Microscan Visionscape FrontRunner, User Manual

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v4.1.3, April 2012 Visionscape FrontRunner™ User’s Manual 3-1
3
C
amera
Ca
libration
3
CHAPTER 3
Camera Calibration
Calibration provides a way for measurement values in your Job to be
converted from pixels to world units (inches, millimeters, etc.). The
Calibration dialog box provides you with three options for calibrating one
or more Snapshot steps with a Job. For additional information about
calibration, see Chapter 2 of the Visionscape
®
Tools Reference.
This remainder of this chapter contains information about:
• “Using Robust Calibration” on page 3-1
• “Using Quick Calibration” on page 3-9
• “Using Previously Saved Calibration Data” on page 3-17
Using Robust Calibration
Note: Before you begin this procedure, you need a valid calibration target
similar to the one shown in Figure 3–1.
Robust Calibration uses a single Blob tool to find all of the dots on the
Calibration target. The center position of each dot, in pixels, is compared
to the position data you enter in the “Robust Calibration: Enter Cal Target
Dot Locations” screen to calculate forward and backward transform
matrices that are used to convert pixel values to world, and world values
to pixels.