Basler A202k User Manual download pdf (Page 53)

Operation and Features

BASLER A202

k 3-23

DRAFT

Shift Twice

When the camera is set to shift twice, the output

from the camera will include bit 7 through bit 0

from each ADC along with two zeros as LSBs.

The result of shifting twice is that the output of the

camera is effectively multiplied by four. For

example, assume that the camera is set for no

shift, that it is viewing a uniform white target, and

that under these conditions the reading for the

brightest pixel is 100. If you changed the digital

shift setting to shift twice, the reading would

increase to 400.

3.6.2 Digital Shift in 8 bit Output Modes

No Shift

As mentioned in Section 3.1, the A202k uses 10 bit

ADCs to digitize the output from the CCD sensor. When

the camera is operating in 8 bit output mode, by default,

it drops the least two significant bits from each ADC and

transmits the 8 most significant bits (bit 9 through bit 2).

Note that if bit 9 or bit 8 is set to 1, all of the other bits will automatically be set to 1.

This means that you should only use the shift twice setting when your pixel readings

in 10 bit mode with no digital shift are all below 256.

Since the shift twice setting requires that the two least significant bits always be "0",

the gray value scale will only include every 4th gray value. For example, 4, 8, 16

and so forth.

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Basler A202k User Manual Page 53