公开(公告)号：US11461878B2

公开(公告)日：2022-10-04

申请号：US16933150

申请日：2020-07-20

Applicant: Quanta Computer Inc.

Inventor： Yeh Lin ,  Wen-Chu Yang ,  Chi-Hsien Yang

IPC: G06T5/00 ,  G06T5/50 ,  G02B3/08

Abstract: A method for eliminating a ring effect is provided. The method includes: capturing, by a camera, a standard ring image generated by light illuminating a standard Fresnel lens; establishing a compensation lookup table according to the standard ring image and obtaining a standard ring center point; capturing, by the camera, a ring image generated by the light illuminating a Fresnel lens to be tested; obtaining a ring center point according to the ring image; obtaining a conversion relationship between the ring center point and the standard ring center point; and performing a compensation procedure on the ring image according to the compensation lookup table and the conversion relationship to eliminate the ring effect in the ring image.

公开(公告)号：US11748856B2

公开(公告)日：2023-09-05

申请号：US17215835

申请日：2021-03-29

Applicant: Quanta Computer Inc.

Inventor： Yeh Lin ,  Wen-Chu Yang ,  Chi-Hsien Yang

IPC: G06T5/00 ,  G06T5/10 ,  H04N23/73

CPC classification number: G06T5/005 ,  G06T5/002 ,  G06T5/009 ,  G06T5/10 ,  H04N23/73 ,  G06T2207/20208

Abstract: A method for detecting defects in a near-eye display is provided. The method includes the following steps: obtaining a reference image and a DUT image according to a first image and a second image captured by a camera through a Fresnel lens when a display panel respectively displays a test-pattern image and a test-background image; performing a fast Fourier transform on the reference image and the DUT image to obtain a frequency-domain reference image and a frequency-domain DUT image; calculating an average value of pixel values above a predetermined cut-off ratio in a histogram of each first region of interest (ROI) in a filtered frequency-domain reference image as a corresponding threshold; comparing each pixel in the filtered DUT image with the corresponding threshold to generate a determination result; and building a defective-status map of the near-eye display according to the determination results.