Chapter
3
Advanced Tool Tutorials
3-28
Getting Started with Visionscape GigE Cameras
Optimizations for Speed
•
Minimum Edge Strength — Increasing this parameter may speed
performance if the image contains edges of less strength than the
Data Matrix edges.
•
Samples per Matrix Cell — This will be set to the lower of five or the
number of pixels per cell. Lowering this number will speed the
algorithm processing.
•
Search Speed — This parameter can be increased to Turbo to
increase algorithm speed. Typically, this will adversely affect
robustness.
•
Warp Method — If the Data Matrix is perpendicular to the camera and
there is little optical distortion, then the Fast option may be safely
selected here without affecting robustness.
Optimization for Robustness
•
Finetune Method
–
Selecting Intensity Enhance will increase robustness for matrices
of very low (<40 gray scales between foreground and
background) contrast.
–
Selecting No Quiet Zone Clutter will enhance the performance of
the tool should there be little quiet zone around the matrix.
–
Selecting Position Enhance is advisable for matrices created by
ink jet or dot peen where the center of the matrix varies greatly
from the ideal center location.
•
Robust Locate — When enabled, this algorithm will retry up to two
additional times with slightly different parameters. This will generally
increase the time the algorithm runs and may cause the tool to run
longer than the timeout value.
•
Threshold Method — Selecting all three threshold methods will
generally increase the robustness of the matrix readings and will
typically only marginally affect speed.
