SIPLACE Vision Customer_en - 第94页

Component Shapes Specific Component Shapes Shields S tudent Guide SIPLACE V ision (Customer) Component Shapes Edition 12/2008 EN 94  Filter type 250, for poor edge quality;  As in the case of the default setting, sever…

Component Shapes

Shields Specific Component Shapes

Student Guide SIPLACE Vision (Customer)

Edition 12/2008 EN Component Shapes

5.3.11.2 Special Features for Shields

 Shields are sheet metal with curved edges in a wide range of body shapes, some with openings/

holes drilled through; inner and outer corners and various opening angles.

 The evaluation times increase with the programmed angle tolerances.

 Various corner filters: four corner filter types are possible, depending on the different shield edges

used.

 Filter type 248 e.g. for edge springs;

 Default setting: Several position candidates

are permitted for each edge, although each

candidate must be above the gradient

threshold. Each edge is also subjected to an

additional scan. This singles out poor quality

edges, primarily candidates caused by

springs.

 Filter type 249, for good edge quality;

 Outer edge: Always takes the outermost

position (as seen when looking from outside

the component) above the gradient threshold

(in the case of double edges, caused by

indentations in the Shield and steep

illumination). The system only considers

edges which are within the yellow search

frame.

Component Shapes

Specific Component Shapes Shields

Student Guide SIPLACE Vision (Customer)

Component Shapes Edition 12/2008 EN

 Filter type 250, for poor edge quality;

 As in the case of the default setting, several

candidates are possible. However, in this

case, an additional scan is not performed

(suitable for Shields with poor edge quality.

The edge in the diagram shown has both bright

and dark points).

 Filter type 251, for double edges caused by

springs or recesses;

 Binary diagram: automatically determines a

suitable gray value threshold for binarization of

the image. A binarized image only has two

gray values: 0 and 255. Edge recognition in the

binary image is performed with an additional

scan (for Shields with springs and double

edges caused by shield indentations and

steep illumination. The bottom part of the

shield in the diagram has protruding elements,

which the measuring result is not supposed to

determine, and a double edge). If this filter type

is needed for a corner, we advise you to set it

for all corners. This means that the position is

determined in the same manner for all corners,

increasing measurement accuracy.

Component Shapes

Optical Recognition of Shields Specific Component Shapes

Student Guide SIPLACE Vision (Customer)

Edition 12/2008 EN Component Shapes

5.3.12 Optical Recognition of Shields

The shield centering procedure determines the CO center position, based on corner recognition data.

A.) Coarse and

B.) Fine centering.

If no circles or similar are programmed, further component inspections will not be performed.

Coarse centering outer corner

As can be seen in the camera gray image, the

system searches for the brighter edge, from

outside.

Taken from below, these camera images usually

have a double edge at the outer corners. The

vertical sheet trim (arrow) forms the body height

and can be clearly recognized on both sides of the

corner, due to the corner recesses in the shield

cover.

On the horizontal side of the corner, the double

edge only covers 1.4 mm.

The defined image pairs are used to determine the

dark background (blue cross) and the

lighter CO body (blue ring).

Coarse centering inner corner

This double inner corner with corner protrusion

and slant will not be programmed, as the leg

lengths are too short. We recommend that you

create the distance between corners 2 mm greater

than the corner protrusion.

The vertical recognition line is set to the shortest

possible length of 1.8 mm (six image pairs with

minimum pitch).