Patent ID: 8139265

Claim:
A color space conversion apparatus to perform gamut mapping between a first color space and a second color space, the color space conversion apparatus comprising: a first color space conversion unit to convert the first color space into a first Lab color space; a second color space conversion unit to convert the second color space into a second Lab color space; a spherical color space conversion unit to expand the converted first Lab color space and the converted second Lab color space to a same spherical surface so as to convert the first Lab color space and the second Lab color space into a spherical color space; and a spherical gamut mapping unit to map a color gamut of the first Lab color space and a color gamut of the second Lab color space, expanded to the same spherical surface, in the converted spherical color space, wherein the spherical color space conversion unit generates a first coordinate system including three-dimensional points that are obtained by expanding the first Lab color space to the spherical surface having a designated radius, and a second coordinate system including three-dimensional points that are obtained by expanding the second Lab color space to the same spherical surface, and wherein the spherical gamut mapping unit determines a first point of the first coordinate system in the converted spherical color space that has a minimal distance difference with a respective point of the second coordinate system, and maps the first point to the respective point of the second coordinate system one-to-one so as to perform the gamut mapping between the Lab color space of the first coordinate system and the Lab color space of the second coordinate system.