Microscan Visionscape FrontRunner - The Snapshot Step; The Vision System Step

Chapter 2 FrontRunner™
2-8 Visionscape FrontRunner™ User’s Manual v4.1.3, April 2012
Acquire and Snapshot. For complete information about the Acquire step,
see Chapter 1 of the Visionscape
®
Tools Reference.
The Snapshot Step
After the Acquire step acquires images, the Snapshot step pulls the
image frames from the frame datum list and passes them on to the vision
tools in the inspection for further processing.
When steps are inserted into a Snapshot, all their input buffer datums are
automatically connected to the output buffer datum of Snapshot. The
output buffer datum of Snapshot is the last image acquired. These steps
then process or analyze this image.
The Snapshot step also defines a point of calibration in the step tree.
When calibrated, the Snapshot contains a special Part tree that defines
the calibration data. A typical calibration Job is simply a Blob Step. The
Blob Step is used by the Calibration Manager to find the calibration blobs
in the image and update its “PhysCalDots” Point List datum, calculate the
calibration matrices, then update the Calibration Result Datum in the
Snapshot. The Calibration Result Datum (“CalResult”) contains the mean
and max residuals, the pixels per unit and units per pixel in x and y, the
camera angle, and the UX and VY perspectives. For complete information
about the Snapshot step, see Chapter 1 of the Visionscape
®
Tools
Reference.
The Vision System Step
The Vision System step represents the vision system device that
performs the inspection and can be a Smart Camera, GigE Camera, or
software system. Some features, which you can configure, include:
•Buffer counts
• Camera selection
• Digitizer and digitizer mode
• I/O point configuration
A Vision System step is always created with an Inspection step, which
represents an inspection task. You can add additional inspection steps.
Multiple inspection steps are necessary when an application has to
support multiple asynchronous inspections.