公开(公告)号：US20210377439A1

公开(公告)日：2021-12-02

申请号：US17332591

申请日：2021-05-27

Applicant: National Applied Research Laboratories

Inventor： Shiau-Jing Liu ,  Yu-Lin Tsai ,  Li-Fen Huang

IPC: H04N5/232 ,  G06T7/80 ,  G06T7/00

Abstract: Auto-focus method and a remote sensing satellite are disclosed. The satellite comprises at least a focal plane assembly (FPA) and a focus adjusting apparatus, the auto-focus method comprises: processing a point spread function (PSF) estimation to a multiple regions of a first image to generate multiple first estimated point spread functions; generating a first average point spread function according to the first estimated point spread functions; processing a Gaussian curve fitting to the first average PSF function and defining a first focus number; processing a PSF estimation to multiple regions of a second image to generate multiple second estimated PSF functions; generating a second average point spread function according to the second estimated point spread functions; processing a Gaussian curve fitting to the second average point spread function and defining a second focus number; and comparing the first focus number and the second focus number.

公开(公告)号：US11431888B2

公开(公告)日：2022-08-30

申请号：US17332591

申请日：2021-05-27

Applicant: National Applied Research Laboratories

Inventor： Shiau-Jing Liu ,  Yu-Lin Tsai ,  Li-Fen Huang

IPC: H04N7/18 ,  H04N5/232 ,  G06T7/80 ,  G06T7/00

Abstract: Auto-focus method and a remote sensing satellite are disclosed. The satellite comprises at least a focal plane assembly (FPA) and a focus adjusting apparatus, the auto-focus method comprises: processing a point spread function (PSF) estimation to a multiple regions of a first image to generate multiple first estimated point spread functions; generating a first average point spread function according to the first estimated point spread functions; processing a Gaussian curve fitting to the first average PSF function and defining a first focus number; processing a PSF estimation to multiple regions of a second image to generate multiple second estimated PSF functions; generating a second average point spread function according to the second estimated point spread functions; processing a Gaussian curve fitting to the second average point spread function and defining a second focus number; and comparing the first focus number and the second focus number.