What does this error- ''Out of range subscript'' mean during using sub2ind?
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Hi! I am working with border irregularity. In my code I had to find out the diagonals of a box. In single code it works but when I used it along other code it shows this error message. I couldn't find the problem.My code is given below:
%read binary mask
mask = imread('image.bmp');
mask=mask(41:616,128:894,1)>128;
%fill all holes:
%flip mask and select everything that is not the outer area
mask= bwlabel(~mask,4) ~= 1;
%find the edge pixels with something like imerode
SE=true(3*ones(1,ndims(mask)));%structuring element
edge= mask & ~( mask & convn(mask,SE,'same')==sum(SE(:)) );
%find the bounding box with 1 px margin
colind_first=find(sum(mask,1),1,'first')-1;
colind_last =find(sum(mask,1),1,'last')+1;
rowind_first=find(sum(mask,2),1,'first')-1;
rowind_last =find(sum(mask,2),1,'last')+1;
box=false(size(mask));
box([rowind_first rowind_last], colind_first:colind_last )=true;
box( rowind_first:rowind_last ,[colind_first colind_last])=true;
%add the diagonal lines to the box
x=false(size(mask));
p=polyfit([rowind_first rowind_last],[colind_first colind_last],1);
row=rowind_first:rowind_last;
col=round(polyval(p,row));
x(sub2ind(size(x),row,col))=true;
%add other diagonal to x
p=polyfit([rowind_first rowind_last],[colind_last colind_first],1);
col=round(polyval(p,row));
x(sub2ind(size(x),row,col))=true;
In my main code I had to delete this line so I can't understand if it causes the problem:
mask=mask(41:616,128:894,1)>128;
where ''mask'' is the segmented image.The image is:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/316881/image.bmp)
11 Kommentare
KSSV
am 18 Jun. 2020
What exactly is your problem? You want diagonals of the bounding box of the irregular domain i.e white region in the image?
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