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For loop help, Matrix manipulation

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Derek
Derek 2011-5-11
Hello,
Here is the updated code from a quesion I asked yesterday. I was given a TIFF image, which I imported into Matlab. I then had to find every pixel value greater than 149. My next step was to locate groups of nine points that each had values >149 that were arranged in a 3x3 sub matrix, which I called "kernals". The next step, which I am stuck on, requires me to find the mean of each "kernal", and sort the means into four groups. My attempt is as follows,
imdata = imread('dayonefile.tiff'); % imported array
removed = imdata(1:2048,1:2048); % scale etc. removed
white = removed>149; %values greater than 149 are true, less are false
pixels=imagesc(white,[0 1]); colormap(gray);%colormap image black is less than 150
m=0; for ii=1:2048 for jj=1:2048 if (removed(ii,jj))>149 m=m+1; end end end %total number of pixels with value greater than 149
r=0;%number of "kernals"
t=0;%group one
u=0;%group two
v=0;%group three
w=0;%group four
for ii=2:2047
for jj=2:2047
if ((removed(ii-1:ii+1,jj-1:jj+1))>(149))
r=r+1; %total number of "kernals" (blocks of nine with values greater than 149)
if r>0
Mean(r)=mean2(removed(ii-1:ii+1,jj-1:jj+1)); %Gives the mean of each "Kernal"
if ((174)>(Mean(r))>=(150)); %attempt to sort means
t=t+1;
elseif ((199)>(Mean(r))>=(175));
u=u+1;
elseif ((229)>(Mean(r))>=(200));
v=v+1;
else ((255)>(Mean(r))>=(230));
w=w+1;
end
end
end
end
end
This is my first program, and after one day I’m feeling pretty good about it. Once I fix my sorting problem I will be able to submit (as you can imagine I am pretty eager). Thanks in advance for everyone’s help!
Derek

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回答（1 个）

Sean de Wolski
Sean de Wolski 2011-5-11
if (all(all(removed(ii-1:ii+1,jj-1:jj+1)))>(149)) %added all(all(..P)
if ((174)>(mean(r)) && mean(r) >=(150)); %two conditions + && required
repeat as necessary for other if statements.

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