Patents by Inventor Jianzhang Li

Jianzhang Li 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).

  • Auto-iris control method
    Patent number: 9866763
    Abstract: An auto-iris control method, including setting a target luminance value of an auto iris; collecting an image at a current moment and calculating a luminance value of the image collected at the current moment; comparing the target luminance value with the luminance value of the image collected at the current moment; comparing an absolute value of the luminance difference at the current moment with a preset luminance difference threshold, determining a status of the auto iris at the current moment, and using a corresponding proportional-integral-derivative (PID) algorithm to calculate a direct current control voltage at the current moment; and adjusting an action of the auto iris according to the calculated direct current control voltage.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: January 9, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Tao Huang, Jianzhang Li
  • Auto-Iris Control Method
    Publication number: 20160105595
    Abstract: An auto-iris control method, including setting a target luminance value of an auto iris; collecting an image at a current moment and calculating a luminance value of the image collected at the current moment; comparing the target luminance value with the luminance value of the image collected at the current moment; comparing an absolute value of the luminance difference at the current moment with a preset luminance difference threshold, determining a status of the auto iris at the current moment, and using a corresponding proportional-integral-derivative (PID) algorithm to calculate a direct current control voltage at the current moment; and adjusting an action of the auto iris according to the calculated direct current control voltage.
    Type: Application
    Filed: December 18, 2015
    Publication date: April 14, 2016
    Inventors: Tao Huang, Jianzhang Li