Patents Assigned to Cognex Corporation
  • Patent number: 10846563
    Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to test a pose of a model in three-dimensional data. Three-dimensional data of an object is received, the three-dimensional data comprising a set of data entries. The three-dimensional data is converted to a field comprising a set of cells that each have an associated value, comprising determining, for each cell value, representative data based on one or more data entries from the set of data entries of the three-dimensional data. A pose of the model is tested with the field to determine a score for the pose.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: November 24, 2020
    Assignee: Cognex Corporation
    Inventors: Zihan Hans Liu, Nathaniel Bogan, Andrew Hoelscher
  • Patent number: 10832023
    Abstract: This invention provides a vision system, typically having at least two imaging systems/image sensors that enable a multi-function unit. The first imaging system, typically a standard, on-axis optical configuration can be used for long distances and larger feature sets and the second imaging system is typically an extended-depth of focus/field (DOF) configuration. This second imaging system allows reading of smaller feature sets/objects and/or at shorter distances. The reading range of an overall (e.g.) ID-code-reading vison system is extended and relatively small objects can be accurately imaged. The extended-DOF imaging system sensor can be positioned with its longest dimension in the vertical axis. The system can allow vision system processes to compute the distance from the vision system to the object to generate an autofocus setting for variable optics in the standard imaging system. An aimer can project structured light onto the object surface around the system optical axis.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: November 10, 2020
    Assignee: Cognex Corporation
    Inventors: Esther Oteo Lozano, Laurens Nunnink
  • Patent number: 10830927
    Abstract: This invention provides a vision system that is arranged to compensate for optical drift that can occur in certain variable lens assemblies, including, but not limited to, liquid lens arrangements. The system includes an image sensor operatively connected to a vision system processor, and a variable lens assembly that is controlled (e.g. by the vision processor or another range-determining device) to vary a focal distance thereof. A positive lens assembly is configured to weaken an effect of the variable lens assembly over a predetermined operational range of the object from the positive lens assembly. The variable lens assembly is located adjacent to a front or rear focal point of the positive lens. The variable lens assembly illustratively comprises a liquid lens assembly that can be inherently variable over approximately 20 diopter. In an embodiment, the lens barrel has a C-mount lens base.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: November 10, 2020
    Assignee: Cognex Corporation
    Inventor: Laurens Nunnink
  • Patent number: 10823552
    Abstract: A 3D measurement method including; projecting a pattern sequence onto a moving object; capturing a first image sequence with a first camera and a second image sequence synchronously to the first image sequence with a second camera; determining corresponding image points in the two sequences; computing a trajectory of a potential object point from imaging parameters and from known movement data for each pair of image points that is to be checked for correspondence. The potential object point is imaged by both image points in case they correspond. Imaging object positions derived therefrom at each of the capture points in time into image planes respectively of the two cameras. Corresponding image points positions are determined as trajectories in the two cameras and the image points are compared with each other along predetermined image point trajectories and examined for correspondence; lastly performing 3D measurement of the moved object by triangulation.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: November 3, 2020
    Assignee: Cognex Corporation
    Inventor: Bastian Harendt
  • Patent number: 10825199
    Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to test a pose of a model to image data. Image data of an object is received, the image data comprising a set of data entries. A set of regions of the image data are determined, wherein each region in the set of regions comprises an associated set of neighboring data entries in the set of data entries. Processed image data is generated, wherein the processed image data comprises a set of cells that each have an associated value, and generating the processed image data comprises, for each region in the set of regions, determining a maximum possible score of each data entry in the associated set of neighboring data entries from the image data, setting one or more values of the set of values based on the determined maximum possible score, and testing the pose of the model using the processed image data.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: November 3, 2020
    Assignee: Cognex Corporation
    Inventors: Nathaniel Bogan, Zihan Hans Liu
  • Patent number: 10812778
    Abstract: This invention provides a system and method for concurrently (i.e. non-serially) calibrating a plurality of 3D sensors to provide therefrom a single FOV in a vision system that allows for straightforward setup using a series of relatively straightforward steps that are supported by an intuitive graphical user interface (GUI). The system and method requires minimal data input about the scene or calibration object used to calibrate the sensors. 3D features of a stable object, typically employing one or more subobjects, are first measured by one of the image sensors, and then the feature measurements are used in a calibration in which each of the 3D sensors images a discrete one of the subobjects, resolves features thereon and computes a common coordinate space between the plurality of 3D sensors. Sensor(s) can be mounted on the arm of an encoderless robot or other conveyance and motion speed can be measured in setup.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: October 20, 2020
    Assignee: Cognex Corporation
    Inventors: Ruibing Wang, Aaron S. Wallack, David J. Michael, Hongwei Zhu
  • Patent number: 10812727
    Abstract: Systems and methods are provided for acquiring images of objects using an imaging device and a controllable mirror. The controllable mirror can be controlled to change a field of view for the imaging device, including so as to acquire images of different locations, of different parts of an object, or with different degrees of zoom.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: October 20, 2020
    Assignee: Cognex Corporation
    Inventors: Torsten Kempf, Saul Sanz Rodriguez, Pepe Fernandez-Dorado, Laurens Nunnink
  • Patent number: 10803622
    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: May 24, 2019
    Date of Patent: October 13, 2020
    Assignee: Cognex Corporation
    Inventors: Aaron Wallack, John Filhaber, George Costigan
  • Patent number: 10795060
    Abstract: This invention provides a vision system that is arranged to compensate for optical drift that can occur in certain variable lens assemblies, including, but not limited to, liquid lens arrangements. The system includes an image sensor operatively connected to a vision system processor, and a variable lens assembly that is controlled (e.g. by the vision processor or another range-determining device) to vary a focal distance thereof. A positive lens assembly is configured to weaken an effect of the variable lens assembly over a predetermined operational range of the object from the positive lens assembly. The variable lens assembly is located adjacent to a front or rear focal point of the positive lens. The variable lens assembly illustratively comprises a liquid lens assembly that can be inherently variable over approximately 20 diopter. In an embodiment, the lens barrel has a C-mount lens base.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: October 6, 2020
    Assignee: Cognex Corporation
    Inventors: Laurens Nunnink, Esther Oteo Lozano, Jose Fernandez Dorado
  • Patent number: 10791277
    Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to determine parameters for image acquisition. One or more image sensors are each arranged to capture a set of images of a scene, and each image sensor comprises a set of adjustable imaging parameters. A projector is configured to project a moving pattern on the scene, wherein the projector comprises a set of adjustable projector parameters. The set of adjustable projector parameters and the set of adjustable imaging parameters are determined, based on a set of one or more constraints, to reduce noise in 3D data generated based on the set of images.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: September 29, 2020
    Assignee: Cognex Corporation
    Inventors: Robert Wolff, Thomas Penny, Marcus Große
  • Publication number: 20200302138
    Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to decode a symbol in a digital image. A digital image of a portion of a symbol is received, which includes a grid of pixels and the symbol includes a grid of modules. A spatial mapping is determined between a contiguous subset of modules in the grid of modules to the grid of pixels. Causal relationships are determined, using the spatial mapping, between each module and the grid of pixels. A set of valid combinations of values of neighboring modules in the contiguous subset of modules are tested against the grid of pixels using the causal relationships. A value of at least one module of the two or more neighboring modules is determined based on the tested set of valid combinations. The symbol is decoded based on the determined value of the at least one module.
    Type: Application
    Filed: March 23, 2020
    Publication date: September 24, 2020
    Applicant: Cognex Corporation
    Inventors: Ivan Bachelder, James A. Negro
  • Publication number: 20200293731
    Abstract: Embodiments related to local tone mapping for symbol reading. A local pixel neighborhood metric is determined for at least one raw pixel in a region-of-interest, which identifies on one or more raw pixels near the at least one raw pixel. A local mapping function is determined for the at least one raw pixel that maps the value of the raw pixel to a mapped pixel value with a mapped bit depth that is smaller than the bit depth associated with the raw image. The local mapping function is based on a value of at least one other raw pixel near the at least one raw pixel within the local pixel neighborhood metric, and at least one parameter determined based on the raw image. A mapped image is computed for the region-of-interest by applying the local mapping function to the raw image.
    Type: Application
    Filed: March 30, 2020
    Publication date: September 17, 2020
    Applicant: Cognex Corporation
    Inventors: Chen Gao, Irvan Bachelder
  • Patent number: 10776972
    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: Grant
    Filed: April 25, 2018
    Date of Patent: September 15, 2020
    Assignee: Cognex Corporation
    Inventors: James A. Negro, Xiangyun Ye, Ahmed El-Barkouky
  • Patent number: 10775160
    Abstract: This invention provides a system for measuring displacement of an object surface having a displacement sensor that projects a line on the object surface and receives light from the projected line at an imager in a manner defines a plurality of displacement values in a height direction. A vision system processor operates on rows of imager pixels to determine a laser line center in columns of imager pixels in each of a plurality of regions of interest. Each region of interest defines a plurality of rows that correspond with expected locations of the projected line on the object surface. A GUI can be used to establish the regions. In further embodiments, the system generates grayscale images with the imager. These grayscale images can be compared to a generated height image to compensate for contrast-induced false height readings. Imager pixels can be compared to a reference voltage to locate the line.
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: September 15, 2020
    Assignee: Cognex Corporation
    Inventors: Robert A. Wolff, Michael C. Moed, Mikhail Akopyan, Robert Tremblay, Willard Foster, Aaron S. Wallack
  • Patent number: 10769776
    Abstract: A system and method for scoring trained probes for use in analyzing one or more candidate poses of a runtime image is provided. A set of probes with location and gradient direction based on a trained model are applied to one or more candidate poses based upon a runtime image. The applied probes each respectively include a discrete set of position offsets with respect to the gradient direction thereof. A match score is computed for each of the probes, which includes estimating a best match position for each of the probes respectively relative to one of the offsets thereof, and generating a set of individual probe scores for each of the probes, respectively at the estimated best match position.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: September 8, 2020
    Assignee: Cognex Corporation
    Inventor: Nathaniel R. Bogan
  • Patent number: 10753726
    Abstract: This invention provides a system and method for selecting the correct profile from a range of peaks generated by analyzing a surface with multiple exposure levels applied at discrete intervals. The cloud of peak information is resolved by comparison to a model profile into a best candidate to represent an accurate representation of the object profile. Illustratively, a displacement sensor projects a line of illumination on the surface and receives reflected light at a sensor assembly at a set exposure level. A processor varies the exposure level setting in a plurality of discrete increments, and stores an image of the reflected light for each of the increments. A determination process combines the stored images and aligns the combined images with respect to a model image. Points from the combined images are selected based upon closeness to the model image to provide a candidate profile of the surface.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: August 25, 2020
    Assignee: Cognex Corporation
    Inventors: David Y. Li, Li Sun, Lowell D. Jacobson, Lei Wang
  • Patent number: 10755062
    Abstract: Evaluating a symbol on an object can include acquiring a first image of the object, including the symbol. A second image can be derived from the first image based upon determining a saturation threshold for the second image and possibly scaling of pixel values to a reduced bit-depth for the second image.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: August 25, 2020
    Assignee: COGNEX CORPORATION
    Inventor: Glenn Spitz
  • Patent number: 10754122
    Abstract: An electronic device includes an electronic circuit board containing a processing element and a vision sensor. A carrier frame is used to support the electronic circuit board. An optical element is positioned over the sensor and supported by the carrier frame. The electronic circuit board is bent to reduce the length, thickness and/or width of the electronic device, without increasing the others of the length, thickness and/or width of the electronic device.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: August 25, 2020
    Assignee: COGNEX CORPORATION
    Inventors: Kai Flugge, Laurens Nunnink, Richard Reuter, David R. King
  • Patent number: 10757394
    Abstract: This invention provides a system and method for concurrently (i.e. non-serially) calibrating a plurality of 3D sensors to provide therefrom a single FOV in a vision system that allows for straightforward setup using a series of relatively straightforward steps that are supported by an intuitive graphical user interface (GUI). The system and method requires minimal input significant data about the imaged scene or calibration object used to calibrate the sensors, thereby effecting a substantially “automatic” calibration procedure. 3D features of a stable object, typically employing a plurality of 3D subobjects are first measured by one of the plurality of image sensors, and then the feature measurements are used in a calibration in which each of the 3D sensors images a discrete one of the subobjects, resolves features thereon and computes a common coordinate space between the plurality of 3D sensors. Laser displacement sensors and a conveyor/motion stage can be employed.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: August 25, 2020
    Assignee: Cognex Corporation
    Inventors: Ruibing Wang, Aaron S. Wallack, David J. Michael, Hongwei Zhu
  • Patent number: 10754071
    Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: August 25, 2020
    Assignee: COGNEX CORPORATION
    Inventors: Laurens Nunnink, Mario Joußen