Casio has announced the release of their latest firmware updates for Casio EX-S600 and Casio EX-Z500. The new firmware update software Version 1.01 will add Keystone Correction to both Casio EX-S600 and Casio EX-Z500 digital cameras.
Correct the snapshot of a blackboard, document, poster, photograph, or other rectangular object that is out of square because it was recorded at an angle.
Performing keystone correction on an image causes a new (corrected) version (1600 × 1200 pixels) to be stored as a separate file
More information is available here