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Cheetah Pregius Camera User Manual | 3G-SDI Interface
You can define the AOI with width and height (X and Y) coordinates and set the speed of
convergence, which determines how fast the camera stabilizes after a change in luminance.
Area:
Use the Area controls to define an active Area of Interest (AOI). The camera uses the
image data inside the AOI to calculate the luminance for adjusting exposure, gain,
and iris parameters. The camera ignores brightness changes outside of the AOI.
Changes in the AOI luminance, as determined by the firmware, cause changes in the
exposure, gain, and/or iris position. The camera applies them to the entire image. In
other words, if AOI luminance deviates from the target (limit), the exposure, gain,
and/or iris adjusts automatically to compensate.
To define an AOI:
1. Select AEC, AGC, and/or AIC.
2. Enter the AOI width/height and offset (X, Y) values in the up/down scroll fields.
a.
X offset describes the starting column for the AOI window and is the distance in pixels
from the left side of the screen.
b. Y offset describes the starting row for the AOI window and is the distance in pixels
from the top of the screen.
3. Alternatively, you can draw the AOI by clicking and dragging across the display area. A red
box appears, and the dimensions and offset values of the box populate the width/height
and offset fields automatically.
Luminance Limit:
April 14, 2021
This sets the desired luminance level (in output counts), which the
camera is to maintain within the image. The software adjusts the image
exposure, gain, and iris as needed to maintain the image luminance at or
near the target value. You can select either average or peak luminance as
the target and specify the desired target output counts from 1 to 4096.
Average – the firmware calculates the average value of the image
•
luminance (in counts) within the image or within the AOI and
compares the value to the target (Limit value) to determine changes
to the exposure/gain settings.
Page
47 of 99
Rev 1.4
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