Presence/Absence Tools - Blob 

The Blob Presence/Absence Tool determines whether or not a blob feature is present or absent. If the Blob is detected, the tool reports "Present" and the tool result is Pass. If the Blob is not detected, or the blob detected falls outside of the specified limits, the tool result is Fail.

The Blob Presence/Absence Tool is one of the faster tools, with the ability to locate blob features much quicker than a Pattern Presence/Absence Tool. This tool is useful in situations where you are trying to verify the presence or absence of a feature made up of connected pixels. For example, verifying whether or not a hole on a stamped metal part is present.