Why this code shows error.?

http://speedy.sh/bmudH/9.png

This is the image which i am testing.. And code for it is..

I = imread('9.png');

threshold = graythresh(I);

originalImage = im2bw(I, threshold);

i = bwareaopen(originalImage,350);

imshow(i)

m = max(max(i));

[r c] = find(i == m);

fid = fopen('lalit1.txt','wt');

for j=1:length(r)

fprintf(fid,'%f %f\n',r(j),c(j));

end

fclose(fid);

data = textread('lalit1.txt');

r = unique(data);

for i=r',

    c = data(data(:,2)==i,1);

    z(i,1) = mean([min(c) max(c)]);

end

fid = fopen('lalit2.txt','wt');

for j=1:length(z)

fprintf(fid,'%f %f\n',j,z(j));

end

fclose(fid);

clc;

clear;

fileID = fopen('lalit2.txt');

C = textscan(fileID, '%f32 %f32');

fclose(fileID);

y=cell2mat(C(:,1));

x=cell2mat(C(:,2));

nz = x ~= 0;

y = y(nz);

x = x(nz);

binaryImage = logical(accumarray( ceil([x(:), y(:)]), 1, [480 752]) );

imshow(binaryImage)

Why this program shows error for this attached image.?

Please give me correction..

What error does it show, on which line?

When i am running at this,

for i=r',

    c = data(data(:,2)==i,1);

    z(i,1) = mean([min(c) max(c)]);

end

It shows an error,

??? Subscripted assignment dimension mismatch.

Use the command

dbstop if error

and run until the error occurs. When it does, ask

size(data)
size(c)
size(i)

and show them to us.

I can't understand in program where this has to be added..! So, please give it to me by adding in program..

At the MATLAB command line, type in the command

dbstop if error

Do not put this in your source code, just type it in at the command line.

Then execute your program as normal.

Eventually the program will stop in the debugger at the point you are having the problem. When that happens, at the command line prompt, type in the three commands

size(data)
size(c)
size(i)

Do not put them all on one line; use three separate lines.

Show us the output of those three commands.

I asked you repeatedly to format code in your questions properly. You did this successfully already, but stop this unfortunately again.

• One empty line before the code
• one empty line after the code
• marker the code
• hit "{} Code" button

It is not hard, but friendly for the readers.

size(data)

ans = 19986 2

...............

>> size(c)

ans = 0 1

...............

>> size(i)

ans = 1 1

Answer 1

What do you think this code does on a binary image (badly named "i"):

m = max(max(i));
[r c] = find(i == m);

Yep, m is one, so it's the same as

[r c] = find(i);

Then you write all pixel locations to a file for some unknown reason. Then you read it all back in with this

data = textread('lalit1.txt');
r = unique(data);

but now r has unique values from all the rows and columns combined, which makes little sense. Then it continues to get crazier from then on. What are you trying to do? Whatever it is, I'm sure this is not the best way of doing it. I don't really understand what the for,c,z loop is supposed to do and why you're messing around with cell arrays, accumarray(), etc. Perhaps it's due to the lack of comments. But anyway, I'm sure there is a much easier way, if I just knew what you were trying to accomplish. Posting an image would help.

I have This original image

http://speedy.sh/dvQ99/1.png

.......................

And after running my above code i got this kind of image Whuch i want..

http://speedy.sh/9B5hh/1st.jpg

.........................

The same thing i want to do for this image,

http://speedy.sh/bmnHH/9.png

But this code shows this kind of error,

??? Subscripted assignment dimension mismatch.

Answer 2

Nothing matches the equality test, so "c" becomes empty. The min and max of that are empty, the mean of emptiness is empty, and you then try to store that emptiness in a single array location. But a single array location is too big to store emptiness so you get the error.