Ten Ways to Search in Photoshop Elements 11
Search by visual simularities.
After you tag people, you can easily click the People tab at the top of the Organizer window and locate all the people you’ve tagged.
Elements also provides you with the capability to search photos for visual similarities. You may have group shots, architecture, animal life, and so on and want to search for photos where objects in the photos are visually similar. To search for photos with visual similarities, choose Find→By Visual Searches. From the submenu, you can choose Visually Similar Photos And Videos, Objects Within Photos, and Duplicate Photos.
First choose Find→By Visual Searches→Visually Similar Photos and Videos. Return to the By Visual Searches submenu and choose Duplicate Photos.