Patents by Inventor HONGWU ZHAN

HONGWU ZHAN 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).

  • Patent number: 12075017
    Abstract: The present invention belongs to the field of printing, and specifically relates to a method for acquiring a color density characteristic curve in printing, including: designing a standard N-color level image of a single color channel; performing printout and scan correction on the standard N-color level image; performing edge finding operation on a corrected image; dividing the image into regions; and calculating a deviation. According to the method for acquiring a color density characteristic curve in printing by channels provided by the present invention, the color density characteristic curve of all the color channels may be obtained by sequentially using the method in the present invention on the color channels. The method in the present invention provides a basis for studying the performance of a printing system and further solving the problem of color density characteristic deviations at different positions.
    Type: Grant
    Filed: July 26, 2022
    Date of Patent: August 27, 2024
    Assignees: ZHEJIANG UNIVERSITY OF TECHNOLOGY, Zhejiang Puncher Digital Technology Co., Ltd
    Inventors: Hongwu Zhan, Fang Xu, Zhiming Li, Libin Zhang
  • Publication number: 20240022676
    Abstract: The present invention belongs to the field of printing, and specifically relates to a method for acquiring a color density characteristic curve in printing, including: designing a standard N-color level image of a single color channel; performing printout and scan correction on the standard N-color level image; performing edge finding operation on a corrected image; dividing the image into regions; and calculating a deviation. According to the method for acquiring a color density characteristic curve in printing by channels provided by the present invention, the color density characteristic curve of all the color channels may be obtained by sequentially using the method in the present invention on the color channels. The method in the present invention provides a basis for studying the performance of a printing system and further solving the problem of color density characteristic deviations at different positions.
    Type: Application
    Filed: July 26, 2022
    Publication date: January 18, 2024
    Applicants: ZHEJIANG UNIVERSITY OF TECHNOLOGY, Zhejiang Puncher Digital Technology Co., Ltd
    Inventors: Hongwu ZHAN, Fang XU, Zhiming LI, Libin ZHANG
  • Publication number: 20170136791
    Abstract: A mobile type printer and a printing method thereof are disclosed. The mobile type printer comprises a rack. The rack is equipped with a power source, a motor, a mobile device, an ink-jet printing head and a central processing unit, wherein the central processing unit comprises a mobile control unit and a printing control unit; the entire rack is moved by the mobile device to an appropriate place according to an instruction issued by the mobile control unit, ink-jet printing is conducted by the ink-jet printing head according to an instruction issued by the printing control unit; the mobile device comprises two coaxial action wheels; and the ink-jet printing head is arranged at one side of a rotation shaft, and the power source and the motor are arranged at the other side of the rotation shaft. The mobile type printer, departing from a traditional structure of a width-fixed printer, cannot only freely move on a printing medium, but also can print an image-text in any size.
    Type: Application
    Filed: July 8, 2014
    Publication date: May 18, 2017
    Inventor: HONGWU ZHAN