I want to do the same action to every files(.png) in one folder, but I face some problem.

I want to put 1092 files(109 x 109 .png image) in the center of 227 x 227 matrix, so I write down a code like this

files = dir('*.png') ; % I am in folder of the png files

N = length(files) ; % total number of files

% loop for each file

for i = 1:N

x = files(i).name ;

b=imread('x');

a=zeros(227);

a(60:168,69:159)=b;

a=uint8(a);

end

end

answer

Error using imread>get_full_filename (line 516)

File "x" does not exist.

Error in imread (line 340)

fullname = get_full_filename(filename);

How can I process all my files in the folder, and save as .png in a new folder ?

[darova]

Try without quotes

 b=imread(x);

Answer 1

[Image Analyst]

Try the padarray() function.

Or if you want to do it by indexing:

    baseFileName = files(i).name ;
    b=imread(baseFileName);
    a=zeros(227, 227, 'uint8'); % Add class and get rid of a=uint8(a); line of code

[YuCheng Chen]

b=imread(baseFileName) has solved.

I have the 227x227(uint8) matrix called "a" now

How do I save "a" as png(and name it) in a new folder of my computer?