Hi, how do I save the output to a specific folder?

Hi, I am trying to save the output of this code but I can't seem to use imsave or imwrite.

        I = imread('C:\Users\Student\Desktop\Vehicle number plate recognition\vehicles\vehicle10.jpg'); 
        BW = im2bw(I,0.4); 
        se = strel('rectangle', [2 20]); 
        BW_opened = imclose(BW,se); 
        figure, imshow(BW_opened,[]) 
        s=regionprops(BW_opened,'Area','BoundingBox'); 
        [hh,ii] = sort([s.Area],'descend'); 
        out = imcrop(I,s(ii(2)).BoundingBox); 
        figure,imshow(out); 

        out = 'my new image.png'; % Whatever....
        fullFileName = fullfile(out, 'C:\Users\Student\Desktop\Vehicle number plate recognition\test images');
        imwrite(out, fullFileName);

I would get an error of :| | _Error using imwrite>parse_inputs (line 528) The first argument should not be a character vector.

Error in imwrite (line 418) [data, map, filename, format, paramPairs] = parse_inputs(varargin{:});||

Error in licenseplatecrop (line 13) imwrite(out, fullFileName);_

Answer 1

[KSSV]

          I = imread('C:\Users\Student\Desktop\Vehicle number plate recognition\vehicles\vehicle10.jpg'); 
          BW = im2bw(I,0.4); 
          se = strel('rectangle', [2 20]); 
          BW_opened = imclose(BW,se); 
          figure, imshow(BW_opened,[]) 
          s=regionprops(BW_opened,'Area','BoundingBox'); 
          [hh,ii] = sort([s.Area],'descend'); 
          out = imcrop(I,s(ii(2)).BoundingBox); 
          figure,imshow(out); 
          out_path = 'C:\Users\Student\Desktop\Vehicle number plate recognition\vehicles'; % Give path here
          fullFileName = fullfile(out_path, 'test_image.jpg');
          imwrite(out, fullFileName);

[Syafiqah Daud]

Hi, can i ask how do i am able to change the file name into a new name each time i save a new output?