Inspection system for three-dimensional printer and methods thereof

A method of inspecting drop ejection in a printing system, comprising:

• capturing an image of each of a plurality of drops of print material after ejection from an ejector of a printing system;
• creating a temporally averaged image from each image of the plurality of drops of print material;
• extracting a region of interest (ROI) from each temporally averaged image from each image of each of the plurality of drops of print material;
• comparing the region of interest (ROI) from a first temporally averaged image to a region of interest (ROI) from a second temporally averaged image to generate a jetting result;
• and
• classifying the jetting result of one of the plurality of drops of print material.

A printing system, comprising:

• an ejector for jetting a print material, comprising:
• a structure defining an inner cavity;
• and
• a nozzle orifice in connection with the inner cavity and configured to pulse to eject one or more drops of liquid print material;
• a camera comprising a high-speed shutter wherein the shutter is synchronized to an ejector pulse;
• and
• a video analytic framework coupled to the ejector and the camera configured to generate a jetting result for each of the one or more drops of liquid print material.