CHEETAH 3G-SDI Camera
November 16, 2017
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Rev 1.1
luminance (brightness), and the camera will adjust the gain accordingly.
Luminance options are average or peak.
The camera starts by changing the gain within the specified min-max limits.
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If reaching one of the gain limits, the camera indicates reaching the limit
and keeps the value until the light condition change. You can set the
speed of convergence from four possible options.
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If enabling AEC mode and AGC mode together, the camera starts by
changing the exposure first within the specified min-max limits.
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If reaching the maximum exposure limit, the camera adds gain and
changes it within the specified min-max limits.
The AEC/AGC algorithm samples all pixels for the entire frame, but you can select
only a portion of the image (AOI) to calculate the luminance level. The camera
displays the current luminance within the frame (or AOI, if selected), the current
exposure, and the current gain.
4.4 I/O Control
The camera supports one tri-level sync input for analog video synchronization,
one TTL output (strobe), and one opto-isolated strobe (or optional P-Iris). You
can enable genlock mode when connected to an external tri-level sync device
providing input/output synchronization of frame rates. A second opto-isolated
strobe is available. An optional P-Iris control can replace the second opto-
isolated strobe. A custom interface cable to support the second strobe and
firmware update are required. Contact IMPERX customer service for details.
4.5 Strobe Control
The 3G-SDI camera supports two independently controlled strobe signals.
Typically, the strobe output synchronizes an external light source or additional
cameras with the master camera timing. The strobe activates at the end of the
exposure period just as the readout period begins. If using internal exposure
control, you can position the strobe to occur when the exposure time starts by
using the strobe delay feature. You can position each strobe pulse within the
entire frame-timing period with a precision of 1.0 microsecond. You can set the
strobe position and duration from 1.0 microsecond to the maximum frame time
with a precision of 1.0 microsecond.
4.6 Gamma Control
The camera’s built
-in processing engine enables adjustments to the luminance
(brightness) of an image on the monitor. Using gamma correction, you can
control, stretch, or compress the image luminance with eight different gamma
curves from darker (2.2) to brighter (1/2.2).
You can also apply black gamma correction specifically to adjust the darker
portions of an image or the brighter portions of the image and apply one of four
User configurable LUTs. The User configurable LUTs are pre-programmed as
follows:
