Allied Vision Technologies MF-145B2 Manuel d'instructions télécharger pdf (Page 93)

Marlin Technical ManualV.2.7.0

Description of the data path

Sub-sampling (Marlin F-131B,

Marlin F-146C and Marlin F-201C)

What is sub-sampling?

Definition Sub-sampling is the process of skipping neighboring pixels (with the same

color) while being read out from the CMOS or CCD chip.

Which Marlin models have sub-sampling?

• All CMOS equipped Marlin models, both color and b/w have this feature

(FW > 2.03).

• The CCD models Marlin F-146C and Marlin F-201C are also equipped with

this mode, acting as a preview mode. Because it is realized digitally there

is no further speed increase.

Description of sub-sampling

Sub-sampling is used primarily for the following reasons:

• A reduction in the number of pixels and thus the amount of data while

retaining the original image area angle and image brightness

• CMOS: an increase in the frame rate.

Similar to binning mode the cameras support horizontal, vertical and h+v sub-

sampling mode.

Have a look at the following table to check availability of the different sub-sam-

pling modes (h=horizontal, v=vertical).

Format_7 Mode_1 Only Marlin F-131B: By default use Format_7 Mode_1 for

• b/w cameras: 1 out of 2 horizontal sub-sampling

• color cameras: 2 out of 4 horizontal sub-sampling

The different sub-sampling patterns are shown below.

Camera model Sub-sampling h Sub-sampling v Subsampling h+v

MF-131B Format_7 Mode_1 Format_7 Mode_2 Format_7 Mode_3

MF-146C not available not available Format_7 Mode_2

MF-201C not available not available Format_7 Mode_2

Table 34: Sub-sampling modes MF-131B, MF-146C and MF-201C

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 236 237

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Allied Vision Technologies MF-145B2 Manuel d'instructions Page 93