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From: Aydos R on 8 Jun 2010 06:38
hi there,
I have a dataset including "jpg" files...

data/
model 1.jpg
model 2.jpg
..
..
model 30.jpg

and I would like to read all the images by using "imread" function...
but instead of coding like ;

img1=imread('./data/model 1.jpg');
img2=imread('./data/model 2.jpg');
..
..
img30=imread('./data/model 30.jpg');

I would like to do it by "for" cycle...for example;

for i=1:30
img(i)=imread('./data/model (i).jpg');
end

and after applying some image processing steps I would like to save the images to another directory.For example ;

imwrite(img1edited,'./editeddata/editedmodel 1.jpg');
imwrite(img2edited,'./editeddata/editedmodel 2.jpg');
..
..
imwrite(img30edited,'./editeddata/editedmodel30.jpg');

same as "imread" process,I would like to do it by "for" cycle..like;

for i=1:30
imwrite(img(i)edited,'./editeddata/editedmodel (i).jpg');
end

but I do not know how to do it..Can anyone help me,please?
thanks
From: ImageAnalyst on 8 Jun 2010 06:47
Use dir() to get the filenames.
Use sprintf() to make up new filenames.
Review the FAQ for more handy tidbits of information:
http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Aydos R on 8 Jun 2010 09:09
a=dir('./data/*.jpg')
for i=1:30;
c=imread(a(i).name);
d=edge(c,'canny');
imwrite(d,'./editeddata/','editedmodel',strcat(i),'.jpg');
end

Reading part is OK...But,I still have some problems about writing...
After the process I would like to see that folder and files...

/editeddata
editedmodel 1.jpg
editedmodel 2.jpg
..
..
editedmodel 30.jpg

I know this line is wrong but how can I fix it;
imwrite(d,'./editeddata/','editedmodel,'strcat(i),'.jpg');

thanks
From: Walter Roberson on 8 Jun 2010 09:23
Aydos R wrote:
> a=dir('./data/*.jpg')
> for i=1:30;
> c=imread(a(i).name);
> d=edge(c,'canny');
> imwrite(d,'./editeddata/','editedmodel',strcat(i),'.jpg');
> end

strcat() does not format an integer as a string.

imwrite(d, sprintf('./editeddata/editedmodel/%d.jpg', i));

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