How read multiple image to Matlab memory

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I would like to aks You how can I read a multiple image to Matlab ? I have n foto in Folder on my laptop and I need to put all of them into Matlab memory and then I need to convert image to binary image and after that I need convert all my image to double precision. I try make it with for loop but I have no idea how should to do. All od this steps are needed because I would like to make a Neural Network to Recognize a Road Sing. Now I have something like that:
% B=imread('A6E.png'); %Image 1
% B=im2bw(B);
% B=double(B);
%
% C=imread('A6D.png'); %Image 2
% C=im2bw(C);
% C=double(C);
True is, in this way I need all day to put all of my patterns. Someone give me some advice ?
Thank You.
  2 Comments
Stephen23
Stephen23 on 31 May 2018
Pawel Osadnik's "Answer" moved here:
function results = myvarfcn(var)
image = imread(var);
imBW = im2bw(image);
imDouble = double(imBW);
reimage = reshape(imDouble,40000,1);
results.image = image;
results.imBW = imBW;
results.imDouble = imDouble;
results.reimage = reimage;
end
I have something like this and it is working, but... Answer is 1-by-1 structure with all (4) results. Ok, but how can I upload (all at once) files into this function ? And after that I need one big structure or many structure with results from my files.
For my NN need one Matrix with all patterns.
Thank.

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Accepted Answer

Florian Morsch
Florian Morsch on 30 May 2018
You could use the the Image Batch Processor if you have it at hand: https://de.mathworks.com/help/images/batch-processing-using-the-image-batch-processor-app.html
Here you can load all images from a file and do something with them ( Your function would look something like this:
function results = myimfcn(im)
%Image Processing Function
%
% IM - Input image.
% RESULTS - A scalar structure with the processing results.
%
%--------------------------------------------------------------------------
% Auto-generated by imageBatchProcessor App.
%
% When used by the App, this function will be called for every input image
% file automatically. IM contains the input image as a matrix. RESULTS is a
% scalar structure containing the results of this processing function.
%
%--------------------------------------------------------------------------
% Replace the sample below with your code----------------------------------
imBW = im2bw(im);
imDouble = double(imBW);
results.imBW = imBW;
results.imDouble = imDouble;
%--------------------------------------------------------------------------
The batch processor app loads all images you tell it, uses the function you insert on the images and then you can save the results as you please.
  5 Comments
Pawel Osadnik
Pawel Osadnik on 31 May 2018
Edited: Pawel Osadnik on 31 May 2018
I now about it, my mistake. I change this for code: And use Image Batch Processor App.
function results = myimfcn(im) %Image Processing Function % % IM - Input image. % RESULTS - A scalar structure with the processing results. %
%-------------------------------------------------------------------------- % Auto-generated by imageBatchProcessor App. % % When used by the App, this function will be called for every input image % file automatically. IM contains the input image as a matrix. RESULTS is a % scalar structure containing the results of this processing function. % %-------------------------------------------------------------------------- % Replace the sample below with your code----------------------------------
imBW = im2bw(im);
imDouble = double(imBW);
imReshape = reshape(imDouble,40000,1);
results.imBW = imBW;
results.imDouble = imDouble;
results.imReshape = imReshape;
And now I have my files in matlab but as Struct. And this problem because NN need matrix. My one cell in struct is a 40000x1 and this I need to have in my Workspace.
imReshape
____________
40000x1 double % This I need to have in Workspace as a single Matrix
40000x1 double
40000x1 double
40000x1 double
etc
Any idea how to "convert" struct to matrix ?

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More Answers (1)

Pawel Osadnik
Pawel Osadnik on 31 May 2018
I make it. Thank for Your help.

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