User`s manual

AW00049313000 Spatial Correction on Color Cameras

Basler runner 139

Sensor Perpendicularity

The sensor lines in the camera must be perpendicular to the conveyor’s line of travel. If the sensor

lines are not perpendicular to the line of travel, a slightly different area of the object will fall on each

line as shown in Figure 53. This situation will cause haloing that is perpendicular to the transport

direction. The halos will be constant in size. The color of the halo visible on one side of the elements

in the acquired image will be different from the color of the halo on the other side. For example,

lettering in the acquired image may show orange colored halos on the left side of each letter and

blue colored haloes to the right side of each letter.

The color chart in Figure 54 shows the halo colorations associated with different degrees of non-

perpendicularity. These halos will be apparent at black-to-white transitions.

Fig. 53: Sensor Perpendicularity

Fig. 54: Halo Colorations for Various Degrees of Non-perpendicularity

Yes No

Sensor

Conveyor

Object

Edge of

Object

90°

3.5°

2.5°

3.0°

2.0°

0.25°

0.5°

1.0°

1.5°