Information processing apparatus, information recording medium, image processing method, and program for converting a color space of an image

1. An information processing apparatus comprising:

circuitry configured to:

receive a first image, a second image and first color space information indicating a first color space of the first image;

convert a second color space of the second image to a converted color space same as the first color space, when the second color space is different from the first color space;

generate a display image including the first image and the second image having the converted color space;

generate a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the first color space of the first image has a first color area and the second color space of the second image has a second color area different from the first color area, and in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers; and

convert a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.

2. The information processing apparatus according to claim 1 ,

wherein the display image is generated by superposing the second image on the first image.

3. The information processing apparatus according to claim 1 ,

wherein the circuitry is configured to:

receive second color space information indicating the second color space of the second image, and

convert the second color space of the second image based on the first color space information and the second color space information.

4. The information processing apparatus according to claim 1 ,

wherein the circuitry is configured to determine color area of a color space of the second image based on a format of the second image.

5. The information processing apparatus according to claim 1 ,

wherein the circuitry is configured to:

control superposing the second image having a palette entry identifier of a given palette corresponding to a predetermined color space having a predetermined color area as color information on the first image,

convert the palette entry identifier of the second image to an image signal corresponding to a same color space having a same color area as the given palette, and

convert the image signal to another image signal for superposition having the same color area as the first color space of the first image.

6. The information processing apparatus according to claim 1 ,

wherein the circuitry is configured to:

control superposing the second image having an RGB signal corresponding to the second color space as color information on the first image.

7. The information processing apparatus according to claim 1 ,

wherein the circuitry is configured to:

control superposing the image signal for superposition on the first image.

8. The information processing apparatus according to claim 1 ,

wherein the first color space of the first image is BT. 2020 or BT. 709, and

the circuitry executes color space conversion processing to cause the second color space of the second image to coincide with the first color space of the first image.

9. The information processing apparatus according to claim 1 ,

wherein the circuitry acquires the first color space information of the first image and second color space information of the second image from attribute information corresponding respectively to the first and second images.

10. The information processing apparatus according to claim 1 ,

wherein the first image and the second image are image data recorded on an information recording medium, and

the circuitry acquires the first color space information of the first image and second color space information of the second image from an attribute information recording file recorded on the information recording medium.

11. The information processing apparatus according to claim 10 ,

wherein the first image and the second image are stored in a clip AV stream file or clip AV stream files, and

the circuitry acquires the first color space information of the first image and second color space information of the second image from a clip information file or clip information files recorded on an information recording medium.

12. The information processing apparatus according to claim 1 ,

wherein at least one image of the first image or the second image is data which is input from external to the information processing device via a communication unit, and

wherein the circuitry acquires color space information of the at least one image from attribute information which is input from external to the information processing device.

13. A non-transitory recording medium configured to store a program executable by a computer and first image data of a first image, first color space information indicating a first color space of the first image, and second image data of a second image; and

wherein the program comprises:

causing a reproduction device configured to generate a display image including the first image and the second image having a converted color space, to convert a second color space of the second image to the converted color space same as the first color space, when the second color space has a second color area different from a first color area of the first color space,

in which the second color space of the second image is converted to the converted color space same as the first color space by

generating a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers, and

converting a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.

14. The non-transitory recording medium according to claim 13 ,

wherein the display image is generated by superposing the second image on the first image.

15. The non-transitory recording medium according to claim 13 ,

wherein the reproduction device is configured to:

receive second color space information indicating the second color space of the second image, and

convert the second color space of the second image based on the first color space information and the second color space information.

16. The non-transitory recording medium according to claim 13 ,

wherein the second color space of the second image is based on a format of the second image.

17. An image processing method comprising:

receiving a first image, a second image and first color space information indicating a first color space of the first image;

converting a second color space of the second image to a converted color space same as the first color space, when the second color space is different from the first color space;

generating a display image including the first image and the second image having the converted color space;

generating a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the first color space of the first image has a first color area and the second color space of the second image has a second color area different from the first color area, and in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers; and

converting a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.

18. The image processing method according to claim 17 ,

wherein the generating of the display image is by superposing the second image on the first image.

19. The image processing method according to claim 17 further comprising:

receiving second color space information indicating the second color space of the second image, and

converting the second color space of the second image based on the first color space information and the second color space information.

20. The image processing method according to claim 17 further comprising:

determining color space of the second image based on a format of the second image.

21. A non-transitory recording medium on which is recorded a program having instructions that, when executed by circuitry, configure the circuitry to:

receive a first image, a second image and first color space information indicating a first color space of the first image;

convert a second color space of the second image to a converted color space same as the first color space, when the second color space is different from the first color space;

generate a display image including the first image and the second image having the converted color space;

generate a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the first color space of the first image has a first color area and the second color space of the second image has a second color area different from the first color area, and in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers; and

convert a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.

22. The non-transitory recording medium according to claim 21 ,

wherein the display image is generated by superposing the second image on the first image.

23. The non-transitory recording medium according to claim 21 , wherein, when the instructions are executed by the circuitry, the circuitry is configured to:

receive second color space information indicating the second color space of the second image, and

convert the second color space of the second image based on the first color space information and the second color space information.

24. The non-transitory recording medium according to claim 21 , wherein, when the instructions are executed by the circuitry, the circuitry is configured to:

determine color area of a color space of the second image based on a format of the second image.