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Method For Measuring Chroma Value By a Colorimeter

  • US 20090103075A1
  • Filed: 10/19/2007
  • Published: 04/23/2009
  • Est. Priority Date: 10/19/2007
  • Status: Active Grant
First Claim
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1. A method for measuring chroma value by a calorimeter, comprising the steps of:

  • (a) illuminating on the surface of an object with a multi-band illuminant, and wherein the multi-band illuminant comprises a plurality of single wavelength lights which is distributed in the visible light band and the multi-band illuminant individually make a plurality of different spectrum illuminants, S(λ

    )*x(λ

    ), S(λ

    )*y(λ

    ) and S(λ

    )*z(λ

    );

    (b) forming a reflective light which reflect form an illuminating light on the surface of the object, and wherein the reflective light passes through a power meter within the colorimeter;

    (c) computing an chroma value of the object by the luminous intensity which is received by the power meter, wherein the distributed spectrum illuminants, S(λ

    )*x(λ

    ), S(λ

    )*y(λ

    ) and S(λ

    )*z(λ

    ), from the multi-band illuminant illuminate on the object in turn, and to be received by the multi-band power meter after times the reflectance of the object R(λ

    ), that is the same as integration, then the X, Y, Z data are obtained, and owing to considering a frequency response of the power meter on every wavelength, multi-band illuminant is used for forming the distributed spectrum illuminants individually, S(λ

    )*x(λ

    )/PM(λ

    ), S(λ

    )*y(λ

    )/PM(λ

    ) and S(λ

    )*z(λ

    )/PM(λ

    ), that is

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