System and method for determination of contact lens orientation

摘要

This invention provides a system and method to determine orientation/pose of a contact lens residing on the transparent bottom of a fluid-filled, typically opaque-sided cuvette. This allows the system to determine whether the subject contact lens is in a concave up or concave down orientation, and whether the lens is everted. An illuminator is aligned on a longitudinal axis of the cuvette through the contact lens at a position over the cuvette, and a vision system camera is aligned beneath the bottom of the cuvette on the axis. In alternate embodiments the axial locations of the camera and the illuminator can be varied. The camera acquires images of the contact lens. The vision system associated finds the appropriate contact lens edges and characteristics of features. These features allow each of the four poses to be distinguished and categorized for either an acceptable/good or unacceptable/bad pose within the cuvette.

主权项

1. A system for determining orientation of a contact lens residing on a bottom of a cuvette comprising:
a vision system camera oriented with a lens axis approximately aligned with a longitudinal axis of the cuvette, constructed and arranged to acquire an image of the contact lens; an edge detection vision tool that locates the contact lens in the image and that determines edges within the image; and a classifier vision tool that, based upon at least one of locations of the edges and features within the image classifies a concave and everted orientation of the contact lens relative to training information with respect to each of a plurality of predetermined contact lens orientations.