Canon S230 manual High speed and high precision AF, AE and AWB

For more than 60 years since its inception, Canon has been asking ‘how can we take better pictures?’ As it has progressed, Canon has built up a tremendous database of know-how on photography as a result of its camera developments. From this photo data covering an enormous number of frames, Canon has classified statistically the frequency that users take certain photos and created a ‘Photographic Space’ (Figure A-2) that relates the ‘peripheral brightness’ and the ‘distance between camera and subject’ according to the focal length (zoom position) of the lens when taking a picture.

The PowerShot G3, the PowerShot S45 and the IXY
DIGITAL 320 all come with functions that utilize this
‘Photographic Space’ data.	High
Specifically, as shown in Figure A-3, the	Shooting
distancebetween the camera and the subject is
estimated from the focal length (zoom position) of the	Frequency
lens and the peripheral brightness when taking a
photo.
Furthermore, by adding ‘photo parameters’ which is	Row
obtained with just before shooting, the scene that the
user is about to photograph is pre-analyzed and
precalculated. This method realizes faster and more
precise AF, AE and AWB than ever before.

• iSAPS High-speed AF

Using this iSAPS technology, the cameras achieve faster focusing speeds by optimizing the control of the AF scan range through a pre-analysis process to match the scene the user is about to take.

			-
			d
			n
			a
snap		portrait	L
			scape
Indoor
	Outdoor

		Bright
Macro	Distance	Brigtness
	Infinity	Dark

Fig.A-2 Distribution of object position at specific focal-length

• iSAPS Intelligent AE/AWB

Using this iSAPS technology, the cameras achieve precise exposure and white balance through an algorithm optimized for the scene the user is about to take by analyzing the scene beforehand.

Lens focal length (Zoom position) ?

Brightness of object and environment ?

	Prediction of object position
		Low light ? Back light ?
	from PS* information
		Flash ON ?
	Reference of just before shooting
		AE
AF
		AWB
	Focusing from the most	Control by optimized algorithm
	promising focus-zone	according to shooting conditions

High speed and high precision AF, AE and AWB

Fig. A-3 Flow of iSAPS technology

* Shortend form of ‘Photographic Space’

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