size of image

FIR
2011 10 7
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Sir i have 15 images,which i have formed into .mat file,it is an 2d images,if it was an 3D I GET SIZE 256*256*15,BUT IN 2D I GET ONLY 256*256,IS THERE ANY WAT TO GET THE THIRG COLUMN AS NUMBER OF IMAGES IN 2D,PLEASE SUGGEST

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Jan
Jan 2011-10-7
The question is not clear. I recommend to show the used Matlab commands.

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Wayne King
Wayne King 2011-10-7

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size(data,3)

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FIR
FIR 2011-10-7
if i do as u said i get answer as one,i need it as 15,which is number of imaged,which is 2D
i have 2D IMAGE
I need it as
256*256*15
Wayne King
Wayne King 2011-10-7
Then store your image as 3-D to begin with. For example:
load wmri;
% X is 128x128x7
imagesc(X(:,:,1)); % first slice
imagesc(X(:,:,2)); % second slice
imagesc(X(:,:,3)); % third slice
size(X,3)
FIR
FIR 2011-10-7
sir wmri si a 3D ,but i have only 2D image ,if i process as u said ,i am getting an error,index exceeds matrix dimensions
Wayne King
Wayne King 2011-10-7
FIR, You can take your 2-D images and make them a 3-D image just like the data in wmri. All you have to do is:
1.) Create an array of zeros
X = zeros(256,256,15);
2.) put your first image, I'm going to call it image1, which is 256x256, into
X(:,:,1) = image1;
3.) Now take your second image, I'm going to call it image2 (256x256) into
X(:,:,2) = image2;
and so on. then you will have a 3-D dataset just like the data in wmri

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Jonas Reber
Jonas Reber 2011-10-7

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how did you store your images? is it a 2d matrix?
did you store it like: (N images of size 3 by 4)
1 1 1 1
1 1 1 1
1 1 1 1
2 2 2 2
2 2 2 2
2 2 2 2
...
N N N N
N N N N
N N N N
or more
1 1 1 1 2 2 2 2 ... N N N N
1 1 1 1 2 2 2 2 ... N N N N
1 1 1 1 2 2 2 2 ... N N N N
do all the images have the same size?
I would advise you to save the images as Imarray = zeros(m size of image , n size of image, numer of images); Imarray(:,:,1) = image1 Imarray(:,:,2) = image2 ...
(or better - use cat)

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FIR
FIR 2011-10-7
I HAVE THOSE 15 IMAGES IN .MAT FILE OF SAME SIZE
NEXT QUESTION:IS it possible to create a stack frpm thode 15 images which i have stored
FIR
FIR 2011-10-7
if i use cat i get an error as
CAT arguments dimensions are not consistent.
Jonas Reber
Jonas Reber 2011-10-7
do you have 15 different mat files? for all those images?
are you aware of the function "imread"?
cat only works if all your images have the same size.
e.g
im1 = rand(4,3);
im2 = rand(4,3);
im3 = rand(4,3);
imarray = cat(3,im1,im2,im3);
otherwise you might want to use a cell array for your images...
imarray{1} = image1;
imarray{2} = image2;
...
and then you can use
numel(imarray)
to find your how many images you have
to display one of them use:
imshow(imarray{1},[]);
etc..
?

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