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ALLIED Vision Technologies Pearleye P-030 LWIR User Manual

Page 53

background image

Advanced parameters and commands

Pearleye Technical Manual V2.3.0

53

The parameter

M defines the offset value that is added to each pixel if the

background correction is activated. Depending on settings of parameter j,

M is

automatically set to the mean value of the background image, provided that the
background image acquisition is done with the automatic calibration function
(

k).

In this way it is possible to preserve the constant component of the image irre-
spective of the background correction’s activation state. Integrating a new
background correction image with the command

U does not modify M. Only

the 12 (14) most significant bits of this 16 bits value are relevant.

The following table reveals the bit order:

Example

Set the background correction offset to 291 = 0x123

>

M=1230[CR]

Bit position

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Value (12-bit)

2

11

2

10

2

9

2

8

2

7

2

6

2

5

2

4

2

3

2

2

2

1

2

0

-

-

-

-

a

0

Value (14-bit)

2

13

2

12

2

11

2

10

2

9

2

8

2

7

2

6

2

5

2

4

2

3

2

2

2

1

2

0

-

-

a

0

Table 22: U and M: bit usage

GigE Vision feature name

Description

BGC_OperationMode

Operation mode of the background correction.

(U= command)

While reading this feature the MSB shows the state of the
integration process.

(0=Idle, 1=Busy)

BGC_OffsetValue

Offset value for the background correction.

(M= command)

Table 23: Camera special feature: BackgroundCorrection

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