公开(公告)号：US20200232785A1

公开(公告)日：2020-07-23

申请号：US16486469

申请日：2017-04-01

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. ,  OREGON STATE UNIVERSITY

Inventor： Dan Mosher ,  Brian Bay ,  David A. Champion ,  James McKinnell

IPC: G01B11/06 ,  B29C64/393 ,  G06K9/00

Abstract: A first camera and a second camera oriented at different angles and spaced a separation distance to determine surface height measurements. The cameras are focused at a lens focal length to a surface area to record a captured image pair of x-y pixels having common features of the surface area. Correlation of the captured image pair is performed to measure a set of disparity distances between the common features in the captured image pair using a fiducial to assist. The set of disparity distances is converted to a set of z-height measurements with a resolution incorporating the separation distance, the lens focal length, the set of disparity distances, and a calibration error factor.