MATLAB: Jpeg file as funcion input

I'm working on a funtion that is processing some info taken from Jpeg photos; I need to have a Jpeg file as input but I'm not able to fix the code; when I wrote the jpeg file path as input,
 function [ output ] = funcion_name( 'C:\path\photo.jpg' )
matlab is giving me this error ''Unexpected MATLAB expression.''

Best Answer

A function has arguments as inputs, and it is up to the function to interpret these arguments as appropriate. Thus, you would declare your function as:
function output = function_name(jpegfile)
   %check that file is jpeg:
   try
      info = imfinfo(jpegfile);
   catch
      error('File not found or not an image');
   end
   assert(strcmp(info.Format, 'jpg'), 'Image is not jpeg');
   %do something with file...
And you specify the file in the call to the function
   result = function_name('C:\path\photo.jpg');
Unless, you meant to have the file a constant in the function, in which case:
function output = function_name()
   jpegfile = 'C:\path\photo.jpg';
   %do something with jpegfile
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