Look-up table (lut) and gamma function – ALLIED Vision Technologies Stingray F-504 User Manual
Page 139
Description of the data path
STINGRAY Technical Manual V4.4.4
137
Look-up table (LUT) and gamma function
The AVT Stingray camera provides one user-defined look-up table (LUT). The
use of this LUT allows any function (in the form Output = F(Input)) to be
stored in the camera's RAM and to be applied on the individual pixels of an
image at run-time.
The address lines of the RAM are connected to the incoming digital data,
these in turn point to the values of functions which are calculated offline,
e.g. with a spreadsheet program.
This function needs to be loaded into the camera's RAM before use.
One example of using an LUT is the gamma LUT:
There is one gamma LUT (gamma=0.45)
Output = (Input)
0.45
This gamma LUT is used with all Stingray models.
Gamma is known as compensation for the nonlinear brightness response of
many displays e.g. CRT monitors. The look-up table converts the incoming
12 bit from the digitizer to outgoing 10 bit.
Note
Configuration
•
To configure this feature in an advanced register: See
Table 138: Advanced register: Shading
•
For information on GPDATA_BUFFER: See Chapter