Cheetah Pregius Camera with 10 GigE Vision Interface – User Manual
October 8, 2020
Page
139
of
170
Rev 1.0
Lookup Tables
The user-defined LUT (Lookup Table) feature transforms any 12-bit video data into any other 12-
bit value. For the 10-bit sensor digitization, the camera multiplies the 10-bit pixel data by 4 to get
12-bit pixel data for input into the 12-bit LUT. After the 12-bit LUT transforms the data, the
camera divides the 12-bit data by 4 to get 10-bit pixel values for output to the camera interface.
The camera supports a Gamma control feature and four separate LUTs. All LUTs are available for
modifications. You can generate and upload a custom LUT using the Imperx Upload Utility (see
You can control the image luminance by setting the Gamma control or/and by enabling one of
the LUT. When both Gamma and LUT enabled, the camera implements the Gamma control first
and then applies the LUT.
Factory LUTs
Each LUT consists of 4096 entries, with each entry being 12 bits wide. LUT1 and LUT3 are factory
programmed with a standard Gamma 0.45, LUT2 and LUT4 are pre-programmed with negative
LUT (LUT
OUTPUT
= 4095 – LUT
INPUT
).
The Gamma 0.45 LUT uses the following formula:
LUT
OUTPUT
(ADU with 12 bpp) = 4095 * [(LUT
INPUT
/4095)
0.45
]
For example, if the LUT
INPUT
is 1024 ADU (12 bpp), then LUT
OUTPUT
is
4095*(1024/4095)^0.45=2195.
