How do I prevent my variable from being overwritten?

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vaishali
vaishali 2013-9-20
编辑： Ashish Uthama 2013-10-14
from binary image like white color banana and background is black .I divided this in three part 20% ,60% and 20%Middle 60% part is used to measure width of banana.I have rows and cols coordinates; for each col (within 60%area) want to find width
[rows, cols] = find(BW == 1);
n1=min(cols); n2=max(cols);
m1=min(rows); m2=max(rows);
column = n1:n2 ;
a=length(column);
b=a*0.2;
n11=round(n1+b);
n22=round(n2-b);
columns = n11:n22 ;
for ii=n11:(n22);
for j=m1:m2
[row1 col]=find(BW(:,ii)==1) ;
x2=max(row1);
x1=min(row1);
d=x2-x1;
end
d1(ii)=d;
end
P=d1;
Desired P should be of size 1 x (length(columns))

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Image Analyst
Image Analyst 2013-9-20
Your d is getting overwritten at each iteration of the j loop. You need to have d(j) instead of just d. But you actually don't even need it at all to find the first and last white pixel on a line. Just use find() with the 'first' and 'last' option:
for row = n11 : n22
x2 = find(BW(row,:), 1, 'last');
x1 = find(BW(row,:), 1, 'first');
d1(row) = x2 - x1;
end
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vaishali
vaishali 2013-9-23
sir, file is very useful for me. Thanks for helping me.

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