Epson 5 - Manual (Page 53)

ContrastTarget Property
ContrastTarget Property
Applies To
Vision Objects: Edge
Description
Sets the desired contrast for the edge search.
Usage
VGet Sequence.Object.ContrastTarget, var
VSet Sequence.Object.ContrastTarget, value
Sequence Name of a sequence or string variable containing a sequence name.
Object Name of an object or string variable containing an object name. The object must exist in the
specified sequence.
var Integer variable that will contain the value of the property.
value Integer expression for the new value of the property.
Values
0 - 255
Default: 0 (any contrast)
Remarks
ContrastTarget is the desired difference in grayscale values between an edge and its background. Use
ContrastTarget to find weaker edges or edges at an angle. First, find the edge you want to search for and
record the Contrast result value. You may have to temoparily change the Edge object position to find it.
Next, set the ContrastTarget property to this value. Then set the ScoreWeightContrast to a higher value
then ScoreWeightStrength. This tells the Edge object to look for an edge with the desired contrast and base
the score on it.
See Also
Contrast Result, ContrastVariation Property, Edge Object
Vision Guide 5.0 Reference (Ver.5.3) Rev.1 39