size of image

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

[Jan]

The question is not clear. I recommend to show the used Matlab commands.

Answer 1

[Wayne King]

size(data,3)

[FIR]

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]

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]

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]

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

Answer 2

[Jonas Reber]

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)

[FIR]

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]

if i use cat i get an error as

CAT arguments dimensions are not consistent.

[Jonas Reber]

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..

?