Allied Vision Technologies MF-145B2 Instruction Manual download pdf (Page 65)

Description of the data path

8.6 Setting the brightness (black level or offset)

-m s (@ 8 bit). Increments are in 1/16 LSB (@ 8 bit).

MOS-model: 0 … +127 (@ 8 bit)

ula ffset

e IIDC register brightness at offset 800h is used for this purpose. Description is identical to

8.7 Auto shutter

In combination with auto white balance, all CCD- and CMOS models are equipped with auto-

shutter feature.

When enabled, the auto shutter adjusts the shutter within the default shutter limits or within

those set in advanced register F1000360h in order to reach the reference brightness set in auto

exposure register. Increasing the auto exposure value increases the average brightness in the

image and vice versa.

The applied algorithm uses a proportional plus integral controller (PI controller) to achieve

minimum delay with zero overshot.

The following table shows the Shutter CSR.

It is ossible to set the black level in the camera within the following ranges:

CD odels: 0...+16 gray valueC

The form for gain and offset setting is: Y`= G*Y+O

 Setting the gain does not change the offset (black value) for CCD models.

 Setting the gain changes the offset (black value) for CMOS models. This is due to the lack

of black clamping circuitry in sensor.

GAIN.

0xF0F0081C SHUTTER Presence_Inq [0] Presence of this

feature: 0: N/A;

1: Available

Abs_Control [1] Absolute value

control

O: Control with value

in the value field

1: Control with value

in the absolute value

CSR

If this bit= 1 the

value in the value

field has to be

ignored

- [2..4] Reserved

One_Push [5] Write: Set Bit high to

start

MARLIN Technical Manua

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Allied Vision Technologies MF-145B2 Instruction Manual Page 65