182050 User manual - 第69页
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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, dem-
onstrates 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).
Black
% Area
Within Box
Mid Grey White
Model with Fine Features Model with Course Features
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Software Version 07SP02 User Manual 1.59
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:
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.
1. Select Mode (F1) until Step is indicated in the mode option on the screen.
2. Select Exit (F8).
3. Place the board onto the rails.
No Positional information
in the X direction
No positional information
in the Y direction
Equal positional information
in the X and Y directions.
Video Model
The procedure for creating a Video Model is very similar to that for creating a
Fiducial, throughout the following fiducial procedure, boxes like this contain
alternative procedure steps, to allow the setup of a Video Model.
Mode
Load
Data
Edit
Data
Setup
Squeegee
Change
Screen
Change
Tooling
Change
Language
Exit
Mode
Load
Data
Edit
Data
Setup
Squeegee
Change
Screen
Change
Tooling
Change
Language
Exit
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4. Select Run (F1).
5. Select Step (F1).
6. Select Step (F1).
The board fiducial should now be visible on the vision data window.
If the fiducial is in the field of view go to Step 10. If the fiducial is not in the
field of view, continue with Step 8.
7. Select Search Step (F5).
For each press of Search Step the camera conducts an increasing spiral
search to enable the operator to locate the fiducial. If this search is not
successful the camera can be returned to its origin. Re-check the fiducial
co-ordinates set in the product file.
8. Select Search Reset (F6).
When the fiducial is located move it to the centre of the screen.
9. Select Fiducial Setup (F3).
Run
Open
Cover
Paste
Load
Clean
Screen
Setup Monitor Maint.
Step
Open
Cover
Single Exit
Step
Open
Cover
Inspect
Setup
Single Exit
Step
Open
Cover
Fiducial
Setup
Adjust
Search
Step
Search
Reset
Single Exit
Step
Open
Cover
Fiducial
Setup
Adjust
Search
Step
Search
Reset
Single Exit
Step
Open
Cover
Fiducial
Setup
Adjust
Search
Step
Search
Reset
Single Exit