Change element of a matrix in a row

Hello community,

I am using matlab for image processing. I filter the image and get a black-white image and after that i want to count them. I finished that. The problem is that in the Matrix there are white places. For better understanding i gave you an example.

A

0 0 0 0 0

1 0 1 0 0

0 1 0 0 1

1 1 1 1 0

1 0 0 0 1

the result should be

A

0 0 0 0 0

1 1 1 0 0

0 1 1 1 1

1 1 1 1 0

1 1 1 1 1

I can't code it so please i need your help. I hope you can help me.

Thanks!

[Jan]

Please explain the procedure: Do you want to the rows to be filled by 1s between the first and the lase 1?

[Selim Karakurt]

JES! I tried to give an example. But KSSV answer was good but it dont work because i have to change my logical matrix in to a double matrix. but when i do so my double matrix is filled with only 1 and i loose my information. you can look down what i talked with him. Thanks!

Answer 1

[KSSV]

A = [0 0 0 0 0

1 0 1 0 0

0 1 0 0 1

1 1 1 1 0

1 0 0 0 1 ] ;

B = A ;
[m,n] = size(A) ;
for i = 1:m
    idx = find(A(i,:)==1) ;
    if ~isempty(idx)
        B(i,idx(1):idx(end)) = 1 ;
    end
end
B

[Selim Karakurt]

Hey KSSV,

thank you for your fast answer. Unfortunately it doesn't work. I convert the image in to a binary one to get a only logical matrix with im2bw. But unfortunaltey it doesnt change anything. I plot A and B but they are the same. Btw when I run it with the simple example matrix i gave above it works.

[KSSV]

It will work with any matrix. The class of matrix shall be double.

[Selim Karakurt]

I changed the matrix into double but when i do so all elements are changed into 1 and so I lose my informations.

[KSSV]

Attach your image...

[Selim Karakurt]

for example something like this. all i want is to fill the picture with black.

[Selim Karakurt]

Nobody there to help me?

Answer 2

[Thorsten]

help imfill