Function with multiple inputs

Question

Poreddy ajaykumar reddy 2021-9-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1451559-function-with-multiple-inputs

回答： Prateek Rai 2021-9-14

采纳的回答： Prateek Rai

在 MATLAB Online 中打开

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

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Poreddy ajaykumar reddy 2021-9-12

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

extension is same

Walter Roberson 2021-9-12

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

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Answer 1

Prateek Rai 2021-9-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1451559-function-with-multiple-inputs#answer_787164

在 MATLAB Online 中打开

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