Faber M1600 用户手册

36  •  Operational Reference 

The Genie series of monochrome cameras provide gain and black level adjustments for the analog signal from each 
CCD pixel, before the analog to digital conversion. The software gain and black level controls can make small 
compensations to the acquisition in situations where lighting varies and the lens iris can not be easily adjusted. The 
user can evaluate Gain and Black Level by using CamExpert.  

Features and limitations are described below. 
•  Gain is expressed in decibels (dB). Range from -6dB to +12dB in 0.1dB increments. Gain is a multiplication 

factor to the analog signal (i.e. exposure) before digitization.  
Note that a gain of 6dB is a multiplier of 2 (doubles the level).  

•  Increasing gain increases the amplitude of the analog video signal but also increases the sensor analog noise 

proportionately, before analog to digital conversion.  

•  Note: Doubling gain does not necessarily double the digital data due to the Black Level Offset value as 

described below.  

•  Black level offset is applied to the sensor analog signal to shift the DC level of the video signal. Black level is 

an additive offset to the analog video signal before digitization. 

•  Black level offset increases the brightness of the video signal equally. Therefore any area of the video that is 

black will brighten to some gray level as offset is increased.  

•  Black level offset is expressed as a number ranging from -128 to 127. The offset is achieved as a change in the 

analog signal from the sensor where a control number change of 1 is 1/16

th

 of a DN (digital number) pixel 

change. In other words, a control change of 16 is required for each change in pixel value, therefore a maximum 
control value of 127 will cause a black pixel (00) to have a gray value of about 8.  

•  The resultant output Gain/Offset formula is 

(

)

+

=

*

 

)

log(

20

:

=

 

 

 

Sapera

 

Genie Sapera parameters for Gain and Black level: 
Gain = Amplification in dB from -6.0 to 12.0 dB 
BlackLevel = DC offset in 1/16

th

 of DN, range from -128 to 127 

In CamExpert, these parameters are available under the “Sensor” tab. 
See 

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.  

 

 

 

GenICam features for Gain and Black level: 
GainRaw = Analog gain in tenth of dB (0.1 dB) 
BlackLevelRaw = Black level (offset) in 1/16 of DN