34
•
Camera Operation
Linea CLHS Series Camera
External Trigger Width Exposure
An alternative external trigger mode allows the external signal width to control the exposure
duration. Line readout time remains similar to programmable exposure modes.
•
EXSYNC (CC1) sets both the line period and the exposure time.
•
The EXSYNC high duration sets the exposure time and the falling edge triggers the start of
exposure.
Exposure = X
1
Line Time
Sensor Readout
1
LVAL delay
2
LVAL
CC1
X
1
X
2
X
3
Exposure = X
2
Sensor Readout
1
Exposure = X
3
Sensor Readout
1
> 2
µ
s
1.
Sensor readout time = 20.8
µ
s
2.
LVAL delay = 41
µ
s
Note:
Maximum line rate =
1
(
𝑒𝑥𝑝𝑜𝑠𝑢𝑟𝑒
𝑡𝑖𝑚𝑒+𝑙𝑜𝑤
𝑡𝑖𝑚𝑒∗
)
*Exposure time must be greater than 4
µ
s, and low time greater than 2
µ
s
GenICam parameters to set:
•
I / O Controls > Trigger Mode > On
•
Camera Control > Exposure Time Source > Trigger Width
Binning
Binning is the combining of two or more image sensor pixels to form a new combined pixel. A
binned image using the same exposure settings as a non-binned image will show an improved
signal-to-noise ratio, reduced scanning times (due to lower spatial resolution) and save as a
smaller image file size compared with a non-binned image, at the expense of lower image
resolution.
In 2 x 2 binning, 4 physical pixels on the sensor are combined into one image pixel. This operating
mode is ideal for applications that require faster acquisition and processing times and require
greater signal collection.
Warning!
When running external line rate and external exposure time, the line rate
must not exceed 1 / (exposure time + low time). Under these conditions the
exposure time will become indeterminate and result in image artifacts. This is not
the case when running internal exposure control.