US 8,009,906 B2 · Spectral gamut mapping based on a colorimetric gamut mapping

Abstract

Mapping spectral colors in an Interim Connection Space (ICS) of a full spectral space based on a colorimetric gamut map in a color space is provided. A spectral color value in the ICS is accessed, and the spectral color value is transformed into a calorimetric color value in the color space. The calorimetric color value is mapped into mapped calorimetric color value in a first subspace of the ICS. Mapping the colorimetric color value includes gamut-mapping the calorimetric color value using the calorimetric gamut map, followed by identifying the color space with the first subspace. An intersection of a spectral gamut in the ICS and an affine subspace characterized by the mapped colorimetric color value is determined, and the spectral color value is projected onto the intersection. The first subspace is an orthogonal complement of a null space of a transformation from the ICS to the color space.

Claims20

Dependent claims

A method for mapping spectral colors in an Interim Connection Space of a full spectral space based on a colorimetric gamut map in a color space, the method comprising:

accessing a spectral color value in the Interim Connection Space;
transforming the spectral color value into a colorimetric color value in the color space;
mapping, by using a processor, the colorimetric color value into mapped colorimetric color value in a first subspace of the Interim Connection Space, wherein mapping the colorimetric color value comprises gamut-mapping the colorimetric color value using the colorimetric gamut map, followed by identifying the color space with the first subspace;
determining an intersection of a spectral gamut in the Interim Connection Space and an affine subspace characterized by the mapped colorimetric color value;
and
projecting the spectral color value onto the intersection,
wherein the first subspace is an orthogonal complement of a null space of a transformation from the Interim Connection Space to the color space.

4 more elements

An apparatus for mapping spectral colors in an Interim Connection Space of a full spectral space based on a colorimetric gamut map in a color space, the apparatus comprising:

an accessing unit constructed to access a spectral color value in the Interim Connection Space;
a transformation unit constructed to transform the spectral color value into a colorimetric color value in the color space;
a mapping unit constructed to map the colorimetric color value into mapped colorimetric color value in a first subspace of the Interim Connection Space, wherein mapping the colorimetric color value comprises gamut-mapping the colorimetric color value using the colorimetric gamut map, followed by identifying the color space with the first subspace;
a first determination unit constructed to determine an intersection of a spectral gamut in the Interim Connection Space and an affine subspace characterized by the mapped colorimetric color value;
and
a projection unit constructed to project the spectral color value onto the intersection,
wherein the first subspace is an orthogonal complement of a null space of a transformation from the Interim Connection Space to the color space wherein the forgoing units are implemented by a processor.

4 more elements

Dependencies are inferred from the claim text.

Spectral gamut mapping based on a colorimetric gamut mapping

Life of this patent

Spectral gamut mapping based on a colorimetric gamut mapping

Life of this patent

Abstract

Claims20