1. A method of inspecting the finish area of a glass container rotated at an inspection station to discriminate between a blister and a check, said method comprising: illuminating the finish area of the glass container as it is being rotated with at least one lighting device; imaging the finish area of the rotating container with a camera as the glass container is being rotated to capture objects at a predetermined number of angular increments of rotation of the glass container; defining with a control a cluster of objects captured by said camera at said predetermined number of angular increments of rotation; determining with said control whether one or more additional clusters are defined by one or more gaps having a minimum size in said cluster of objects; and characterizing with said control a cluster as a check if the farthest separated objects in the cluster are separated less than a predetermined separation of objects.