System and method for a multi-primary wide gamut color system
Systems and methods for a multi-primary color system for display. A multi-primary color system increases the number of primary colors available in a color system and color system equipment. Increasing the number of primary colors reduces metameric errors from viewer to viewer. One embodiment of the multi-primary color system includes Red, Green, Blue, Cyan, Yellow, and Magenta primaries. The systems of the present invention maintain compatibility with existing color systems and equipment and provide systems for backwards compatibility with older color systems.
1. A system for displaying a primary color system, comprising:
a set of image data including a set of primary color signals, wherein the set of primary color signals corresponds to a set of values in an International Commission on Illumination (CIE) Yu′v′ color space, wherein the set of values in the CIE Yu′v′ color space includes a luminance (Y) and two colorimetric coordinates (u′,v′);
an image data converter, wherein the image data converter includes a digital interface, and wherein the digital interface is operable to encode and decode the set of values in the CIE Yu′v′ color space; and
at least one non-linear function for processing the set of values in the CIE Yu′v′ color space, wherein the at least one non-linear function is applied to data related to the luminance (Y) and data related to the two colorimetric coordinates (u′,v′), wherein the at least one non-linear function includes a data range reduction function with a value between about 0.25 and about 0.9 and/or an inverse data range reduction function with a value between about 1.1 and about 4;
wherein the encode and the decode includes transportation of processed Yu′v′ data, wherein the processed Yu′v′ data includes a first channel related to the luminance (Y), a second channel related to a first colorimetric coordinate (u′) of the two colorimetric coordinates (u′,v′), and a third channel related to a second colorimetric coordinate (v′) of the two colorimetric coordinates (u′,v′).
2. The system of claim 1 , wherein the image data converter is in network communication with at least one viewing device, wherein the image data converter is operable to convert the set of image data for display on the at least one viewing device, and wherein the at least one viewing device is operable to display the primary color system based on the set of image data.
3. The system of claim 1 , wherein the image data converter is operable to convert the set of primary color signals to the set of values in the CIE Yu′v′ color space and/or the set of values in the CIE Yu′v′ color space to a plurality of color gamuts.
4. The system of claim 1 , wherein the image data converter is operable to fully sample the processed Yu′v′ data on the first channel and subsample the processed Yu′v′ data on the second channel and the third channel.
5. The system of claim 1 , wherein the processed Yu′v′ data on the first channel, the second channel, and the third channel are fully sampled.
6. The system of claim 1 , wherein the encode includes scaling of the two colorimetric coordinates (u′,v′), thereby creating a first scaled colorimetric coordinate and a second scaled colorimetric coordinate.
7. The system of claim 6 , wherein the scaling includes dividing the first colorimetric coordinate (u′) by a first divisor to create the first scaled colorimetric coordinate and dividing the second colorimetric coordinate (v′) by a second divisor to create the second scaled colorimetric coordinate, wherein the first divisor is between about 0.55 and about 0.70, and wherein the second divisor is between about 0.53 and about 0.65.
8. The system of claim 1 , wherein the decode includes rescaling of data related to a first scaled colorimetric coordinate and data related to a second scaled colorimetric coordinate.
9. The system of claim 8 , wherein the rescaling includes multiplying the data related to the first scaled colorimetric coordinate by a first multiplier and multiplying the data related to the second colorimetric coordinate by a second multiplier, wherein the first multiplier is between about 1.42 and about 1.82, and wherein the second multiplier is between about 1.53 and about 1.89.
10. The system of claim 1 , wherein the encode includes converting the set of primary color signals to XYZ data and then converting the XYZ data to create the set of values in the CIE Yu′v′ color space and/or the decode includes converting the processed Yu′v′ data to XYZ data and then converting the XYZ data to a format operable to display on at least one viewing device.
11. The system of claim 1 , wherein the set of image data includes pixel mapping data.
12. The system of claim 1 , wherein the processed Yu′v′ data is transported using a standardized transportation format.
13. The system of claim 12 , wherein the standardized transportation format is operable to transport RGB data or YCbCr data.
14. The system of claim 1 , wherein the image data converter applies one or more of the at least one non-linear function to encode and/or decode the set of values in the CIE Yu′v′ color space.
15. The system of claim 1 , wherein the image data converter includes a look-up table.
16. A system for displaying a primary color system, comprising:
a set of image data including a set of primary color signals, wherein the set of primary color signals corresponds to a set of values in an International Commission on Illumination (CIE) Yu′v′ color space, wherein the set of values in the CIE Yu′v′ color space includes a luminance (Y) and two colorimetric coordinates (u′,v′);
an image data converter, wherein the image data converter includes a digital interface, and wherein the digital interface is operable to encode and decode the set of values in the CIE Yu′v′ color space;
at least one non-linear function for processing the set of values in the CIE Yu′v′ color space, wherein the at least one non-linear function is applied to data related to the luminance (Y) and data related to the two colorimetric coordinates (u′,v′), wherein the at least one non-linear function includes a data rate reduction function with a value between about 0.25 and about 0.9 and/or an inverse data rate reduction function with a value between about 1.1 and about 4; and
a set of Session Description Protocol (SDP) parameters;
wherein the encode and the decode includes transportation of processed Yu′v′ data, wherein the processed Yu′v′ data includes a first channel related to the luminance (Y), a second channel related to a first colorimetric coordinate (u′) of the two colorimetric coordinates (u′,v′), and a third channel related to a second colorimetric coordinate (v′) of the two colorimetric coordinates (u′,v′).
17. The system of claim 16 , wherein the SDP parameters are modifiable.
18. A method for displaying a primary color system, comprising:
providing a set of image data including a set of primary color signals, wherein the set of primary color signals corresponds to a set of values in an International Commission on Illumination (CIE) Yu′v′ color space, wherein the set of values in the CIE Yu′v′ color space includes a luminance (Y) and two colorimetric coordinates (u′,v′);
encoding the set of image data in the CIE Yu′v′ color space using a digital interface of an image data converter;
processing the set of image data in the CIE Yu′v′ color space by scaling the two colorimetric coordinates (u′,v′) and applying at least one non-linear function to the luminance (Y) and the scaled two colorimetric coordinates, wherein the at least one non-linear function includes a data rate reduction function with a value between about 0.25 and about 0.9; and
decoding the set of image data in the CIE Yu′v′ color space using the digital interface of the image data converter;
wherein the encoding and the decoding include transportation of processed Yu′v′ data, wherein the processed Yu′v′ data includes a first channel related to the luminance (Y), a second channel related to a first colorimetric coordinate (u′) of the two colorimetric coordinates (u′,v′), and a third channel related to a second colorimetric coordinate (v′) of the two colorimetric coordinates (u′,v′).
19. The method of claim 18 , wherein the scaling of the two colorimetric coordinates includes dividing the first colorimetric coordinate (u′) by a first divisor to create a first scaled colorimetric coordinate and data related to the second colorimetric coordinate (v′) by a second divisor to create a second scaled colorimetric coordinate, wherein the first divisor is between about 0.55 and about 0.70, and wherein the second divisor is between about 0.53 and about 0.65.
20. The method of claim 18 , wherein the decoding of the set of image data includes rescaling data related to two scaled colorimetric coordinates and applying an inverse of the at least one non-linear function to data related to the luminance (Y) and the data related to the two colorimetric coordinates (u′,v′), wherein the inverse of the at least one non-linear function is an inverse data rate reduction function with a value between about 1.1 and about 4.