Patent ID: 8837828
Filing Date: 2014-09-16
Classification: G09G,H04N

Abstract:
1. A CIE Lab color space based color conversion method, characterized by comprising: inputting original diagram data based on CIE Lab three-dimensional color space; equally dividing the space in which all the colors corresponding to the original diagram data are located into n two-dimensional color planes of the color space according to lightness so as to form n two-dimensional color planes L determining specific most saturated points An, Bn, Cn, Dn, . . . of the original diagram data on an outer perimeter of the two-dimensional color plane Ln and determining specific most saturated points An′, Bn′, Cn′, Dn′, . . . on an outer perimeter of the target two-dimensional color plane Ln′ that is of the same lightness level as the two-dimensional color plane Ln of the original diagram data, wherein the specific most saturated points An′, Bn′, Cn′, Dn′, . . . on the outer perimeter of the two-dimensional color plane Ln′ and the specific most saturated points An, Bn, Cn, Dn, . . . on the outer perimeter of the two-dimensional color plane Ln form a first one-to-one corresponding relationship; determining a first conversion matrix according to the first one-to-one corresponding relationship between the specific, most-saturated outer perimeter points An′, Bn′, Cn′, Dn′, . . . of the two-dimensional color plane Ln′ and the specific, most-saturated outer perimeter points An, Bn, Cn, Dn, . . . of the two-dimensional color plane Ln and converting the two-dimensional color (a, b) of one of the specific, most-saturated outer perimeter points of the two-dimensional color plane Ln into two-dimensional (a′, b′) of the point of the target two-dimensional color plane Ln′ corresponding to said one specific, most-saturated outer perimeter point according to the first conversion matrix; determining a second one-to-one corresponding relationship between specific most-saturated points An- calculating the two-dimensional color (a, b) of specific, most-saturated outer perimeter points Ax, Bx, Cx, Dx, . . . of a two-dimensional color plane Lx having a lightness level between the two-dimensional color plane Ln and the two-dimensional color plane Ln- determining a third conversion matrix between the two-dimensional color (a*, b*) of the two-dimensional color plane Lx and the target two-dimensional color (a*′, b*′) of the two-dimensional color plane Lx′ according to the specific, most-saturated outer perimeter points Ax′, Bx′, Cx′, Dx′, . . . of the two-dimensional color plane Lx′ and the specific, most-saturated outer perimeter points Ax, Bx, Cx, Dx, . . . of the two-dimensional color plane Lx; applying the third conversion matrix to calculate a color-converted and adjusted target color for the color of one point of the original diagram data on the two-dimensional color plane Lx; and outputting or storing target diagram data corresponding to color-converted and adjusted target color.