User`s manual

Smart Features
BASLER A600f 5-23
DRAFT
5.7.8 Lookup Table
A600f cameras have a sensor that reads pixel values at a 10 bit depth, however, the cameras can
be set to output pixel values at an 8 bit depth. When set for 8 bit output, the camera normally uses
an internal process to convert the 10 bit pixel values from the sensor to the 8 bit values transmitted
out of the camera. When making the 10 to 8 bit conversion, the internal process takes the
camera’s current gain and brightness settings into account.
A600f cameras include a smart feature that allows you to use a custom lookup table to map the
10 bit sensor output to the 8 bit 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 8 bit
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 8
bit value that will be transmitted out of the camera when the sensor reports a particular 10 bit value
for a pixel. The first number in the table represents the 8 bit 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 8 bit 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 8 bit 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 the contents of two typical lookup tables. The
first graph is for a lookup table where the values are arranged so that the output of the camera
increases linearly as the sensor output increases. The second graph is for a lookup table where
the values are arranged so that the camera output increases quickly as the sensor output moves
from 0 through 511 and increases gradually as the sensor output moves from 512 through 1023.
Figure 5-5: LUT with Values Mapped in a Linear Fashion
Figure 5-6: LUT with Values Mapped for Higher Camera Output at Low Sensor Readings
8 Bit
Camera
Output
10 Bit Sensor Reading
0
0
1023
255
511255 767
8 Bit
Camera
Output
10 Bit Sensor Reading
0
0
1023
255
511
255 767