Canon PowerShot G3, Service Manual

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Fig. A-3 Flow of iSAPS technology
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.
Specifically, as shown in Figure A-3, the distance
between 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.
Fig.A-2 Distribution of object position
at specific focal-length
* Shortened form of ‘Photographic Space’
High speed and high precision AF, AE and AWB
Prediction of object position
from PS
*
information
Focusing from the most
promising focus-zone
Control by optimized algorithm
according to shooting conditions
AF
Lens focal length (Zoom position) ?
Reference of just before shooting
Brightness of object and environment ?
Low light ? Back light ?
Flash ON ?
AE
AWB
Infinity
Distance
Macro
Dark
Bright
Brigtness
Shooting Frequency
High
Row
L a
n d
-
scape
Outdoor portrait
Indoor snap