Goniometers (go1b 9/10) Patents (Class 356/907)
  • Process for generating bidirectional reflectance distribution functions of gonioapparent materials with limited measurement data
    Patent number: 8374831
    Abstract: A computer-implemented process for generating a bidirectional reflectance distribution function (BRDF) of a gonioapparent material containing effect flake pigments in a solid medium using limited measurement data, comprising the following steps: (A) acquiring and inputting into a computing device (1) photometric data and (2) the refractive index of the solid medium of the gonioapparent material; (B) converting any non-linear photometric data from step A) above to linear photometric data; (C) using the illumination angle and the reflective scattering angle associated with the linear photometric data and the refractive index of the medium to calculate corresponding effect flake angles; (D) fitting the linear photometric data and the effect angle data with an equation; (E) calculating the corresponding effect flake angle needed to calculate the BRDF being generated in step (F); and (F) generating the BRDF from the corresponding effect flake angle from step (E) and the equation developed in step (D).
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: February 12, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventor: Larry Eugene Steenhoek
  • Process for generating bidirectional reflectance distribution functions of gonioapparent materials with limited measurement data
    Patent number: 8103491
    Abstract: This disclosure is directed to a method for matching color and appearance of an object. The method comprise the step of generating a bidirectional reflectance distribution function (BRDF) of a gonioapparent material containing effect flake pigments in a solid medium using limited measurement data.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: January 24, 2012
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Larry Eugene Steenhoek
  • Process for generating bidirectional reflectance distribution functions of gonioapparent materials with limited measurement data
    Patent number: 7991596
    Abstract: A computer-implemented process for generating a bidirectional reflectance distribution function (BRDF) of a gonioapparent material containing effect flake pigments in a solid medium using limited measurement data, comprising the following steps: (A) acquiring and inputting into a computing device (1) photometric data and (2) the refractive index of the solid medium of the gonioapparent material; (B) converting any non-linear photometric data from step A) above to linear photometric data; (C) using the illumination angle and the reflective scattering angle associated with the linear photometric data and the refractive index of the medium to calculate corresponding effect flake angles; (D) fitting the linear photometric data and the effect angle data with an equation; (E) calculating the corresponding effect flake angle needed to calculate the BRDF being generated in step (F); and (F) generating the BRDF from the corresponding effect flake angle from step (E) and the equation developed in step (D).
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: August 2, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Larry Eugene Steenhoek