Allied Vision Technologies MF-145B2 Instruction Manual download pdf (Page 62)

Description of the data path

8.4 Manual gain

As shown in figure 29, all cameras are equipped with a gain setting, allowing the gain to be

anually” adjusted on the fly by means of a simple command register write.

eo signal:

“m

The following ranges can be used when manually setting the gain for the analog vid

Type Range Range in dB

B/W CCD-cameras 0 ... 680 0 … 24 dB

Color CCD-cameras 0 ... 450 0 … 16 dB

CMOS camera 1 … 14 0 … 16 dB

Table 33: Manual gain range of the various Marlin types

The increment length is ~0.0354 dB/step for CCD-models and 1.25 dB for CMOS.

nce, all CCD- models are equipped with auto gain feature.

ithin the default gain limits (see table 33) or within

e limits set in advanced register F1000370h in order to reach the brightness set in auto

xposure register as reference. Increasing the auto exposure value increases the average

brightness in the image and vice versa.

T lgorithm u ortional on er (PI hieve

minimum delay with zero overshot.

The following table shows both the gain and auto exposure CSR.

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

 A higher gain also produces greater image noise. This reduces image quality. For this

reason, try first to increase the brightness, using the aperture of the camera optics and/or

longer shutter settings.

8.5 Auto gain

In combination with auto white bala

When enabled auto gain adjusts the gain w

he applied a ses a prop plus integral c troll controller) to ac

0xF0F00820 GAIN Presence_Inq [0] Presence of this

feature: 0: N/A;

1: Available

Abs_Control [1] lute value

l with value

olute value

bit= 1 the

Abso

control

O: Control with valu

in the value fiel

1: Contro

in the abs

CSR

If this

MARLIN Technical Manual

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