Code Troubleshooting for replacing pixels in original image and ending with "index exceeds matrix dimensions."
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Megan Wang
am 19 Jun. 2017
Kommentiert: Gopichandh Danala
am 20 Jun. 2017
My image size is 1600x1200 and I'm wondering why it keeps saying "index exceeds matrix dimensions." I want to fill the parts within the yellow triangle and red circles with gray. My image is attached.
I=imread('image2-1.jpg');
Ired=I(:,:,1);
imgray=rgb2gray(I);
BW1 = im2bw(Ired,0.9);
BW1=imfill(BW1,'holes');
figure,imshow(BW1);
c = 1;
I3 = zeros(1600, 1200);
while c <= 1600
d = 1;
while d <= 1200
I3(c, d) = BW1(c, d);
d = d+1;
if BW1(c,d)>0
I(c,d,1)=127;
I(c,d,2)=127;
I(c,d,3)=127;
end
end
c = c+1;
end
figure, imshow(I);
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Gopichandh Danala
am 20 Jun. 2017
I checked the attached image: It is not 1600 * 1200
>> I=imread('image2-1.jpg');
>> size(I)
ans =
385 513 3
I resized the image just in case if attaced image is wrong:
I = imresize(I, [1600 1200], 'bilinear');
>> size(I)
ans =
1600 1200 3
Your d-value in the while loop has to be at the end of the inner while loop:
while c <= 1600
d = 1;
while d <= 1200
I3(c, d) = BW1(c, d);
if BW1(c,d)>0
I(c,d,1)=127;
I(c,d,2)=127;
I(c,d,3)=127;
end
d = d+1;
end
c = c+1;
end
But I found few problems in the code..
>> max(BW1(:))
ans =
logical
0
so, there are no values in the BW1 so your ' if condition' is never true and 'I' values doesn't get updated.
check your code where you are computing BW1 where you are expecting to find the marked regions
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