Accessing elements of a block

Question

Monisha 2012-6-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/42066-accessing-elements-of-a-block

Please help me soon with this! Thanks a ton!

I need to divide an image of size 72x72 into 64 blocks of size 9x9 each. Then, I need to perform some sort of processing on each block by accessing each value within each block. Should I use blockproc or mat2cell? How do I access each element within a block? If I use blockproc, how do I use the third parameter to create my own function that will be called for each block?

The following code threw this error

??? Cell contents reference from a non-cell array object.

Error in ==> module2 at 21 x=myCell{1,1}{j,k};

[final_img]=module1;
myCell = mat2cell(final_img,[9 9 9 9 9 9 9 9], [9 9 9 9 9 9 9 9]);
% C={myCell};
y=1;    %initial previous value
w=1;
o=1;    %o-output vector index
p=1;
rx = zeros(64,1);
ry = zeros(64,1);
rx(1)=0;
ry(1)=0;
for i=1:8
    for l=1:8
        [m,n]=size(myCell{1,1}); %m-rows n-column m=n=9
              for j=1:m        
                  for k=1:n
                      x=myCell{1,1}{j,k};
                      z=myCell{1,1}{k,j};
                          if x~=y %compare with previous value
                              rx(o)=rx(o)+1; %horizontalcount++ 
                          end
                          if z~=w
                              ry(p)=ry(p)+1; %verticalcount++
                          end
                      y=x;
                      w=z;
                  end
              end
      end
    o=o+1;
    p=p+1;
  end

So, how do I get the value of x and z?

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Answer 1

Walter Roberson 2012-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/42066-accessing-elements-of-a-block#answer_51811

在 MATLAB Online 中打开

All of your myCell{1,1} should instead be myCell{i,l} and the indexing after that should be in () instead of in {}

myCell{i,l}(j,k)

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Walter Roberson 2012-6-26

Your "y" and "w" do not change at all, so you are not comparing against the "previous" values, only against fixed values.

Monisha 2012-6-26

wait! wait! I think I found the error...

the incrementing of the variables o and p have been put in the wrong place! It works now!

So the code looks like this now. Are you sure abt the y and w not changing on each iteration?

[final_img]=module1;

myCell = mat2cell(final_img,[9 9 9 9 9 9 9 9], [9 9 9 9 9 9 9 9]);

y=1; %initial previous value

w=1;

o=1; %o-output vector index

p=1;

rx = zeros(64,1);

ry = zeros(64,1);

rx(1)=0;

ry(1)=0;

for i=1:8

for l=1:8

[m,n]=size(myCell{i,l}); %m-rows n-column m=n=9

for j=1:m

for k=1:n

x=myCell{i,l}(j,k);

z=myCell{i,l}(k,j);

if x~=y %compare with previous value

rx(o)=rx(o)+1; %horizontalcount++

end

if z~=w

ry(p)=ry(p)+1; %verticalcount++

end

y=x;

w=z;

end

o=o+1;

p=p+1;

end

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Accessing elements of a block

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Accessing elements of a block

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