Dek-265GSX-User-Manual - 第92页
Target Level Higher individuality of an image within the Video Model Box decreases the search time by limiting the number of possible targets: Here there is little confusion as to which images are located and with a high…
Fine And Course
Features
As with fiducials, areas of a board selected as a Video Model should have shapes
with a solid consistent tone within the boundaries ( course features ) and not
shapes with inner lines or lettering (fine features):
Positional
Information
When selecting a Video Model, if the image shapes have edges all in the X
direction or all in the Y direction, not enough positional information exists for
the camera system. An image with good X and Y information is necessary for
accurate positioning:
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STAGE 7
Model with
Fine Features
Model with
Course Features
No Positional information
in the X direction
No positional information
in the Y direction
Equal positional information
in the X and Y directions.
Target Level Higher individuality of an image within the Video Model Box decreases the
search time by limiting the number of possible targets:
Herethereis little confusion as to which images are located and withahighscore
in this instance the Target Score could be set as low as 800 (Accept Score is set
less than or equal to Target Score).
Here the confusion is greater, which is likely to cause several best fits to be
above the Accept Score, eg 970, 780 and 630. This would require the Target
Score to be set around 830. Setting a higher Target Score increases the search
time but ensures the correct fiducial is chosen.
Preparing the Vision System
The vision system learns the fiducial during a board setup. The fiducial
co-ordinates are entered into the product file during the editing of a default file.
This enables the camera to find the fiducials initially. The setup needs to be run
in step mode from the status page.
The following procedure is typical for all fiducial shapes, although in this
instance a circle fiducial shape is referred to throughout.
1.76 User Manual Software Version 6
MACHINE PROGRAMMING
STAGE 7
Video Model
The procedure for creating a video model is very similar to that for a
fiducial, throughout this following fiducial procedure, boxes like this
contain alternative procedure steps, to allow the setup of a video model.
1.
Select Mode (F1) till Step is indicated in the mode option on the screen.
Mode
2.
Select Exit (F8).
Exit
3. Place the board on to the conveyor.
4.
Select Run (F1).
Run
5.
Select Auto Board (F1).
Auto
Board
6.
Select Step (F1).
Step
7.
Select Step (F1).
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STAGE 7