Strange behaviour of pattern matching.

[Manfred Prantl]

When using pattern matching the success of the matching process depends on the region of interest selected. That is sometimes a pattern matching operation fails when performed on the whole image or some ROI but may succeed (with a high score) when performed on a smaller ROI. Can anyone explain this behaviour and suggest a possible solution?

I'm using Pattern Matching 2 with LabView 6.1

[BruceAmmons]

I have seen this behavior before. The solution we discovered was to change a parameter for pattern matching. The problem is that I can't remember the exact details. I remember there is a vi that you specify what parameter you want to change, and what to change it to. The parameter is something about the algorithm. The default value is aggressive, and you want to change it to conservative. I hope this is enough information for you to find it.

BTW, this default was changed from pattern matching in 6.0. To have the 6.1 pattern matching behave like the old version, you have to set this parameter to conservative.

Bruce