Function with multiple inputs

Hello everyone

I have a function with two inputs

function [output_image]=multiple(input_1,input_2)
assume
input_1=imread('image from input folder_1')
input_2=imread('image from input folder_2 ')
output_image=input_1+input_2  % assume this as preprocessing stage
%i need to stire all the images after prerocessig in folder
%i have 90 images in folder_1 and 90 images in folder_2 and this images
%should be read in sequence 
%example like folder_1 : 1st image 
% folder_2=first image

end

please help me to write a loop

[Walter Roberson]

Do the images in the folders have the same names? Or do they have related names so that you can calculate the name in the second folder given only the name in the first folder?

Are you restricting this to only one file extension for the inputs?

[Poreddy ajaykumar reddy]

@Walter Roberson they have different names and they are from different folders

extension is same

[Walter Roberson]

Okay, so given the name in one folder, how do you know which name in the other folder is the corresponding image ?

Answer 1

[Prateek Rai]

To my understanding, you have 2 folders with same number of images and you want to preprocess the images and use the final output image. First of all you can make a hierarchy of files in the following way.

• folder_1 contains 90 images
• folder_2 contains 90 images
• folder_3 (empty folder to save output image)

Now you can use imageDatastore function to read all images from folder_1 and folder_2.

imds1 = imageDatastore('folder_1');
imds2 = imageDatastore('folder_2');

Number of images in folder can be retrieved using:

l = length(imds1.Files);

Now you can run a loop from i=1 to length and read images from folder_1 and folder_2, make the required calculations and finally write the new preprocessed image in folder_3.

for i=1:1:l
    
    % reading images one by one from folder_1 and folder_2
    img1 = imread(imds1.Files{i});
    img2 = imread(imds2.Files{i}); 
    
    out_img = img1+img2; % preprocessing stage
    
    % this is important to create a location where final image can be saved
    % You can change '.jpg' with the file format your images have
    output_loc = "folder_3\image" + num2str(i) + ".jpg"; 
    
    % It will save the prepocessed image in the location specified by output_loc
    imwrite(out_img,output_loc) 
end

Here is a full working function for your problem:

imds1 = imageDatastore('folder_1');
imds2 = imageDatastore('folder_2');

l = length(imds1.Files);

for i=1:1:l
    
    % reading images one by one from folder_1 and folder_2
    img1 = imread(imds1.Files{i});
    img2 = imread(imds2.Files{i});
    
    out_img = img1+img2; % preprocessing stage
        
    % this is important to create a location where final image can be saved
    % You can change '.jpg' with the file format your images have
    output_loc = "folder_3\image" + num2str(i) + ".jpg";
      
    % It will save the prepocessed image in the location specified by output_loc
    imwrite(out_img,output_loc)
    
end

You can refer to imageDatastore MathWorks documentation page to find more on Datastore for image data.