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1.4.5 Lookup Table
MAVIS IM-30/IM-100 cameras have a sensor that reads pixel value at a
10bit depth; however, the camera outputs pixel values at an 8bit depth.
When set for 8bit output, the camera normally uses an internal process to
convert the 10bit pixel values from the sensor to the 8bit values transmitted
out of the camera. When making the 10 to 8bit conversion, the internal
process takes the camera current gain and brightness settings into
account.
The MAVIS IM-30/IM-100 camera allows users to use a custom lookup
table to map the 10bit sensor output to 8bit camera output rather than using
the internal process. When the custom lookup table is enabled, the gain
and brightness settings have no effect. The 10 to 8bit conversion is based
solely on the lookup table.
The lookup table is essentially just a list of 1024 values. Each value in the
table represents the 8bit value that will be transmitted out of the camera
when the sensor reports a particular 10bit value for a pixel. The first number
in the table represents the 8bit value that will be transmitted out of the
camera when the sensor reports that a pixel has a value of 0. The second
number in the table represents the 8bit value that will be transmitted out of
the camera when the sensor reports that a pixel has a value of 1. The third
number in the table represents the 8bit value that will be transmitted out of
the camera when the sensor reports that a pixel has a value of 2. And so
on.
The advantage of the lookup table feature is that it allows the user to
customize the response curve of the camera.
The graphs below represent th
Figure 1-6 is for a lookup
table where the values
e contents of two typical lookup tables.
gure 1-6: LUT with Values Mapped in a Linear Fashion
are arranged so that the
output of the camera
increases linearly as the
sensor output increases.
Fi
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