how to make sure image resolution?

Hi everyone, i have one problem about image resolution. I have took an image which has resolution 4000 pixels of width and 3000 pixels of height (the appearanced is landscape when viewed in photo viewer). Unfortunately, when I load in Matlab (using imread), the resolution is changing itself. Its become 3000 pixels of width and 4000 pixels of height, and when it show using imshow its become potrait. I appreciate if anyone could help me out figuring how it can be happened. Thanks and best wishes

Answer 1

[Rik]

Some cameras store the orientation in the EXIF data, which Matlab generally ignores. In my PhotoAnnotation tool I used an external tool to extract this from the file, but depending on the release you're using you might be able to use native Matlab tools.

[dms]

Hi Rik, thank you anyway for your valuable response. Could you give me any suggestion how to prevent those problem in advanced?

[Rik]

Walter has posted this code in a previous question:

IM = imread('YourFile.jpg');
info = imfinfo('YourFile.jpg');
if isfield(info,'Orientation')
   orient = info(1).Orientation;
   switch orient
     case 1:
        %normal, leave the data alone
     case 2:
        IM = IM(:,end:-1:1,:);         %right to left
     case 3:
        IM = IM(end:-1:1,end:-1:1,:);  %180 degree rotation
     case 4:
        IM = IM(end:-1:1,:,:);         %bottom to top
     case 5:
        IM = permute(IM, [2 1 3]);     %counterclockwise and upside down
     case 6:
        IM = rot90(IM,3);              %undo 90 degree by rotating 270
     case 7:
        IM = rot90(IM(end:-1:1,:,:));  %undo counterclockwise and left/right
     case 8:
        IM = rot90(IM);                %undo 270 rotation by rotating 90
     otherwise
        warning(sprintf('unknown orientation %g ignored\n', orient));
   end
 end

[dms]

Thanks a lot for your help Rik. I'll try it first.