how can I use my function on 3*3 blocks?

1 view (last 30 days)
hi I have a matrix ,I wanna use a function on 3*3 blocks. my function is: if in a block we watch just a one this block should return 1 but if all 9 elements of this block is zero this function should return 0 how can I do this in matlab?
...all the elements of this matrix is zero and one.
  1 Comment
Image Analyst
Image Analyst on 9 Apr 2015
Give examples of the 3x3 blocks that return 1 and 0. I especially don't understand the grammar of "if in a block we watch just a one this block should return 1". Exactly what returns a 1? Does this:
[.2 .3 .4
.3. .5 .6
.6 .7 .9]
Does this?
[0 0 1
0 0 0
0 0 0]

Sign in to comment.

Accepted Answer

Mohammad Abouali
Mohammad Abouali on 10 Apr 2015
Edited: Mohammad Abouali on 10 Apr 2015
inputData=zeros(10,10);
inputData(randi(100,[15,1]))=1
inputData =
0 0 0 0 0 0 0 1 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1 1 0
0 0 0 0 0 0 1 1 0 0
0 0 0 0 0 0 0 0 0 0
0 1 1 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 0 0
1 0 0 1 0 0 0 0 0 0
% this is what you are looking for
result=blockproc(inputData,[3,3],@(block) any(block.data(:)~=0))
result =
0 0 1 0
1 0 1 1
1 0 1 0
1 1 0 0
% and if you want both inputData and result matrix be the same size do this:
result=blockproc(inputData,[3,3],@(block) any(block.data(:)~=0)*ones(3,3))
result =
0 0 0 0 0 0 1 1 1 0 0 0
0 0 0 0 0 0 1 1 1 0 0 0
0 0 0 0 0 0 1 1 1 0 0 0
1 1 1 0 0 0 1 1 1 1 1 1
1 1 1 0 0 0 1 1 1 1 1 1
1 1 1 0 0 0 1 1 1 1 1 1
1 1 1 0 0 0 1 1 1 0 0 0
1 1 1 0 0 0 1 1 1 0 0 0
1 1 1 0 0 0 1 1 1 0 0 0
1 1 1 1 1 1 0 0 0 0 0 0
1 1 1 1 1 1 0 0 0 0 0 0
1 1 1 1 1 1 0 0 0 0 0 0
  2 Comments
jack nn
jack nn on 10 Apr 2015
dear Mohammad Abouali ,I really appreciate you for your help.

Sign in to comment.

More Answers (1)

Roger Stafford
Roger Stafford on 10 Apr 2015
m = M(a:a+2,b:b+2); % This is your "block"
t = +any(m(:)~=0); % This is the returned value

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!