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2 0 H a M e s i l a S t . , N e s h e r 3 6 8 8 5 2 0 , I s r a e l
P O B 2 5 0 0 4 , H a i f a 3 1 2 5 0 0 1 , I s r a e l
T e l : ( + 9 7 2 ) - 7 2 - 2 7 2 3 5 0 0 F a x : ( + 9 7 2 ) - 7 2 - 2 7 2 3 5 1 1
www.kayainstruments.com Page no. 19 | Configuration Interface
max_𝑣𝑎𝑙 =
ExposureAutoRatio
[
red
]
∗ max_𝑣𝑎𝑙[𝑟𝑒𝑑]
+ ExposureAutoRatio
[
green
]
∗ max_𝑣𝑎𝑙[𝑔𝑟𝑒𝑒𝑛]
+ ExposureAutoRatio
[
blue
]
∗ max_𝑣𝑎𝑙[𝑏𝑙𝑢𝑒]
𝑟𝑜𝑖_𝑎𝑣𝑔 =
BrightnessLevelAveragePeakBalance
∗ 𝑎𝑣𝑔_𝑣𝑎𝑙
+ (1 −
BrightnessLevelAveragePeakBalance
) ∗ max_𝑣𝑎𝑙
The algorithm strives to make roi_avg value as close as possible to the specified “DesiredBrightnessLevel” by
changing Exposure and Analog Gain. Current average value and maximum value can be retrieved using
“AverageBrightnessLevel” and “PeakBrightnessLevel” parameters.
Brightness parameters can be seen in the following table:
Parameter Description Gen<i>Cam name Type Possible values Remarks
Value Gen<i>Cam name
Gen<i>Cam Category: AnalogControl
Desired
Brightness Level Desired brightness level for
auto compensation algorithm DesiredBrightnessLevel Integer Range: 0 to
<max pixel
value>
Average
Brightness Level Current average brightness
level result from auto
compensation AverageBrightnessLevel Integer Range: 0 to
<max pixel
value>
Peak Brightness
Level Current peak brightness level
result from auto
compensation PeakBrightnessLevel Integer Range: 0 to
<max pixel
value>
Brightness Level
Average Peak
Balance Sets the effective ratio of
Average Brightness Level as
complement to Peak
Brightness Level BrightnessLevelAveragePeakB
alance
Float Range: 0 to 1 1 - Complete
Average Level and
0 - Complete Peak
Level
Auto Exposure
Ratio Selector Selects which Exposure Auto
compensation ratio to control ExposureAutoRatioSelector Enumeration 0x00 Red
0x01 Green
0x02 Blue
Auto Exposure
Ratio Controls ratio of the selected
color component to a
reference color component ExposureAutoRatio Float Range: 0 to 1
Table 9 – Brightness level control
6.3.6 Auto Exposure & Gain ROI Definition
ROI definition refers to Region of Interest which will be used for brightness calculations. The ROI Offset X and
Offset Y refer to the distance of the ROI from top left corner of sensor area:
Figure 13 – ROI position in relation to the origin