Color image display method and apparatus

Claim 2

A color image display method for displaying an image corresponding to an input image signal, comprising the steps of: (a) obtaining color characteristic data of the input image signal before an input color image is displayed; (b) selecting a single color transformation method from a plurality of color transformation methods on the basis of color characteristics of a display device and the input color characteristic data to produce a display of the input color image which accurately displays the colors of the input color image, wherein the plurality of color transformation methods include a three-dimensional LUT transforming method, a simple LUT transforming method, and a mixed matrix color transforming method, said mixed matrix color transforming method including an inverse gamma correction step, a color transformation step, and a gamma correction step; (c) generating a transformation table in accordance with the selected color transformation method; and (d) performing color transformation on the input image signal using the selected color transformation method.

Claim 3

The color image display method as claimed in claim 1, wherein the transformation table generated in accordance with the selected color transformation method is one of a three-dimensional table, a one-dimensional table, and a mixed matrix table which is obtained by mixing an inverse gamma correction table, a color transformation matrix and a gamma correction table.

Claim 4

A color image display method for displaying an image corresponding to an input image signal, comprising the steps of: selecting a single color transformation method from a plurality of color transformation methods on the basis of input color characteristic data and color characteristics of a display device to produce a display of an input color image which optimally displays the colors of the input color image, wherein the plurality of color transformation methods include a three-dimensional LUT transforming method, a simple LUT transforming method and a mixed matrix color transforming method, said mixed matrix color transforming method including an inverse gamma correction step, a color transformation step, and a gamma correction step; and performing color transformation on the input image signal using a transformation table which is generated in accordance with the selected color transformation method so as to optimally display the input color image in accordance with the display device.

Claim 5

A color image display method for displaying an image corresponding to an input image signal, comprising the steps of: selecting a single color transformation method from a plurality of color transformation methods on the basis of input color characteristic data and color characteristics of a display device to produce a display of an input color image which optimally displays the colors of the input color image, wherein the plurality of color transformation methods include a three-dimensional LUT transforming method, a simple LUT transforming method and a mixed matrix color transforming method, said mixed matrix color transforming method including an inverse gamma correction step, a color transformation step, and a gamma correction step; and performing color transformation on the input image signal using a transformation table which is generated in accordance with the selected color transformation method so as to optimally display the input color image in accordance with the display device.

Claim 6

The color image display method as claimed in claim 3, wherein the transformation table generated in accordance with the selected color transformation method is one of a three-dimensional table, a one-dimensional table, and a mixed matrix table which is obtained by mixing an inverse gamma correction table, a color transformation matrix and a gamma correction table.

Claim 7

A color image display apparatus for displaying an image corresponding to an input image signal, comprising: input color characteristic information obtaining means for obtaining input color characteristic data of an input color image signal; an input color data storage element for holding the input color characteristic data obtained by said input color characteristic information obtaining means; a display color characteristic data storage element for storing color characteristic data of a display device; a color transformation table generating element for generating color transformation table data on the basis of the input color characteristic data and the display device color characteristic data; and a color transforming element for correcting the color of the input image data, wherein said color transformation table generating element includes a color transformation system selecting element for selecting a single color transformation system from a plurality of color transformation systems on the basis of the input color characteristic data and the display device color characteristic data to produce a display of an input color image which accurately displays the colors of the input color image, and further includes a plural-tables generating element for generating a plurality of color transformation tables, and wherein the plurality of color transformation systems perform color transformation on the input image signal according to a three-dimensional LUT transforming method, a simple LUT transforming method, and a mixed matrix color transforming method, respectively, said mixed matrix color transforming method including an inverse gamma correction step, a color transformation step, and a gamma correction step.

Claim 8

A color image display apparatus for displaying an image corresponding to an input image signal, comprising: input color characteristic information obtaining means for obtaining input color characteristic data of an input color image signal; an input color data storage element for holding the input color characteristic data obtained by said input color characteristic information obtaining means; a display color characteristic data storage element for storing color characteristic data of a display device; a color transformation table generating element for generating color transformation table data on the basis of the input color characteristic data and the display device color characteristic data; and a color transforming element for correcting the color of the input image data, wherein said color transformation table generating element includes a color transformation system selecting element for selecting a single color transformation system from a plurality of color transformation systems on the basis of the input color characteristic data and the display device color characteristic data to produce a display of an input color image which accurately displays the colors of the input color image, and further includes a plural-tables generating element for generating a plurality of color transformation tables, and wherein the plurality of color transformation systems perform color transformation on the input image signal according to a three-dimensional LUT transforming method, a simple LUT transforming method, and a mixed matrix color transforming method, respectively, said mixed matrix color transforming method including an inverse gamma correction step, a color transformation step, and a gamma correction step.

Claim 9

The color image display apparatus as claimed in claim 5, wherein said color transforming element comprises: a color transforming switch for indicating a color transformation method selected from the three-dimensional LUT transformation, the simple LUT transformation, and the mixed matrix transformation in accordance with a signal output from said color transformation system selecting element; a three-dimensional table storage element for storing a three-dimensional table; a three-dimensional LUT transforming element for performing color transformation using the three-dimensional table; a one-dimensional table storage element for storing a one-dimensional table; a simple LUT transforming element for performing color transformation by using the one-dimensional table; a mixed matrix table storage element for storing a mixed matrix table which is obtained by mixing an inverse gamma correction table, a color transformation matrix and a gamma correction table; and a mixed matrix color transforming element for performing color transformation by using the mixed matrix table, and wherein said plural-tables generating element of said color transformation table generating means comprises: a three-dimensional table generating element for generating the three-dimensional table; a one-dimensional table generating element for generating the one-dimensional table; and a mixed matrix table generating element for generating the mixed matrix table.