公开(公告)号：US11494891B2

公开(公告)日：2022-11-08

申请号：US17128680

申请日：2020-12-21

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Hoon Sohn ,  Soonkyu Hwang ,  Hyeonjin Kim ,  Hyung Jin Lim

IPC: G06K9/00 ,  G06T7/00 ,  G06T7/62 ,  G06T7/11 ,  G06T7/70 ,  G06K9/62 ,  G06T5/00 ,  G06T5/20 ,  G06T11/00 ,  H04N5/30 ,  G06V10/25

Abstract: Disclosed are a method of inspecting and evaluating a coating state of a steel structure, and a system therefor. A plurality of vision images and thermal images are acquired. While acquiring the thermal images, a desired region is heated. After the thermal images and the vision images in a dynamic state are reconstructed into a time-spatial-integrated thermal image and a time-spatial-integrated vision image in a static state, respectively, an overlay image is generated by overlaying the two images. A deterioration region of a coating is detected, and coating deterioration is classified by characteristics. A size of the coating deterioration region is quantified. A thickness of the coating is inspected by analyzing thermal energy measured from the time-spatial-integrated thermal image. A coating grade is calculated by comprehensively evaluating a coating deterioration inspection result and a coating thickness inspection result. A state evaluation report for the steel structure is automatically created.

公开(公告)号：US11371839B2

公开(公告)日：2022-06-28

申请号：US16307640

申请日：2018-11-02

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Hoon Sohn ,  Soonkyu Hwang ,  Jiho Park

IPC: G01B21/08 ,  G06T5/00 ,  G06T7/00

Abstract: A method of performing visualized measurement on thickness distribution of a paint film and an apparatus therefor. A measurement target region is heated by a heating unit that applies a light beam while moving relative to the measurement target region of a measurement target structure. A sensing unit moving together with the heating unit generates a plurality of thermal images related to a phenomenon in which thermal energy is propagated in the measurement target region by scanning and photographing the heated measurement target region. The thermal images in a dynamic state are converted into time-spatial-integrated thermal images in a static state by performing coordinate transformation according to a time-spatial-integrated coordinate transformation algorithm. A thickness of the paint film is calculated by using a Fourier thermal conduction equation. A noise caused by an external heat source is removed by subtracting a pre-heating time-spatial-integrated thermal image from the converted time-spatial-integrated thermal image.

公开(公告)号：US12046167B2

公开(公告)日：2024-07-23

申请号：US16512990

申请日：2019-07-16

Applicant: Samsung Display Co., Ltd. ,  Korea Advanced Institute of Science and Technology

Inventor： Hoon Sohn ,  Sangwoo Choi ,  Minsang Koo ,  Sanghyuk Kwon ,  Eunchul Shin ,  Woojin Jung ,  Jiho Park ,  Soonkyu Hwang

IPC: G01N25/72 ,  G01N21/17 ,  G01N21/95 ,  G01N21/956 ,  G09G3/00

CPC classification number: G09G3/006 ,  G01N21/171 ,  G01N21/95607 ,  G01N25/72 ,  G01N2021/95615

Abstract: An apparatus for inspecting a display panel for defects includes a table which supports the display panel, a laser excitation unit that irradiates a non-display area of the display panel with a point laser beam, a thermal wave detecting unit that generates thermal wave images of irradiated portions of the non-display area, a driving unit, and a control unit. A groove corresponding to an edge of the display panel may be defined in a top surface of the table. A defect, such as a crack, may be detected by comparing a defect pattern obtained from the thermal wave images with a pre-registered defect pattern.

公开(公告)号：US20210223037A1

公开(公告)日：2021-07-22

申请号：US16307640

申请日：2018-11-02

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Hoon Sohn ,  Soonkyu Hwang ,  Jiho Park

IPC: G01B21/08 ,  G06T7/00 ,  G06T5/00

Abstract: A method of performing visualized measurement on thickness distribution of a paint film and an apparatus therefor. A measurement target region is heated by a heating unit that applies a light beam while moving relative to the measurement target region of a measurement target structure. A sensing unit moving together with the heating unit generates a plurality of thermal images related to a phenomenon in which thermal energy is propagated in the measurement target region by scanning and photographing the heated measurement target region. The thermal images in a dynamic state are converted into time-spatial-integrated thermal images in a static state by performing coordinate transformation according to a time-spatial-integrated coordinate transformation algorithm. A thickness of the paint film is calculated by using a Fourier thermal conduction equation. A noise caused by an external heat source is removed by subtracting a pre-heating time-spatial-integrated thermal image from the converted time-spatial-integrated thermal image.