Patents by Inventor Pei-Shan Tsai

Pei-Shan Tsai 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).

  • Low-backlight image visibility enhancement method and system
    Patent number: 8026935
    Abstract: A low-backlight image visibility enhancement method and system is proposed for integration to a backlit type of display unit, such as active matrix LCD (Liquid Crystal Display). The proposed method and system firstly converts the image of each video frame into a brightness-based grayscale image; then decomposes the grayscale image into a low-pass base layer and a high-pass detail layer; and then performs a brightness compensation for the base-layer image and a contrast enhancement for the detail-layer image; and finally combines the two image layers into one single image and performs color conversion to the combined image. The resulted image is then used for display on the display unit. This feature allows the display unit to use a low level of backlight to save electrical power consumption while nevertheless allow the image to be displayed with good visibility.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: September 27, 2011
    Assignee: National Taiwan University
    Inventors: Pei-Shan Tsai, Homer H. Chen, Chia-Kai Liang
  • LOW-BACKLIGHT IMAGE VISIBILITY ENHANCEMENT METHOD AND SYSTEM
    Publication number: 20090184915
    Abstract: A low-backlight image visibility enhancement method and system is proposed for integration to a backlit type of display unit, such as active matrix LCD (Liquid Crystal Display). The proposed method and system firstly converts the image of each video frame into a brightness-based grayscale image; then decomposes the grayscale image into a low-pass base layer and a high-pass detail layer; and then performs a brightness compensation for the base-layer image and a contrast enhancement for the detail-layer image; and finally combines the two image layers into one single image and performs color conversion to the combined image. The resulted image is then used for display on the display unit. This feature allows the display unit to use a low level of backlight to save electrical power consumption while nevertheless allow the image to be displayed with good visibility.
    Type: Application
    Filed: June 30, 2008
    Publication date: July 23, 2009
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: Pei-Shan Tsai, Homer H. Chen, Chia-Kai Liang