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Controlling image capture

PIKE Technical Manual V4.0.0

200

Smear reduction

Smear reduction: definition

Definition Smear is an undesirable CCD sensor artefact creating a vertical bright line

that extends above and below a bright spot in an image.

Definition Smear reduction is a new feature of PIKE cameras: it is a function imple-

mented in hardware in the camera itself to compensate for smear.

Smear reduction: how it works

To reduce smear a reference line is used. This reference line is built from the

mean value of the so-called black lines (two lines before image start). The

reference line is subtracted from every line of the whole image.

But how will this reduce smearing?

The point is: black lines have no image information but are also affected from

smearing. Thus the smearing effect itself is isolated and can be reduced in

the whole image.

The two additional black lines and the calculated anti-smear values do not

lower the transfer rates significantly due to hardware implementation.

Smear reduction: switch on/off in register and

SmartView

To switch on/off smear reduction in advanced registers, see Chapter Smear

reduction on page 317.

In SmartView: Edit settings  Adv3 tab (Smear reduction Enable)

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Allied Vision Technologies Pike Manual de instrucciones Pagina 200