Top Level Core Specifications.
DIGIC III Image Processor
With DIGIC III, your images boast superior quality, the camera operates at top efficiency and battery life is enhanced. What's more, DIGIC III enables Canon's Face Detection Technology and Red-eye Correction to give you better, more true-to-life people shots. Simply press the Shutter Button halfway down, and the camera automatically pinpoints the faces in the scene and chooses the ideal focus point. The camera controls exposure settings and flash to keep every face looking bright and natural. Red-eye Correction can be handled in-camera, in two ways. The entirely new Red-eye Correction during shooting uses the Face Detection Technology to recognize and remove red-eye from flash images as they're taken, before the file is written to the memory card. It's also possible to correct red-eye during image playback, using simple settings in the A470's menu.

DIGIC III Image Processor
iSAPS Technology is an entirely original scene-recognition technology
developed for digital cameras by Canon. Using an internal database of
thousands of different photos, iSAPS works with the fast DIGIC III Image
Processor to improve focus speed and accuracy, as well as exposure and
white balance.

Diagram of Photographic Space