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TS-2030EN/TS-2076EN Series Progressive Scan Cameras
Camera Features
6.3 ADR (Automatic Dynamic Range) Control
ADR (Automatic Dynamic Range) control is a key algorithm of EN cameras. The ADR algorithm
controls the EN camera parameters on a continuous basis to maintain the contrast-to-noise of the license
plates on passing vehicles to a suitable level required for automatic license plate reading algorithms.
The EN ADR algorithm is unique in that it requires no moving parts and can perform this contrast
maintenance function without having to take multiple images of a vehicle in order to achieve the
required plate contrast. The key to this ability is a separate smart light sensor. Each EN camera can
communicate with up to two smart light sensors. Using these smart light sensors, the EN cameras
automatically optimize Exposure time (or shutter speed), and Video Amplifier Gain (“Gain” in short).
Using EN setup software, user can turn on or off ADR control by accessing “Camera ADR Control”
config register (Address = 50).
6.3.1 Electronic Shutter
Normally, exposure time is controlled automatically by ADR (Automatic Dynamic Range) control
algorithm inside the EN, based on the output from light sensor. However during nighttime installations
it is often convenient to manually adjust the shutter time to a larger value so that the focusing targets and
vehicle used for setup are easily seen with the available road lighting. Manually adjusting shutter speed
can also be useful for certain types of debugging (See Section 7.2, “Problem 2: EN Setup Software
Found the Camera, But the Video Image is Too Dark or Just Black,” on page 47).
The following exposure times are supported
TABLE 5.
TS-2030EN/TS-2076EN Exposure Times (55.0
μ
s x H + 28.7
μ
s):
Shutter Dial
Exposure Time (H)
Exposure Time (
μ
s)
1
1
83.7
2
2
138.7
3
3
193.7
4
4
248.7
5
6
358.7
6
8
468.7
7
9
523.7
8
10
578.7
9
11
633.7
A
13
743.7
B
15
853.7
C
17
963.7
D
18
1,018.7
E
126
6,958.7
F
262
14,438.7
0
525
28,903.7
Содержание Pulnix TS-2030EN Series
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Страница 21: ...Page 9 TS 2030EN TS 2076EN Series Progressive Scan Cameras Tutorial FIGURE 5 Live Image Capturing ...
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