2-8
1. AE (Auto Exposure) control
The luminance level of camera output picture is controlled to always be proper exposure regardless of the
brightness and illumination of the object.
1) AE input information
•
Average of luminance level divided a frame picture into 48 blocks passed through the LPF.
•
The area ratio of the sections having luminance components higher than a certain level to the
whole sections.
AE control
Weighting of
sectioned data
Caluculation of
evaluation value
Target > Evaluation?
AGC gain down
↓
Slow shutter OFF
↓
Iris close
Iris open
↓
AGC gain up
↓
Slow shutter ON
RET
Fig. 2-3-2 AE control flow chart
2) Weighting of data on sections
Though the respective data on 48 sections are weighted, the basic setting is to weight the center part
high.
Low
Low
High
High LowLow
Fig. 2-3-3 Weighting of data on sections
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