Patents by Inventor Duanfeng He

Duanfeng He has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190095751
    Abstract: A method and apparatus for verifying a pattern by mapping a grid onto a template that defines a plurality of grid sections. A digital image may be taken of a container showing an identifying mark (or lack thereof). The template and/or grid may be scaled and/or translated to match a perspective of the identifying mark as depicted in the digital image. A correlation function compares individual grid sections to portions of the digital image to find portions that maximize a correlation score. Grid sections with low contrast may be skipped and/or combined with higher-contrast sections to compute a score. If a match condition is satisfied between at least some of the grid sections and the digital image of the identifying mark, the pattern has been verified.
    Type: Application
    Filed: September 25, 2017
    Publication date: March 28, 2019
    Inventor: Duanfeng He
  • Patent number: 10140257
    Abstract: A mobile device captures information from a document. The mobile device selects a template stored in a memory of the mobile device. The selected template describes data content of at least one document. The mobile device then captures an image of a document, determines that the image corresponds to one document described by the selected template by verifying that at least one first region in the image corresponds to a region of the document described by the selected template, identifies at least one region in the image that corresponds with a region in the document described by the selected template, and processes information in the identified region in the image. The mobile device then aggregates application specific information from the processed information and presents the aggregated application specific information to a user program operating on the mobile device.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: November 27, 2018
    Assignee: Symbol Technologies, LLC
    Inventors: Anu Kannan, Alan J Epshteyn, Duanfeng He
  • Patent number: 10140497
    Abstract: At least some embodiments of the present invention relate to methods for stitching barcodes captured over multiple images. In an embodiment, the method includes capturing a first and second portions of a barcode in respective images, determining a presence of a match between the two captured portions, stitching the two portions pursuant to the match, and validating the combined string with the assistance of a reference mark.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: November 27, 2018
    Assignee: Symbol Technologies, LLC
    Inventor: Duanfeng He
  • Patent number: 9798914
    Abstract: A source image having a bit depth greater than eight is captured from a moving target. The source image is processed to obtain a plurality of target images each having a bit depth of eight. A memory stores the 8-bit target images. A processor obtains statistical data about the source image, and selects one of the stored 8-bit target images based on the statistical data. A controller efficiently decodes only the selected 8-bit target image.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: October 24, 2017
    Assignee: Symbol Technologies, LLC
    Inventor: Duanfeng He
  • Patent number: 9792477
    Abstract: An array of pixels of a solid-state imaging sensor having a rolling shutter is sequentially exposed to capture images from an illuminated DPM target over successive frames for image capture by an imaging reader. The DPM target is illuminated at an elevated output power level for a fractional time period of a frame, and is not illuminated for at least a portion of a remaining time period of the frame for increased energy efficiency. Only a sub-array of the pixels is exposed during the fractional time period in which the DPM target is being illuminated at the elevated output power level.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: October 17, 2017
    Assignee: Symbol Technologies, LLC
    Inventors: Duanfeng He, Eugene B. Joseph
  • Patent number: 9721133
    Abstract: An imaging barcode scanner and method are provided. The scanner includes a housing defining a work surface, a window supported by the housing, a first array of photosensitive elements having a first field of view traversing the window and intersecting the work surface at a first angle, and a second array of photosensitive elements having a second field of view traversing the window and intersecting the work surface at a second angle. The scanner also includes a processor connected to the first and second arrays of photosensitive elements, and configured to: receive a first image of the work surface from the first array of photosensitive elements, and a second image of the work surface from the second array of photosensitive elements; register the first image with the second image; and generate an enhanced image of the work surface based on the registered first image and second image, the enhanced image having a greater pixel density than the first image and the second image.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: August 1, 2017
    Assignee: Symbol Technologies, LLC
    Inventors: Miroslav Trajkovic, Bradley S Carlson, Duanfeng He
  • Patent number: 9524411
    Abstract: A data capture terminal for, and a method of, processing a plurality of data and a symbol arranged at spaced-apart locations on a target, such as a parcel delivery label, employ a solid-state imager having an array of image sensors for capturing return light from the data and the symbol on the target over a field of view, an actuator for actuating the imager to capture the return light from the data and the symbol on the target in a single actuation, and a controller operatively connected to the actuator and the imager, for processing the return light captured by the imager from the plurality of data and the symbol. The terminal is customized by a user program that advises the controller of user-selected parameters and conditions under which the processing of the return light is to be performed.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: December 20, 2016
    Assignee: Symbol Technologies, LLC
    Inventor: Duanfeng He
  • Patent number: 9501682
    Abstract: An imaging reader is operatively connected to a host system and captures light returning from a two-dimensional symbol having encoded characters, and processes the captured light into binary data. A controller in the reader or the host system determines from the binary data if the encoded characters are encoded in accordance with a local character set that is indicative of a local language, and translates the local character set to a global character set that is indicative of multiple global languages after determining that the encoded characters are encoded in accordance with the local character set. The encoded characters are processed by the host system controller in accordance with the global character set.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: November 22, 2016
    Assignee: Symbol Technologies, LLC
    Inventor: Duanfeng He
  • Publication number: 20160210492
    Abstract: An imaging barcode scanner and method are provided. The scanner includes a housing defining a work surface, a window supported by the housing, a first array of photosensitive elements having a first field of view traversing the window and intersecting the work surface at a first angle, and a second array of photosensitive elements having a second field of view traversing the window and intersecting the work surface at a second angle. The scanner also includes a processor connected to the first and second arrays of photosensitive elements, and configured to: receive a first image of the work surface from the first array of photosensitive elements, and a second image of the work surface from the second array of photosensitive elements; register the first image with the second image; and generate an enhanced image of the work surface based on the registered first image and second image, the enhanced image having a greater pixel density than the first image and the second image.
    Type: Application
    Filed: January 21, 2015
    Publication date: July 21, 2016
    Inventors: MIROSLAV TRAJKOVIC, BRADLEY S CARLSON, DUANFENG HE
  • Patent number: 9298957
    Abstract: A method of operating a workstation includes capturing multiple monitoring images each being captured with the imaging sensor while the illumination light source is energized during one of multiple short exposure-time-periods, and detecting a checkup-condition that includes analyzing the multiple monitoring images to determine the presence of any adverse feature on workstation's window. Each of the multiple short exposure-time-periods is shorter than four times of a threshold exposure-time-period but no shorter than 25% of the threshold exposure-time-period. The threshold exposure-time-period is a minimal exposure-time-period needed for the imaging sensor to capture recognizable patterns of a barcode that is in directing contacting with the window while the illumination light source is energized.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: March 29, 2016
    Assignee: Symbol Technologies, LLC
    Inventors: Eugene B Joseph, Duanfeng He
  • Publication number: 20160034722
    Abstract: A method of operating a workstation includes capturing multiple monitoring images each being captured with the imaging sensor while the illumination light source is energized during one of multiple short exposure-time-periods, and detecting a checkup-condition that includes analyzing the multiple monitoring images to determine the presence of any adverse feature on workstation's window. Each of the multiple short exposure-time-periods is shorter than four times of a threshold exposure-time-period but no shorter than 25% of the threshold exposure-time-period. The threshold exposure-time-period is a minimal exposure-time-period needed for the imaging sensor to capture recognizable patterns of a barcode that is in directing contacting with the window while the illumination light source is energized.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 4, 2016
    Inventors: EUGENE B. JOSEPH, DUANFENG HE
  • Patent number: 9111163
    Abstract: A selected target from a picklist having a plurality of targets is electro-optically read, by image capture, over a range of working distances, by capturing an image of the picklist in the range over an imaging field of view, by storing coordinates of a trajectory of an aiming light pattern in the imaging field of view over the range, by processing the captured image along the trajectory to find and identify a target, by determining whether the target covers the trajectory, and by determining that the target is the selected target when the target at least partially covers the trajectory.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: August 18, 2015
    Assignee: Symbol Technologies, LLC
    Inventor: Duanfeng He
  • Patent number: 9092667
    Abstract: An arrangement for, and a method of, electro-optically reading forms, each form having a plurality of form fields arranged at locations relative to one another, by image capture, includes storing form templates, each template having a plurality of template fields arranged at locations relative to one another, and capturing images over a field of view. A form and a correct orientation of the form, whose image is being captured, are automatically identified by matching the locations of the form fields in the captured image of the form with the locations of the stored template fields. The form fields on the identified form in the correct orientation are thereupon processed.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: July 28, 2015
    Assignee: Symbol Technologies, LLC
    Inventors: Duanfeng He, Anu Kannan
  • Patent number: 9004363
    Abstract: An apparatus includes a diffusive plate that is substantially perpendicular to the optical axis of an imaging lens arrangement and covers a side face of a solid rectangular defining a volume space within which parts of a scan engine are deposited. The parts of the scan engine including at least the illumination light source, the imaging lens arrangement, an imaging sensor, and a controller for controlling both the illumination light source and the imaging sensor. The diffusive plate includes a first opening to allow light enter the imaging lens arrangement through the first opening. The area enclosed by the boundary of the diffusive plate substantially equal to the area of the side face of the solid rectangular.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: April 14, 2015
    Assignee: Symbol Technologies, Inc.
    Inventors: Eugene B. Joseph, Mark E. Drzymala, Duanfeng He
  • Patent number: 8973826
    Abstract: A method of imaging a target object with an imaging reader. The method includes the following: (1) detecting light from the target object through a lens arrangement with an image sensor to generate light-field data; (2) generating a stream of image data including image data representing an expected in-focus image of the target object, and (3) processing the expected in-focus image of the target object to decode a barcode on the target object. The image sensor includes an array of photosensitive elements and an array of microlenses that overlays the array of photosensitive elements located at a focus plane of the microlens.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: March 10, 2015
    Inventors: Duanfeng He, Vladimir Gurevich, David P. Goren, Nong-Qiang Fan
  • Patent number: 8960550
    Abstract: An arrangement for, and a method of, minimizing misdecodes of GS1 DataBar Limited (Databar-limited) symbols in a reader for electro-optically reading symbols of different symbologies, such as Universal Product Code (UPC) Version A (UPC-A) symbols, includes a data capture assembly for capturing light from a target symbol, and for generating an electrical signal indicative of the captured light; and a controller for processing and decoding the electrical signal, and for determining whether the decoded signal is indicative of a Databar-limited symbol, and for determining whether the decoded signal has characteristics indicative of a different symbology, such as the UPC-A symbol, to indicate whether a misdecode of the Databar-limited symbol has occurred.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: February 24, 2015
    Assignee: Symbol Technologies, Inc.
    Inventors: Dariusz J. Madej, Joseph Cai, Duanfeng He, Miroslav Trajkovic, Dayou Wang, Michelle Wang
  • Publication number: 20150040001
    Abstract: A mobile device captures information from a document. The mobile device selects a template stored in a memory of the mobile device. The selected template describes data content of at least one document. The mobile device then captures an image of a document, determines that the image corresponds to one document described by the selected template by verifying that at least one first region in the image corresponds to a region of the document described by the selected template, identifies at least one region in the image that corresponds with a region in the document described by the selected template, and processes information in the identified region in the image. The mobile device then aggregates application specific information from the processed information and presents the aggregated application specific information to a user program operating on the mobile device.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 5, 2015
    Applicant: Symbol Technologies, Inc.
    Inventors: Anu Kannan, Alan J. Epshteyn, Duanfeng He
  • Publication number: 20150034724
    Abstract: A selected target from a picklist having a plurality of targets is electro-optically read, by image capture, over a range of working distances, by capturing an image of the picklist in the range over an imaging field of view, by storing coordinates of a trajectory of an aiming light pattern in the imaging field of view over the range, by processing the captured image along the trajectory to find and identify a target, by determining whether the target covers the trajectory, and by determining that the target is the selected target when the target at least partially covers the trajectory.
    Type: Application
    Filed: July 31, 2013
    Publication date: February 5, 2015
    Applicant: SYMBOL TECHNOLOGIES, INC.
    Inventor: Duanfeng He
  • Publication number: 20150040002
    Abstract: A mobile device captures information from a document. The mobile device selects a template stored in a memory of the mobile device. The selected template describes data content of at least one document. The mobile device then captures an image of a document, determines that the image corresponds to one document described by the selected template by verifying that at least one first region in the image corresponds to a region of the document described by the selected template, identifies at least one region in the image that corresponds with a region in the document described by the selected template, and processes information in the identified region in the image. The mobile device then aggregates application specific information from the processed information and presents the aggregated application specific information to a user program operating on the mobile device.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 5, 2015
    Applicant: SYMBOL TECHNOLOGIES, INC.
    Inventors: Anu Kannan, Alan J. Epshteyn, Duanfeng He
  • Patent number: 8915442
    Abstract: An arrangement for, and a method of, enhancing performance of an imaging reader for imaging symbols to be read, include a solid-state imager supported by the reader and having an array of image sensors for capturing return light from a symbol as pixel data over a field of view, and a controller operatively connected to the imager, for mapping a virtual scan line in the field of view, for determining whether the virtual scan line extends entirely over the symbol, for remapping the virtual scan line as a remapped virtual scan line that extends entirely over the symbol upon determining that the virtual scan line extends partially over the symbol, and for decoding the pixel data that lies on the remapped virtual scan line.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: December 23, 2014
    Assignee: Symbol Technologies, Inc.
    Inventors: Joseph Cai, Duanfeng He, Dayou Wang, Michelle Wang