Hardware manual

Impact Reference Guide Character Contour Match
3-165 Datalogic Automation Inc.
cally. If necessary, you can click the check box and adjust the threshold option until all the module
points are marked as Found in the image.
4. When the Automatic Module Size check box is checked, the tool automatically looks for symbols with
modules of various sizes, 4, 8, 12, etc. If you enter a different module size, then the tool only looks for
codes with modules of that size. The minimum recommended module size is 3 pixels.
5. If you enter a string in the Verify String field, that string is compared to the decoded string. If the
strings do not match, the tool will fail.
How the Data Matrix tool works
This tool has the following features: Locating - Automatically locates the matrix; Distortions - Handles per-
spective distortion and sheared matrices; Automatic size detection - Detects matrix sizes automatically;
Automatic Contrast detection - Detects whether the symbol is dark on light or vice versa; No training
required - Since the matrix size and contrast are determined when the tool is run, the tool requires no train-
ing.
If you enter a number in Module Size In Pixels property, then the tool uses it to find the symbol more
quickly and reliably. If you leave the default value of 4 pixels, the tool automatically looks for symbols with
modules of various sizes, 4, 8, 12, … If you enter a different module size, then the tool only looks for codes
with modules of that size. The minimum recommended module size is 3 pixels.
The "Enable Boundary and Module Outputs" property is False by default to allow for faster reading. Change
it to true to turn on the Found Modules and Symbol Boundary outputs. Found Modules indicates where the
image was sampled and which modules were determined to be inked; from this information you can deter-
mine whether the reader had a problem with detecting contrast (fixable via morphology) or whether the sym-
bol has variable module sizes (not currently readable).
The "Symbol Boundary" gives you feedback about where the edges of the symbol were found. If the symbol
boundary doesn't appear along the edges of the symbol, the problem can probably be fixed using the Image
Sampling Tool or the Pixel Fill Tool.