CV-A20
CL / CV-A80
CL
6.
Functions and Operations
The CV-A20CL/CV-A80CL uses a rolling shutter CMOS image sensor and outputs digital 10-bit or 8-
bit video, formatted as Odd and Even Interleaved output. The camera operates in Continuous and
Snap-shot Trigger modes. The camera allows Windowing for faster frame rates. The CV-A20CL/CV-
A80CL provides a Strobe output to control the timing of strobe flash.
6.1.
Basic Functions
6.1.1.
Formatted Odd and Even Interleaved output
Although the CV-A20CL CMOS sensor operates at 148.5MHz, the output pixel rate is a half of that,
74.25MHz due to using the Formatted Odd and Even Interleaved output.
Odd pixels of lines and even pixels of lines are output respectively as shown the below.
1
2
3
4
5
19
20
19
19
19
18
19
17
1
2
3
4
1079
1080
1
2
3
4
5
19
17
19
18
19
19
19
20
Total 1920 columns
Rows
1
3
5
19
19
19
17
2
4
6
19
18
19
20
Odd Pixel
Even Pixel
Total 960 columns
1
3
5
19
19
19
17
2
4
6
19
18
19
20
Odd Pixel
Even Pixel
Fig. 9. Formatted Odd and Even interleaved output
6.1.2.
Strobe-preset Snap-Shot trigger operation
The snap-shot trigger mode allows the capture of a complete frame when used in conjunction with
a strobe light or a mechanical shutter. The scene to be captured must be shielded from all
ambient light. The Strobe output can be used to synchronized strobe illumination / mechanical
shutter to ensure that the sensor is exposed in the proper period.
Fundamental operating procedure:
1.
After the external trigger is received, the strobe out signal is output. The delay and width
of the strobe pulse can be programmed by the using the commands "RB", "ENL" and "ENP".
See chapter 6.3.2 for details.
2.
The strobe light illuminates the scene.
3.
The sensor is read out at the end of the strobe period. At this time the sensor must again
be shielded from ambient light.
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