obj);
imwrite(I12,sprintf('%dpad.png',p));
end
end

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采纳的回答

KSSV
KSSV 2022-6-6
编辑：KSSV 2022-6-6
Ran in:
This error is simple.. you are trying to extract more number of elements then present. I suspect, you have a black and white image and you are trying to consider it as RGB and tried to extarct extra index.
% Demo
I = rand(10,10,3) ; % 3D matrix
R = I(:,:,1) ; % no error
G = I(:,:,2) ; % no error
B = I(:,:,3) ; % no error
%
I = rand(10) ; % 2D matrix
I1 = I(:,:,1) ; % no error
I2 = I(:,:,2) ; % error, there is no second matrix
Index in position 3 exceeds array bounds. Index must not exceed 1.
In the same, way check the dimensions of the matrix, where you tried to extract like shown above.
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Erza Naziha
Erza Naziha 2022-6-10
hi again. Want to tell you that I've solved the problem already. Like you said, I'm expecting it to be RGB images but I accidently read the grayscale image. The error comes from this line
obj = imcrop(I8,CurrBB);
suppose to be I10 (RGB) instead I8(grayscale).
Thank so much for the hint!

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