Smart Camera User Manual
34
Figure 3. 10
Gain Contro
l
The noise increases when Gain increases. Auto exposure and auto gain are mutually
restricted. When the image is dark, the camera will firstly increase the exposure time.
Secondly, the camera starts to adjust gain value when the exposure time turns to the
maximum. When the image is bright, the camera will firstly decrease gain value.
Secondly, it starts to adjust the exposure time when gain value turns to the minimum.
3.3.6 Gamma Correction
The camera supports gamma correction. Normally, the output of the camera chip and
the number of photon that the sensor (on the chip) received are linear. And gamma
correction provides a non-linear output. If the Gamma value is between 0.5 and 1, the
image brightness decreases while the brightness of the dark area increases. If the
Gamma value is between 1 and 4, the image brightness increases while the brightness
of the dark area decreases.
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0
0.1
0.1
Gamma=1
Gamma=0.5
Gamma=2
Gamma=4
