Horizon UserManualV6.pdf - 第92页
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 a…
Histogram The histogram gives a graphical representation of the grey scale values within
the box set around the fiducial. As can be seen there are two peaks which
represent the light and dark areas of the picture. Ideally there should be two
distinct peaks, the separation of which can be changed by varying the lighting
levels.
Experience of changing these parameters, while viewing the histogram,
demonstrates their effects.
Optimizing a
Video Model
When using a Video Model, selection of a good image shape is critical. The
following are some basic guidelines for selection of an optimum image.
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):
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Black
%Area
Within Box
Mid Grey
White
Darker Lighter
Model with
Fine Features
Model with
Course 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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No Positional information
in the X direction
No positional information
in the Y direction
Equal positional information
in the X and Y directions.
Preparing the Vision System
The vision system learns the fiducial during a board setup. The fiducial
coordinates 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.
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
Load
Data
Edit
Data
Setup
Squeegee
Change
Screen
Change
Tooling
Change
Language
Exit
2. Select Exit (F8).
Mode Load
Data
Edit
Data
Setup
Squeegee
Change
Screen
Change
Tooling
Change
Language
Exit
3. Place the board on to the conveyor.
4. Select Run (F1).
Run
Open
Cover
Paste
Load
Clean
Screen
Adjust Setup Monitor Maint.
5. Select Auto Board (F1).
Auto
Board
Manual
Board
Knead
Paste
Exit
6. Select Step (F1).
Step
Head Inspect
Setup
Single Exit
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