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.

公开(公告)号：US20210276264A1

公开(公告)日：2021-09-09

申请号：US16608354

申请日：2018-03-23

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

Inventor： David A. Champion ,  Daniel Mosher ,  Brian Bay

IPC: B29C64/393 ,  B29C67/00

Abstract: According to examples, an apparatus may include a processor and a memory on which are stored machine-readable instructions that when executed by the processor, cause the processor to access a stereoscopic three-dimensional (3D) image of a layer including solidified build material particles. The instructions may also cause the processor to identify an optical property of the solidified build material particles at a location on the layer from the stereoscopic 3D image. The instructions may further cause the processor to determine whether the identified optical property exceeds a predefined threshold and based on a determination that the identified optical property exceeds the predefined threshold, output an indication that the layer includes an optical property that exceeds the predefined threshold.

公开(公告)号：US20210097669A1

公开(公告)日：2021-04-01

申请号：US16608369

申请日：2018-03-23

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

Inventor： Daniel Mosher ,  Brian Bay ,  David A. Champion

IPC: G06T7/00 ,  G06T7/174 ,  G06T7/11 ,  G06K9/46 ,  G06K9/62 ,  G06T7/593 ,  B29C64/386 ,  B33Y50/00

Abstract: According to examples, an apparatus may include a processor and a memory on which are stored machine readable instructions that when executed by the processor, cause the processor to determine whether a first surface map includes a dropout, the first surface map being generated using a first image parameter on a first image and a second image. The instructions may also cause the processor to, based on a determination that the first surface map includes a dropout, recover information corresponding to the dropout. The instructions may further cause the processor to generate a recovered surface map using the recovered information and store the recovered surface map.

公开(公告)号：US20200238625A1

公开(公告)日：2020-07-30

申请号：US16608382

申请日：2017-10-16

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

Inventor： David A Champion ,  Daniel Mosher ,  Brian Bay

IPC: B29C64/393 ,  B33Y50/02 ,  B33Y30/00

Abstract: An example method includes forming a layer of build material on a build platform of a 3-D printer and correlating X-Y position data and stereoscopic Z-position data for particles of the build material in the layer of build material that are determined to exceed a threshold criteria based on a measure attribute.

公开(公告)号：US20200213576A1

公开(公告)日：2020-07-02

申请号：US16608396

申请日：2017-09-14

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

Inventor： Daniel Mosher ,  Brian Bay ,  David A. Champion

IPC: H04N13/246 ,  H04N13/296 ,  B33Y50/02 ,  B29C64/393

Abstract: Example methods, apparatus, systems, and articles of manufacturing for calibrating a stereo vision system are described herein. An example stereo vision calibration system includes an automated calibration target stand to support a calibration target. The example stereo vision calibration system further includes a calibrator to control the automated calibration target stand to move the calibration target to a plurality of positions according to a sequence of positions while the automated calibration target stand is disposed in an additive manufacturing (AM) machine, and control a stereo vision system of the AM machine to obtain images of the calibration target in the plurality of positions.

公开(公告)号：US11801638B2

公开(公告)日：2023-10-31

申请号：US16608416

申请日：2017-08-31

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Daniel Mosher ,  Brian Bay ,  David A. Champion

IPC: B29C67/00 ,  B29C64/343 ,  B33Y50/02 ,  B29C64/393 ,  B22F10/31 ,  B22F10/28 ,  B22F12/90

CPC classification number: B29C64/343 ,  B22F10/31 ,  B29C64/393 ,  B33Y50/02 ,  B22F10/28 ,  B22F12/90

Abstract: Printers are disclosed. An example printer includes a build controller to access metrics of a layer on a work area and to select a dosing profile from a plurality of dosing profiles to fuse the layer based on the metrics.