8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 140
8.3.15.
Black Level and Auto Black Level
8.3.15.1.
Black Level
The Black Level can change the overall brightness of an image by changing the gray values of the pixels
by a specified amount. The lower the black level, the darker the corresponding image, the higher the black
level, the brighter the corresponding image.
Currently, only ME2S-560-70U3C supports the adjustment of the black level value by channel, and the
black level value of the channel can be changed by switching to the corresponding channel. The
application range of the black level value of other cameras can only be selected as all pixels, and pixel
selection is not supported.
8.3.15.2.
Auto Black Level
The dark current is greatly affected by the ambient temperature and individual differences are greater for
high resolution camera models. The Auto Black Level function can correct the inconsistent performance
of the camera in dark field caused by the difference of temperature and sensor. When the Auto Black Level
is enabled, the black level value is automatically adjusted to ensure that the average gray value of the dark
field is about 0.5 in the highest bit depth image. The default mode is "Off". If it is "Continuous" mode, the
black level is adjustment continuously. If it is "Once" mode, the auto black level mode will automatically
change to Off after once adjustment. If it is "Off" mode, the auto black level is disabled.
Auto Black Level does not support the adjustment of the black level value by channel.
8.3.16.
Remove Parameter Limits
The range of camera parameters is usually limited, and these factory limits are designed to ensure the
best camera performance and high image quality. However, for certain use cases, you may want to specify
parameter values outside of the factory limits. You can use the remove parameter limits feature to expand
the parameter range. The features of the extended range supported by different cameras may be different
and the range may be different, as shown in Table 8-4.
Model
Features
Set the switch to off Set the switch to on
MER2-041-528U3M/C(-L)
Exposure
20~1000000
20~15000000
Auto Exposure
20~1000000
20~15000000
Gain
0~24
0~48
Auto Gain
0~24
0~48
Black Level
0~255 (BPP8)
0~1023 (BPP10)
0~4095 (BPP12)
0~255 (BPP8)
0~1023 (BPP10)
0~4095 (BPP12)
Sharpness
0~3
0~63
White Balance component 0~15.996
0~63.996
Auto White Balance
0~15.996
0~63.996
