Patents by Inventor Liyan Liu

Liyan Liu 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: 20150055828
    Abstract: A moving object detection method includes acquiring two depth image frames including depth information, which are obtained by continuously taking images of a moving object, the two depth image frames including a present depth image frame and at least one past depth image frame; dividing each of the two depth image frames into a plurality of blocks; calculating differences between numbers of pixels positioned in respective different depth areas in each of the plurality of blocks in the present depth image frame, and numbers of pixels positioned in respective different depth areas in each of the corresponding plurality of blocks in each of the at least one past depth image frame, which correspond to the plurality of blocks in the present depth image frame; and detecting a moving block in the present depth image frame based on the calculated difference and constituting the detected moving object.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 26, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Ying ZHAO, Liyan LIU, Lingyan LIANG
  • Patent number: 8848980
    Abstract: A method for detecting a front vehicle comprises: a moving light detecting step of detecting a front moving light area of an own vehicle in at least one image of a front scene of the own vehicle obtained at a time; a vehicle candidate generating step of extracting a light area pair from the detected front moving light area so that a front vehicle candidate is generated; and a vehicle candidate verifying step of verifying that the front vehicle candidate is the front vehicle in cases where the front vehicle candidate meets predetermined characteristics of a vehicle light.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 30, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Cheng Du, Liyan Liu, Xiaomeng Wang, Ping Hu
  • Patent number: 8493431
    Abstract: Disclosed is a processing method used in a video conference system having a local terminal device and at least one remote terminal device, comprising a feature detection step of carrying out a feature detection in the local terminal device and the remote terminal device, respectively; a conference mode setting step of setting a conference mode for the local terminal device and the remote terminal device, respectively; and a video encoding step of dividing a video frame in the local terminal device and the remote terminal device, and then pre-processing the divided areas so as to encode the pre-processed areas, respectively.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: July 23, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Liyan Liu, Xiaomeng Wang
  • Publication number: 20130083971
    Abstract: A method for detecting a front vehicle comprises: a moving light detecting step of detecting a front moving light area of an own vehicle in at least one image of a front scene of the own vehicle obtained at a time; a vehicle candidate generating step of extracting a light area pair from the detected front moving light area so that a front vehicle candidate is generated; and a vehicle candidate verifying step of verifying that the front vehicle candidate is the front vehicle in cases where the front vehicle candidate meets predetermined characteristics of a vehicle light.
    Type: Application
    Filed: September 28, 2012
    Publication date: April 4, 2013
    Inventors: Cheng DU, Liyan LIU, Xiaomeng WANG, Ping HU
  • Publication number: 20130077830
    Abstract: Disclosed are a method and a device for detecting traffic signs in an input image camera. The method comprises a color space converting step of converting the input image into a HSV color space image; a filtering step of filtering, based on a predetermined pass range of a standard color of each of the traffic signs, the HSV color space image to obtain a filtered image, and then generating one or more connected domains based on one or more regions in the filtered image; a removing step of removing, based on a standard rule of the corresponding traffic sign, at least one of the generated connected domains, not being the corresponding traffic sign, and letting others of the generated connected domains be candidate traffic sign domains; and a recognition step of recognizing, based on a feature of each of the candidate traffic sign domains, the corresponding traffic sign.
    Type: Application
    Filed: September 10, 2012
    Publication date: March 28, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Liyan LIU, Xiaomeng WANG, Pingping PAN
  • Publication number: 20110205330
    Abstract: Disclosed is a processing method used in a video conference system having a local terminal device and at least one remote terminal device, comprising a feature detection step of carrying out a feature detection in the local terminal device and the remote terminal device, respectively; a conference mode setting step of setting a conference mode for the local terminal device and the remote terminal device, respectively; and a video encoding step of dividing a video frame in the local terminal device and the remote terminal device, and then pre-processing the divided areas so as to encode the pre-processed areas, respectively.
    Type: Application
    Filed: January 20, 2011
    Publication date: August 25, 2011
    Applicant: Ricoh Company, Ltd.
    Inventors: Liyan Liu, Xiaomeng Wang