montage function

Hi, i am trying to create a montage of several pictures captured as matrix grid (matrix size >10).

fileFolder = fullfile(matlabroot,'toolbox','images','imdemos');
dirOutput = dir(fullfile(fileFolder,'AT3_1m4_*.tif'));
fileNames = {dirOutput.name};
montage(fileNames(1:num), 'Size', [m_h m_w]);                         
imsave;

however, i have had several problem with this code: 1. it seems that montage only works if files are stored into the C:\Program Files\MATLAB\R2010B\toolbox\images\imdemos and with names corresponding to MATLAB montage example (AT3_1m4_*.tif') 2. Also the number of files that i manage to opne are max 10...again as for MATLAB montage example.

How can i use the function montage with files stored in other folders and with other names? but more important...how can i work with more than 10 files??

Thanks for your help! Giulio

Answer 1

[Nathan Greco]

The montage function allows you to input your own path to images that you want to use.

   doc montage

Example, if the pictures that you wanted to use were in C:\pictures, you would type:

   fileFolder = 'C:\pictures';
   dirOutput = dir(fullfile(fileFolder,'*.jpg')); % *.jpg indicates 
          %only jpg files. this can be changed to anything you like.
   fileNames = {dirOutput.name};
   montage(fileNames);

Nowhere in the documentation does it say that you are limited in the number of files that you can montage.

If you are using a matrix of images (2-d images (with color being the 3rd dimension) stacked in a 4-d matrix), it is much simpler. Assume IMGS is your 4-d matrix of images.

    montage(IMGS);

Note that if you want to use your own images, do not save them in the matlab toolbox folders. Create your own folder somewhere else (a MATLAB folder is usually created by default under your Documents and Settings folder, if you'd like to use that one).

[Giulio]

Hi,

i tried again to create a folder in C: but still get the same error message althogh the folder 'C:\temp_semgui' do contain 'file_1.tif'.

Giulio

fileFolder = 'C:\temp_semgui';

dirOutput = dir(fullfile(fileFolder,'*.tif'));

fileNames = {dirOutput.name}

montage(fileNames(1:num), 'Size', [m_h m_w]);

error message:

file_1.tif

??? Error using ==> getImageFromFile at 14

Cannot find the specified file: "file_1.tif"

Error in ==> montage>getImagesFromFiles at 342

[img, map] = getImageFromFile(fileNames{1}, mfilename);

Error in ==> montage>parse_inputs at 227

[I,cmap] = getImagesFromFiles(varargin{1});

Error in ==> montage at 112

[I,cmap,mSize,indices,displayRange] = parse_inputs(varargin{:});

Error in ==> SEMgui_2>pushbutton1_Callback at 295

montage(fileNames(1:num), 'Size', [m_h m_w]);

Error in ==> gui_mainfcn at 96

feval(varargin{:});

Error in ==> SEMgui_2 at 42

gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)SEMgui_2('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

[Nathan Greco]

Is your current folder in Matlab that folder? If that folder is not on the Matlab path, I'm not sure it can find the image(s).

See: path

[Giulio]

Yes!

the problem was the path!

i added the path where the files where stored addpath('C:\temp_semgui') and then it worked out.

Thanks a lot for your help!!!

Giulio

Answer 2

[Shahrin Islam]

Hello. Is there any way to get directly output in montage from code using several image processing techniques?