Basler A600f Instrukcja Użytkownika Pobierz pdf (Strona 42)

Basic Operation & Standard Features

3-18 BASLER A600

f

DRAFT

3.5 Gain and Brightness

On A600f cameras, the output from

the camera’s sensor is digital and the

gain and brightness functions are ac-

complished by manipulation of the

sensor’s digital output signal.

As shown in the top graph in Figure 3-

7, when the gain is set to 0, the full 10

bit output range of the camera’s

CMOS sensor is mapped directly to

the 8 bit output range of the camera. In

this situation, a gray value of 0 is

output from the camera when the

pixels in the sensor are exposed to no

light and a gray value of 255 is output

when the pixels are exposed to very

bright light. This condition is defined as

0 dB of system gain for the camera.

As shown in the three lower graphs,

increasing the gain setting to a value

greater than 0 maps a smaller portion

of the sensor’s 10 bit range to the

camera’s 8 bit output. When a smaller

portion of the sensor’s range is

mapped to the camera’s output, the

camera’s response to a change in light

level is increased.

This can be useful when at your

brightest exposure, a gray value of

less than 255 is achieved. For

example, if gray values no higher than

127 were achieved with bright light,

you could increase the gain setting so

that the camera is operating at 6 dB

(an amplification factor of 2) and see

an increase in gray values to 254.

Figure 3-7: Mapping at Various Gain Settings

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 179 180

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