CHEETAH Hardware User’s Manual
Imperx, Inc.
Rev 1.7
6421 Congress Ave.
8/26/2016
Boca Raton, FL 33487
+1 (561) 989-0006
44 of 121
2.7.2 Digital Gain
Digital gain can be varied from 1x (0dB) to 15.9 (24 dB) with a precision of 0.001x.
2.7.3 Digital Offset
Digital offset is a digital count added or subtracted from each pixel. The range is +/- 512
counts.
2.7.4 Black Level Auto-calibration and Black Level Offset
The camera automatically adjusts the black level based on measurements of the dark
reference lines at the start of each frame. It is recommended to always leave the black level
auto-calibration engaged. If the auto-calibration feature is disabled, the user can set the
Black Level Offset and adjust the offset by +/- 512 counts, but the user will have to
characterize the image sensor behavior, because the black level will vary with temperature
and gain.
2.8
DATA OUTPUT FORMAT
2.8.1 Bit Depth
The image sensor digitization level is fixed at 10-bits and these cameras can output
10 or 8-bit data formats. In 8-bit output, standard bit reduction process is used and
the least significant bits are truncated
-
“10-bit” digitization
If the camera is set to output 10-bit data, the image sensor data bits are
mapped directly to D0 (LSB) to D9 (MSB)
If the camera is set to output 8-bit data, the image sensor data most
significant data bits (D2 to D9) are mapped to D0 (LSB) to D7 (MSB).