Method and apparatus for color space conversion using per-color selection of look-up table density
View Patent ↗A method of performing color space conversion includes maintaining a data structure that has a plurality of dimensions and that contains a plurality of locations storing information in each of the dimensions. Each of the dimensions corresponds to a different one of a plurality of input color signal components. The number of locations which the data structure contains in a first one of the dimensions is different from the number of locations which the data structure contains in a second one of the dimensions. The method further includes inputting first data defined according to a first color space, and generating second data defined according to a second color space, by applying information contained in the data structure to the first data.
1. A method operating within one or more microprocessors of performing color space conversion, the method comprising:
maintaining a data structure that has a plurality of dimensions and that contains a plurality of locations storing information in each of the dimensions, each of the dimensions corresponding to a different one of a plurality of input color signal components, wherein the number of locations which the data structure contains in a first one of the dimensions is different from the number of locations which the data structure contains in a second one of the dimensions; and
inputting first data defined according to a first color space;
generating second data defined according to a second color space, by applying information contained in the data structure to the first data.
2. A method as recited in claim 1 , wherein the data structure comprises a plurality of multi-dimensional look-up tables (LUTs), each corresponding to a different output color component.
3. A method as recited in claim 2 , wherein each of the multi-dimensional LUTs includes a plurality of locations, each location containing an output color signal value for a particular combination of the plurality of input color signal components.
4. A method as recited in claim 3 , wherein the plurality of multi-dimensional LUTs comprises three multi-dimensional look-up tables (LUTs), each corresponding to a different output color signal component, each of the multi-dimensional LUTs having a separate dimension for each of the plurality of input color signal components.
5. A method as recited in claim 4 , wherein each of said multi-dimensional LUTs is a three-dimensional LUT.
6. An apparatus comprising:
an input device to receive first data defined according to a first color space;
a memory having stored therein a data structure that has a plurality of dimensions and that contains a plurality of locations storing information in each of the dimensions, each of the dimensions corresponding to a different one of a plurality of input color signal components, wherein the number of locations which the data structure contains in a first one of the dimensions is different from the number of locations which the data structure contains in a second one of the dimensions; and
a processor to generate second data defined according to a second color space, by applying information contained in the data structure to the first data.
7. An apparatus as recited in claim 6 , wherein the apparatus is a digital camera.
8. An apparatus as recited in claim 6 , wherein the data structure comprises a plurality of multi-dimensional look-up tables (LUTs), each corresponding to a different output color component.
9. An apparatus as recited in claim 8 , wherein each of the multi-dimensional LUTs includes a plurality of locations, each location containing an output color signal value for a particular combination of the plurality of input color signal components.
10. An apparatus as recited in claim 9 , wherein the plurality of multi-dimensional LUTs comprises three multi-dimensional look-up tables (LUTs), each corresponding to a different output color signal component, each of the multi-dimensional LUTs having a separate dimension for each of the plurality of input color signal components.
11. An apparatus as recited in claim 9 , wherein each of said multi-dimensional LUTs is a three-dimensional LUT.
12. A digital camera comprising:
a set of optics;
an image sensor coupled to the optics;
an analog-to-digital converter to generate first data defined according to a first color space based on output of the image sensor;
a memory having stored therein a data structure that has a plurality of dimensions and that contains a plurality of locations storing information in each of the dimensions, each of the dimensions corresponding to a different one of a plurality of input color signal components, wherein the number of locations which the data structure contains in a first one of the dimensions is different from the number of locations which the data structure contains in a second one of the dimensions; and
a processor to generate second data defined according to a second color space, by applying information contained in the data structure to the first data.
13. A digital camera as recited in claim 12 , wherein the data structure comprises a plurality of multi-dimensional look-up tables (LUTs), each corresponding to a different output color component.
14. A digital camera as recited in claim 13 , wherein each of the multi-dimensional LUTs includes a plurality of locations, each location containing an output color signal value for a particular combination of the plurality of input color signal components.
15. A digital camera as recited in claim 14 , wherein the plurality of multi-dimensional LUTs comprises three multi-dimensional look-up tables (LUTs), each corresponding to a different output color signal component, each of the multi-dimensional LUTs having a separate dimension for each of the plurality of input color signal components.
16. A digital camera as recited in claim 15 , wherein each of said multi-dimensional LUTs is a three-dimensional LUT.
17. An apparatus comprising:
logic to maintain in a memory a data structure that has a plurality of dimensions and that contains a plurality of locations storing information in each of the dimensions, each of the dimensions corresponding to a different one of a plurality of input color signal components, wherein the number of locations which the data structure contains in a first one of the dimensions is different from the number of locations which the data structure contains in a second one of the dimensions; and
an input to receive first data defined according to a first color space;
logic to generate second data defined according to a second color space, by applying information contained in the data structure to the first data.
18. An apparatus as recited in claim 17 , wherein the data structure comprises a plurality of multi-dimensional look-up tables (LUTs), each corresponding to a different output color component.
19. An apparatus as recited in claim 18 , wherein each of the multi-dimensional LUTs includes a plurality of locations, each location containing an output color signal value for a particular combination of the plurality of input color signal components.
20. An apparatus as recited in claim 19 , wherein the plurality of multi-dimensional LUTs comprises three multi-dimensional look-up tables (LUTs), each corresponding to a different output color signal component, each of the multi-dimensional LUTs having a separate dimension for each of the plurality of input color signal components.
21. An apparatus as recited in claim 20 , wherein each of said multi-dimensional LUTs is a three-dimensional LUT.