| 摘要 |
<p>An inspection device for an apparatus for and methods of inspecting objects, such as glass bottles for defects includes an interface circuit (18) receiving data signals, typically in digital series form from a photodiode camera (10) which scans the object, and includes a latch (50) for storing one of the digital signals, and a pair of adders (52, 64). Each data signal is compared to the preceding data signal from latch (50) in one of the adders (52, 64) to generate a difference signal. Each difference signal is compared with a selected stored threshold signal in the other adder to generate an event signal representing this difference. Processing means includes master control means (28) for alternately connecting control units (20, 22) to the interface means (18) whereby one unit receives a group of the event signals representing one object while the other is processing a preceding group. Event magnitudes are compared with predetermined values. The event signals are displayed as a two-dimensional representation of the unwrapped surface. <IMAGE></p> |
