Hardware manual

Character Contour Match Impact Reference Guide
Datalogic Automation Inc. 3-160
can enter 1”comma”000 as the verification string. Note that quotes are not used in the symbol library, but
only in strings used for training or verification.
A Setup is available for this tool, which will simplify basic configuration. Click the Setup tab to use it. (Also
see “Set up the Character Contour Match tool” on page 3-161.)
Input Name What it is
Input Image The image being inspected
Tool Origin The tool’s origin relative to the entire image space
Train Character
Rectangles
The list of rectangles that contains the contour models for training each
individual character of the Train String
Search Character
Rectangles
The list of rectangles used to search for characters during verification.
Each rectangle corresponds to a character position and should be large
enough to account for location error
Train String The string of characters that defines the characters in the Train Charac-
ter Rectangles
Verification String The string of characters to be verified. The characters in the image are
compared to model characters in this order.
Match Sensitivity Indicates how well the edges of the model and image characters must
match for success. Higher settings allow rougher edges and causes
more thorough and longer searching.
Edge Sensitivity Indicates sensitivity to edge strength in the image during tool training.
Higher settings detect more weaker edges but causes the tool to run
slower.
Fixed Edge Thresh-
old
The grey level threshold value used when Fixed Threshold is selected
for Edge Sensitivity.
Angle Range The maximum angle, in degrees, that the tool will search in the image for
a match of the trained model. The parameters are minus, nominal, plus,
include end, and include start.
Max Defect Size
List
A list of the maximum defect size allowed for each character. Each
defect size corresponds to a character in the verification string. If there
are values in this list, it is used instead of the single Max Defect Size. If
the list is too long, the extra values are ignored. If the list is too short, the
last value in the list is used to evaluate the remaining characters.
Max Defect Size The maximum defect size allowed for a single character. The defect size
is the total boundary difference between the character to be verified and
the trained model.
Min Match Score
List
Each each score in this list corresponds to a character in the verification
string. If there are values in this list, the list is used instead of the single
Min Match Score. If the list is too long, the extra scores are ignored. If
the list is too short, the last score in the list is used to evaluate the
remaining characters.
Min Match Score The closeness of the match is assigned a score from 0 to 100. If the
match score exceeds this Min Match Score value, and all defect sizes
are less than or equal to the maximum defect size, the tool passes.