IDS Software Suite 4.96.1
In digital imaging, a voltage proportional to the amount of incident light is output by the sensor. To increase image brightness and contrast, this signal can be amplified by an analog gain and offset before the digitizing process. The results of analog signal processing are usually better than the results of digital post-processing.
Analog amplification of the read-out pixel values increases overall image brightness and contrast. Depending on the sensor type, a global gain value for all pixels (master gain) or a separate gain value for each color (RGB gain) can be set.
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Note on using sensor gain A signal gain will also result in a noise gain. High gain settings are therefore not recommended. We suggest the following gain settings: 1.Enable the Gain boost function (is_SetGainBoost()). 2.If required, adjust the gain setting with the master gain control. |
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Note on the linearity of sensor gain You can set the gain factor in increments from 0 to 100. •For CCD sensors the gain increases usually not linear but disproportionate. •For CMOS sensors the gain increases linear. Some sensors have only 32 or fewer levels, so not each step is assigned to a level. The maximum gain factor settings also vary from sensor to sensor (see Camera- and sensor data). |
Offset
Every digital image sensor has light-insensitive cells next to the active image area. These dark pixels are used to measure a reference voltage (black level) which is subtracted from the image signal. This compensates thermally generated voltages on the sensor which would otherwise falsify the signals.
Normally, the sensor adjusts the black level automatically. If the environment is very bright or if exposure times are very long, it may be necessary to adjust the black level manually.
