imreadAutoRot.m

function im = imreadAutoRot(filename)

% This is a replacement of imread in Matlab to handle auto-rotation in JPEG.
% Matlab seems not able to handle automatic rotation of image in imread 
% (at least until R2012a version).
% Therefore, I wrote this file to automatically rotate the image into the 
% write direction based on EXIF orientation. 
% I have tested this function on iPhone 5 with iOS 6.
% Jianxiong Xiao
% Reference: JPEG image format at http://www.impulseadventure.com/photo/exif-orientation.html

im = imread(filename);

try
    info = imfinfo(filename);
    switch info.Orientation
        case 1
            
        case 2
            im = im(:,end:-1:1,:);
        case 3
            im = imrotate(im,180);
            im = im(:,end:-1:1,:);
        case 4
            im = im(:,end:-1:1,:);

        case 6
            im = imrotate(im,-90);            
        case 5
            im = im(:,end:-1:1,:);
            im = imrotate(im,-90);            

        case 8
            im = imrotate(im,90);            
        case 7
            im = imrotate(im,90);            
            im = im(:,end:-1:1,:);
    end
catch
end