Set Gamma Correction - HikRobot CoaXPress User Manual

Steps:
1. Select Off as Balance White Auto. At this time, Balance Ratio is 1024.
2. Find corresponding R/G/B channel in Balance Ratio Selector. Here we take Green as an
example.
3. Find camera's R/G/B value.
4. Take Green as correction standard, and manually adjust other two channels (R channel and B
channel) to let these three channels have same value.
 Here we take Green as an example. For specific Balance Ratio Selector value, please refer to
the actual condition.
 In order to avoid repeated correction after rebooting the camera, it is recommended to save
white balance parameter to User Set after white balance correction. You can refer to the
Section Save and Load User Set for details.
If the light source and color temperature in environment change, you need to correct white
balance again.

10.15 Set Gamma Correction

The camera supports Gamma correction function. Generally, the output of the camera's sensor is
linear with the photons that are illuminated on the photosensitive surface of the sensor. Gamma
correction provides a non-linear mapping mechanism as shown below.
 Gamma value between 0.5 and 1: image brightness increases, dark area becomes brighter.
 Gamma value between 1 and 4: image brightness decreases, dark area becomes darker.
There are 2 types of Gamma correction, including User mode and sRGB mode. You can set User
mode as shown below.
CoaXPress Area Scan Camera
1
0.9
0.8
0.7
Gamma=0.5
0.6
0.5
Gamma=1
0.4
0.3
0.2
0.1
0
0.2
0 0.1
0.3 0.4
Figure 10-24 Gamma Curve
User Manual
·
Gamma=2
Gamma=4
1
0.6 0.7 0.8 0.9
0.5
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