Patents Assigned to Cognex Corporation
  • Patent number: 10482302
    Abstract: A method and apparatus for decoding codes applied to objects for use with an image sensor that includes a two dimensional field of view (FOV), the method comprising the steps of providing a processor programmed to perform the steps of obtaining an image of the FOV and applying different decode algorithms to code candidates in the obtained image to attempt to decode the code candidates wherein the decode algorithm applied to each candidate is a function of the location of the code candidate in the FOV.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: November 19, 2019
    Assignee: Cognex Corporation
    Inventors: James A. Negro, Xiangyun Ye
  • Patent number: 10482621
    Abstract: This invention provides a system and method for estimating match of a 3D alignment pose of a runtime 3D point cloud relative to a trained model 3D point cloud. It includes scoring a match of a candidate pose of the runtime 3D point cloud relative to the trained model 3D point cloud, including a visibility check that comprises (a) receiving a 3D camera optical center (b) receiving the trained model 3D point cloud; (c) receiving the runtime 3D point cloud; and (d) constructing a plurality of line segments from the optical center to a plurality of 3D points in the 3D point cloud at the runtime candidate pose. A system and method for determining an accurate representation of a 3D imaged object by omitting spurious points from a composite point cloud based on the presence or absence of such points in a given number of point clouds is also provided.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: November 19, 2019
    Assignee: COGNEX CORPORATION
    Inventors: Andrew Hoelscher, Aaron S. Wallack, Adam Wagman, David J. Michael, Hongjun Jia
  • Patent number: 10482296
    Abstract: A code reader includes an image acquisition system to acquire a plurality of images. A sensor detects motion of the code reader, and a processor is operatively coupled to the image acquisition system and the sensor. The processor performs a plurality of steps including associating a first detected motion data with one of the plurality of acquired images; associating a second detected motion data with a subsequent one of the plurality of acquired images; attempting to decode the one of the plurality of acquired images; determining if the second detected motion data is preferred over the first detected motion data; and attempting to decode the subsequent one of the plurality of acquired images when the second detected motion data is preferred over the first detected motion data.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: November 19, 2019
    Assignee: COGNEX CORPORATION
    Inventors: Mario Joußen, Jörg Kesten, Laurens Nunnink
  • Patent number: 10477154
    Abstract: This invention provides a system and method for aligning a first work piece with an underlying second work piece in the presence of occlusion by the first work piece of critical alignment features of the second work piece. The vision system, which guides the motion of a manipulator holding the first work piece and a motion stage holding the second work piece, learns secondary alignment features at least one of the first and second work pieces. Using these secondary features, the vision system determines alignment between the work pieces and guides the manipulator and the motion stage to achieve alignment as the first work piece engages the second work piece. The secondary features are used to define a course alignment. Deterministic movements of the manipulator and/or motion stage are used to learn the relationship between the secondary and primary features. Secondary features are used to direct alignment.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: November 12, 2019
    Assignee: Cognex Corporation
    Inventors: David Y. Li, Lei Wang
  • Publication number: 20190333259
    Abstract: A system may comprise a transport device for moving at least one object, wherein at least one substantially planar surface of the object is moved in a known plane locally around a viewing area, wherein the substantially planar surface of the object is occluded except when the at least one substantially planar surface passes by the viewing area, at least one 2D digital optical sensor configured to capture at least two sequential 2D digital images of the at least one substantially planar surface of the at least one object that is moved in the known plane around the viewing area, and a controller operatively coupled to the 2D digital optical sensor, the controller performing the steps of: a) receiving a first digital image, b) receiving a second digital image, and c) stitching the first digital image and the second digital image using a stitching algorithm to generate a stitched image.
    Type: Application
    Filed: April 25, 2018
    Publication date: October 31, 2019
    Applicant: Cognex Corporation
    Inventors: James A. Negro, Xiangyun Ye, Ahmed El-BARKOUKY
  • Publication number: 20190325590
    Abstract: In some aspects, the techniques described herein relate to systems, methods, and computer readable media for data pre-processing for stereo-temporal image sequences to improve three-dimensional data reconstruction. In some aspects, the techniques described herein relate to systems, methods, and computer readable media for improved correspondence refinement for image areas affected by oversaturation. In some aspects, the techniques described herein relate to systems, methods, and computer readable media configured to fill missing correspondences to improve three-dimensional (3-D) reconstruction. The techniques include identifying image points without correspondences, using existing correspondences and/or other information to generate approximated correspondences, and cross-checking the approximated correspondences to determine whether the approximated correspondences should be used for the image processing.
    Type: Application
    Filed: April 23, 2019
    Publication date: October 24, 2019
    Applicant: Cognex Corporation
    Inventor: Marcus Große
  • Publication number: 20190325594
    Abstract: In some aspects, the techniques described herein relate to systems, methods, and computer readable media for data pre-processing for stereo-temporal image sequences to improve three-dimensional data reconstruction. In some aspects, the techniques described herein relate to systems, methods, and computer readable media for improved correspondence refinement for image areas affected by oversaturation. In some aspects, the techniques described herein relate to systems, methods, and computer readable media configured to fill missing correspondences to improve three-dimensional (3-D) reconstruction. The techniques include identifying image points without correspondences, using existing correspondences and/or other information to generate approximated correspondences, and cross-checking the approximated correspondences to determine whether the approximated correspondences should be used for the image processing.
    Type: Application
    Filed: April 23, 2019
    Publication date: October 24, 2019
    Applicant: Cognex Corporation
    Inventors: Marcus Große, Martin Schaffer, Simon Willeke
  • Publication number: 20190325598
    Abstract: In some aspects, the techniques described herein relate to systems, methods, and computer readable media for data pre-processing for stereo-temporal image sequences to improve three-dimensional data reconstruction. In some aspects, the techniques described herein relate to systems, methods, and computer readable media for improved correspondence refinement for image areas affected by oversaturation. In some aspects, the techniques described herein relate to systems, methods, and computer readable media configured to fill missing correspondences to improve three-dimensional (3-D) reconstruction. The techniques include identifying image points without correspondences, using existing correspondences and/or other information to generate approximated correspondences, and cross-checking the approximated correspondences to determine whether the approximated correspondences should be used for the image processing.
    Type: Application
    Filed: April 23, 2019
    Publication date: October 24, 2019
    Applicant: Cognex Corporation
    Inventors: Marcus Große, Martin Schaffer, Bastian Harendt
  • Patent number: 10452949
    Abstract: This invention provides a system and method for aligning first three-dimensional (3D) point cloud image representing a model with a second 3D point cloud image representing a target, using a vision system processor. A passing overall score is established for possible alignments of the first 3D point cloud image with the second 3D point cloud image. A coverage score for at least one alignment of the first 3D point cloud image with the second 3D point cloud image is estimated so that the coverage score describes an amount of desired features in the first 3D point cloud image present in the second 3D point cloud image. A clutter score is estimated so that the clutter score describes extraneous features in the second 3D point cloud image. An overall score is computed as a difference between the coverage score and the clutter score.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: October 22, 2019
    Assignee: Cognex Corporation
    Inventors: Hongjun Jia, David J. Michael, Adam Wagman, Andrew Hoelscher
  • Patent number: 10445544
    Abstract: This invention provides a field of view expander (FOVE) removably attached to a vision system camera having an image sensor defining an image plane. In an embodiment the FOVE includes first and second mirrors that transmit light from a scene in respective first and second partial fields of view along first and second optical axes. Third and fourth mirrors respectively receive reflected light from the first and second mirrors. The third and fourth mirrors reflect the received light onto the image plane in a first strip and a second strip adjacent to the first strip. The first and second optical axes are approximately parallel and a first focused optical path length between the scene and the image plane and a second focused optical path between the image plane and the scene are approximately equal in length. The optical path can be rotated at a right angle in embodiments.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: October 15, 2019
    Assignee: COGNEX CORPORATION
    Inventors: Laurens Nunnink, Carl W. Gerst, III, William Equitz, Matthew D. Engle
  • Patent number: 10438036
    Abstract: This invention provides a system and method for reading and decoding ID features located on a surface of a curved, sloped and/or annular object, such as a tire moving on a conveyor. A plurality of 3D sensors are operatively connected to a vision system processor. The sensors are calibrated by calibration parameters to generate a stitched-together 3D image of a field of view in a common coordinate space. A motion conveyance (e.g. a conveyor) causes the object and the 3D sensors to move in relative motion, and the conveyance provides motion information to the vision system processor. An ID finder locates ID features within a version of the 3D image and a decoder (e.g. an OCR reader) generates data from the ID features. The ID finder can locate a trained portion of the ID and the search for variable code elements at a known orientation relative to the trained portion.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: October 8, 2019
    Assignee: Cognex Corporation
    Inventors: Matthew R. Reome, Ali M. Zadeh, Robert A. Wolff, Ruibing Wang, Aaron S. Wallack, David J. Michael, Hongwei Zhu, Benjamin D. Klass
  • Patent number: 10421189
    Abstract: A system and method for robustly calibrating a vision system and a robot is provided. The system and method enables a plurality of cameras to be calibrated into a robot base coordinate system to enable a machine vision/robot control system to accurately identify the location of objects of interest within robot base coordinates.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: September 24, 2019
    Assignee: Cognex Corporation
    Inventors: Aaron S. Wallack, Lifeng Liu, Xiangyun Ye
  • Patent number: 10417533
    Abstract: Techniques include systems, computerized methods, and computer readable media for choosing placement of three-dimensional (3D) probes used for evaluating a 3D alignment pose of a runtime 3D image inside a 3D alignment system for estimating the pose of a trained 3D model image in that 3D runtime image. A plurality of features associated with a first plurality of points of interest from a 3D image are generated, wherein each feature includes data indicative of 3D properties of an associated point from the plurality of points of interest. A second plurality of points of interest are selected from among the first plurality of points of interest, based at least in part on the plurality of features associated with the first plurality of points of interest. Placements of a plurality of 3D probes are determined based at least in part on the second plurality of points of interest.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: September 17, 2019
    Assignee: Cognex Corporation
    Inventors: Simon Barker, Drew Hoelscher
  • Patent number: 10402962
    Abstract: A system and method for training a bead detection system can include identifying a starting region on a bead based on a starting indicator. The bead can be analyzed at the starting region to identify bead characteristics. The bead can then be analyzed away from the starting region, based on the identified bead characteristics, to identify a bead profile for use during non-training bead inspection.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: September 3, 2019
    Assignee: COGNEX CORPORATION
    Inventor: Ali Zadeh
  • Publication number: 20190251677
    Abstract: The present disclosure provides a multi-stage image mapping mechanism for mapping a distorted image to a rectified image. For example, the multi-stage image mapping mechanism can remove homography from a distorted image to reconstruct a rectified image in two-stages: (1) a first stage in which distortion is partially removed from a distorted image to generate an intermediate image, and (2) a second stage in which residual distortion is removed from the intermediate image to recover the rectified image.
    Type: Application
    Filed: April 25, 2019
    Publication date: August 15, 2019
    Applicant: Cognex Corporation
    Inventor: Nathaniel Bogan
  • Patent number: 10380764
    Abstract: This invention provides a system and method for hand-eye calibration of a vision system using an object under manufacture having at least one feature. The feature can be a linear feature and the object moves in at least one degree of freedom in translation or rotation on a motion stage. The system further comprises at least a first vision system camera and vision processor. The first vision system camera is arranged to acquire an image of the first linear feature on the object under manufacture and to track motion of the first linear feature in response to moving of the motion stage in at least one degree of translation. The first linear feature is identified in at least two different positions along a plane. The system computes a mapping between pixel positions in a pixel coordinate system of the first camera and physical positions in a motion coordinate system based upon locations of the at least two positions.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: August 13, 2019
    Assignee: Cognex Corporation
    Inventor: Gang Liu
  • Patent number: 10380767
    Abstract: A system and method for selecting among 3D alignment algorithms in a 3D vision system is provided. The system and method includes a 3D camera assembly to acquire at least a runtime image defined by a 3D point cloud or runtime 3D range image having features of a runtime object and a vision system processor. A training image is provided. It is defined by a 3D point cloud or 3D range image having features of a model. A selection process is operated by the vision processor. It analyzes at least one training region of the training image having the features of the model and determines a distribution of surface normals in the at least one training region. It also selects, based upon a characteristic of the distribution, at least one 3D alignment algorithm from a plurality of available 3D alignment algorithms to align the features of the model with respect to the features of the runtime object.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: August 13, 2019
    Assignee: Cognex Corporation
    Inventors: Simon Barker, David J. Michael
  • Patent number: 10360693
    Abstract: The present disclosure provides a high resolution structured light system that is also capable of maintaining high throughput. The high resolution structured light system includes one or more image capture devices, such as a camera and/or an image sensor, a projector, and a blurring element. The projector is configured to project a binary pattern so that the projector can operate at high throughput. The binary projection pattern is subsequently filtered by the blurring element to remove high frequency components of the binary projection pattern. This filtering smoothes out sharp edges of the binary projection pattern, thereby creating a blurred projection pattern that changes gradually from the low value to the high value. This gradual change can be used by the structured light system to resolve spatial changes in the 3D profile that could not otherwise be resolved using a binary pattern.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: July 23, 2019
    Assignee: Cognex Corporation
    Inventors: Aaron Wallack, John Filhaber, George Costigan
  • Patent number: 10346645
    Abstract: This invention provides an aimer assembly for a vision system that is coaxial (on-axis) with the camera optical axis, thus providing an aligned aim point at a wide range of working distances. The aimer includes a projecting light element located aside the camera optical axis. The beam and received light from the imaged (illuminated) scene are selectively reflected or transmitted through a dichoric mirror assembly in a manner that permits the beam to be aligned with the optical axis and projected to the scene while only light from the scene is received by the sensor. The aimer beam and illuminator employ differing light wavelengths. In a further embodiment, an internal illuminator includes a plurality of light sources below the camera optical axis. Some of the light sources are covered by a prismatic structure for close distance, and other light sources are collimated, projecting over a longer distance.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: July 9, 2019
    Assignee: COGNEX CORPORATION
    Inventors: Laurens Nunnink, Saul Sanz Rodriguez
  • Patent number: 10325129
    Abstract: A method and apparatus for decoding codes applied to objects for use with a camera and a conveyor system wherein the camera includes an image sensor having a two dimensional field of view (FOV) and the conveyor system moves objects through the FOV such that objects enter the FOV along an entry edge and exit the FOV along an exit edge, the method comprising the steps of providing a processor programmed to perform the steps of obtaining images of the FOV, for each image identifying code candidates in at least portions of the image, ordering at least a subset of the code candidates for decoding in a candidate order wherein the candidate order is determined at least in part as a function of the first direction of travel through the FOV, attempting to decode code candidates in the order specified by the direction of travel and when a new image event occurs, foregoing attempts to decode at least a portion of the identified code candidates.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: June 18, 2019
    Assignee: COGNEX CORPORATION
    Inventors: James Negro, John F. Keating, Michael C. Moed