An anchor object is a region of a fingerprint image that is used during pattern matching. If you use pattern matching to identify pages, you must specify a pattern that is unique to each fingerprint.
The process for setting up anchor objects is the same for a geometric pattern or a text-based pattern.
The coordinates of the anchor object and other information are stored in the document hierarchy. You must create a field-level object to store the details of the anchor object. Aside from the coordinates of the anchor object, the other key element is the PatternMatch variable, which identifies the object as a pattern match anchor. Additionally, you typically set the STATUS variable of the anchor object to -1 so the field is not displayed during verification.
The following example shows the XML definition of an anchor field. The anchor is created as follows:
- In Datacap Studio Document Hierarchy pane, you added a field object that is called Anchor_Object_1 to each page definition.
- The PatternMatch of the anchor object variable is set to 1 to identify the object as an anchor object.
- On the Zones tab, a recognition zone is drawn around the anchor on each of the three fingerprints in this example.
<F type="Anchor_Object_1"> <V n="ID">0</V> <V n="TYPE">Field</V> <V n="STATUS">-1</V> STATUS = -1 keeps the anchor field hidden <V n="Position">0,0,0,0</V> <V n="MIN_TYPES">0</V> <V n="MAX_TYPES">0</V> <V n="ReqConf">8</V> <V n="rules"></V> <V n="PatternMatch">1</V> PatternMatch = 1 defines the object as an anchor <V n="Pos565">183,195,276,282</V> Anchor object coordinates for fingerprint 565 <V n="Pos566">636,185,730,284</V> Anchor object coordinates for fingerprint 566 <V n="Pos567">1094,185,1181,279</V> Anchor object coordinates for fingerprint 567</F>The following image shows the anchor zone for fingerprint 565 with its offsets from the top and left edge of the page. Here a geometric pattern is used, but the process is the same for text-based patterns.
