公开(公告)号：US20230206518A1

公开(公告)日：2023-06-29

申请号：US17927856

申请日：2021-05-28

Applicant: COLOR GRAIL RESEARCH

Inventor： Franck Philippe HENNEBELLE ,  Rémi VAUCLIN

IPC: G06T11/00

CPC classification number: G06T11/006 ,  G06T2211/416

Abstract: Disclosed is a method for reconstructing a matrix image representative of a static scene under predetermined lighting conditions, including: —acquiring images, captured by a sensor using a lighting which is separate from one image to another; and —reconstructing the matrix image, in a reconstruction space separate from a native spectral space of the sensor, by determining, for each pixel, the spectral components by weighted combination of the spectral components of the native spectral space of the image sensor, the spectral components being photometrically adjusted and associated with the same pixel of each image of the captured images. the weighting is obtained by solving a linear equation system having at least the following parameters: a predetermined value matrix associated with the predetermined lighting conditions, a matrix representative of both the spectral response of the sensor and the spectral distribution of each lighting applied to each captured image.

公开(公告)号：US20180284020A1

公开(公告)日：2018-10-04

申请号：US15764603

申请日：2016-09-30

Applicant: COLOR GRAIL RESEARCH

Inventor： Rémi VAUCLIN ,  Franck HENNEBELLE

IPC: G01N21/55 ,  G01N21/31

CPC classification number: G01N21/55 ,  G01J3/10 ,  G01J2003/425 ,  G01N21/31 ,  G01N2201/0221 ,  G01N2201/0616 ,  G01N2201/0696

Abstract: Disclosed is a method for determining the reflectance of an object, the method including a step of solving an equation having several unknowns, the equation being obtained from formed images, the reflectance of the object and the illumination of the external light source being two unknowns of the equation. The step of solving the equation includes: calculating solution points of the equation, interpolating the calculated points by way of an interpolation function, and using at least one of the following approximations to solve the equation: a first approximation according to which each image is derived from the emission of a separate light flash, a second approximation according to which the interpolation function determines the stability points of the equation.