公开(公告)号：US11017507B2

公开(公告)日：2021-05-25

申请号：US16467146

申请日：2016-12-20

Applicant: NEC Corporation

Inventor： Madhuri Mahendra Nagare ,  Eiji Kaneko ,  Hirofumi Aoki

IPC: G06K9/34 ,  G06T5/00 ,  G06K9/38 ,  G06T5/40

Abstract: An image processing device which is capable of accurately detects and corrects areas affected by clouds even if multiple types or layers of clouds present in images, is disclosed. The device includes: a cloud spectrum selection unit for selecting at least one spectrum for each of pixels from spectra of one or more clouds present in an input image; an endmember extraction unit for extracting spectra of one or more endmembers other than the one or more clouds from those of the input image; and an unmixing unit for deriving fractional abundances of the respective spectra of one or more endmembers and a selected spectrum of one of the one or more clouds for the each of pixels in the input image.

公开(公告)号：US11227367B2

公开(公告)日：2022-01-18

申请号：US16644560

申请日：2017-09-08

Applicant: NEC Corporation

Inventor： Madhuri Mahendra Nagare ,  Hirofumi Aoki ,  Kazutoshi Sagi

IPC: G06T5/00 ,  G06T7/12

Abstract: An image processing device which is capable of accurately detect pixels covered by cloud shadows and remove effects of the cloud shadows in an images are provided. The device includes: a cloud transmittance calculation unit that calculates transmittance of the one or more clouds in an input image, for each pixel; a cloud height estimation unit that determines estimation of a height from the ground to each cloud in the input image to detect position of corresponding one or more shadows; an attenuation factor estimation unit that calculates attenuation factors for the direct sun irradiance by applying an averaging filter to the cloud transmittance calculated; and a shadow removal unit that corrects pixels affected by the one or more shadows, based on a physical model of a cloud shadow formation by employing the attenuation factors calculated and the position, and outputs an image which includes the pixels corrected.

公开(公告)号：US10650498B2

公开(公告)日：2020-05-12

申请号：US16052612

申请日：2018-08-02

Applicant: NEC Corporation

Inventor： Madhuri Mahendra Nagare ,  Eiji Kaneko ,  Masato Toda ,  Masato Tsukada

IPC: G06T5/00 ,  G06T7/90

Abstract: An image processing system includes a storage device, and a processor coupled to the storage device and configured to extract, from an input image, an aerosol spectrum across a plurality of wavelength bands of the input image. The storage device contains therein a database storing a plurality of predetermined aerosol spectra, and a plurality of corresponding values associated with an aerosol optical property at the plurality of wavelength bands. The processor is further configured to retrieve, from the database, values associated with the aerosol optical property at the plurality of wavelength bands, the retrieved values corresponding to the extracted aerosol spectrum. The processor is further configured to correct the input image, by using the retrieved values associated with the aerosol optical property at the plurality of wavelength bands, to generate a corrected image.