The pattern matching algorithms don't work on anything other than 8 bit images. You will need to convert your images to 8 bit before using pattern matching.
A word of warning: The default settings for pattern matching in Vision Builder 6.1 are quite different from the settings for VB 6.0. You can get very different results in the two versions. These settings can't be changed in VB, but can be changed in LabVIEW.
Bruce
Bruce Ammons
Ammons Engineering