Canon PowerShot S230 Service Manual page 43

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'
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.
Specifically, as shown in Figure A-3, the
distancebetween the camera and the subject is
estimated from the focal length (zoom position) of the
lens and the peripheral brightness when taking a
photo.
Furthermore, by adding 'photo parameters' which is
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.
• 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.
Prediction of object position
Reference of just before shooting
AF
* Shortend form of 'Photographic Space'
and the 'distance between camera and subject'
Lens focal length (Zoom position) ?
Brightness of object and environment ?
*
from PS information
Focusing from the most
promising focus-zone
High speed and high precision AF, AE and AWB
Fig. A-3 Flow of iSAPS technology
according to the
High
Row
Fig.A-2 Distribution of object position
at specific focal-length
Low light ?
Flash ON ?
Control by optimized algorithm
according to shooting conditions
1-37
focal length (zoom
Brigtness
Dark
Back light ?
AE
AWB
Bright