Basler A400K Manual do Utilizador descarregar pdf (Página 85)

AW00118501000 Features

Basler racer Camera Link 77

8.2 Gain and Black Level

8.2.1 Gain

The camera’s gain is adjustable. As shown in

Fig. 16, increasing the gain increases the

slope of the response curve for the camera.

This results in an increase in the gray values

output from the camera for a given amount of

output from the imaging sensor. Decreasing

the gain decreases the slope of the response

curve and results in lower gray values for a

given amount of sensor output.

Increasing the gain is useful when at your

brightest exposure, the highest gray values

achieved are lower than 255 (for pixel data

formats with 8 bit depth) or 4095 (for pixel

data formats with 12 bit depth). For example,

if you found that at your brightest exposure

the gray values output by the camera were no

higher than 127 (in an 8 bit format), you could

increase the gain to 6 dB (an amplification

factor of 2) and thus reach gray values of 254.

You can use the analog gain for coarsely setting gain and the digital gain for finer adjustment.

Fig. 16: Gain in dB

Gray Values

(12-bit)

(8-bit)

Sensor Output Signal (%)

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 129 130

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Basler A400K Manual do Utilizador Página 85