Method and apparatus for transmitting and receiving broadcast signal so as to adjust colour range of content

1. A method of transmitting a broadcast signal by an apparatus for transmitting a broadcast signal, the method comprising:

encoding video data and signaling information for mapping a position of a color in an original gamut of the video data into a new position in a target gamut different from the original gamut,

wherein the signaling information includes initial mapping type information indicating a mapping method for mapping the position of the color and initial mapping information indicating specific information on the mapping method,

wherein the signaling information includes region number information indicating the number of regions in the target gamut, the target gamut being divided into the regions to apply a different weight function to each region,

wherein the signaling information includes adaptive mapping type information indicating a type of the weight function used in each region and weight function information indicating coefficients defining the weight function, the weight function being used to remap the new position into another new position in the target gamut;

generating a broadcast signal comprising the encoded video data and signaling information; and

transmitting the generated broadcast signal.

2. The method according to claim 1 , wherein the signaling information comprises original gamut information indicating type of the original gamut of the video data and target gamut information indicating type of the target gamut.

3. The method according to claim 1 , wherein the signaling information comprises information indicating a method of distinguishing the regions and detailed information for distinguishing the regions according to the method of distinguishing the regions.

4. The method according to claim 3 , wherein the detailed information for distinguishing the regions comprises information on a start point and end point for calculation of a distance as a reference for distinguishing the regions and coordinate information on one or more color spaces for distinguishing the regions.

5. The method according to claim 1 , wherein the weight function depends on the new position of the color in the target gamut, the new position being calculated by the mapping method based on the initial mapping type information.

6. The method according to claim 1 , wherein:

the broadcast signal comprises ultra high definition (UHD) service information indicating a type of a UHD service comprising the video data; and

the UHD service information comprises information for identifying that the UHD service is a UHD broadcast service comprising the signaling information.

7. A method of receiving a broadcast signal by an apparatus for receiving a broadcast signal, the method comprising:

receiving a broadcast signal comprising video data and signaling information for mapping a position of a color in an original gamut of the video data into a new position in a target gamut different from the original gamut,

wherein the signaling information includes initial mapping type information indicating a mapping method for mapping the position of the color and initial mapping information indicating specific information on the mapping method,

wherein the signaling information includes region number information indicating the number of regions in the target gamut. the target gamut being divided into the regions to apply a different weight function to each region,

wherein the signaling information includes adaptive mapping type information indicating a type of the weight function used in each region and weight function information indicating coefficients defining the weight function, the weight function being used to remap the new position into another new position in the target gamut;

extracting the video data and the signaling information from the received broadcast signal; and

decoding the extracted video data and signaling information.

8. The method according to claim 7 , wherein the signaling information comprises original gamut information indicating a type of the original gamut of the video data and target gamut information indicating type of the target gamut.

9. The method according to claim 7 , wherein the signaling information comprises information indicating a method of distinguishing the regions and detailed information for distinguishing the regions according to the method of distinguishing the regions.

10. The method according to claim 9 , wherein the detailed information for distinguishing the regions comprises information on a start point and end point for calculation of a distance as a reference for distinguishing the regions and coordinate information on one or more color spaces for distinguishing the regions.

11. The method according to claim 7 , wherein the weight function depends on the new position of the color in the target gamut, the new position being calculated by the mapping method based on the initial mapping type information.

12. The method according to claim 7 , wherein:

the broadcast signal comprises ultra high definition (UHD) service information indicating a type of a UHD service comprising the video data; and

the UHD service information comprises information for identifying that the UHD service is a UHD broadcast service comprising the signaling information.

13. An apparatus for transmitting a broadcast signal, the apparatus comprising:

an encoder configured to encode video data and signaling information for mapping a position of a color in an original gamut of the video data into a new position in a target gamut different from the original gamut,

wherein the signaling information includes initial mapping type information indicating a mapping method for mapping the positionof the color and initial mapping information indicating specific information on the mapping method.

wherein the signaling information includes region number information indicating the number of regions in the target gamut. the target gamut being divided into the regions to apply a different weight function to each region,

wherein the signaling information includes adaptive mapping type information indicating a type of the weight function used in each region and weight function information indicating coefficients defining the weight function, the weight function being used to remap the new position into another new position in the target gamut;

a broadcast signal generator configured to generate a broadcast signal comprising the encoded video data and signaling information; and

a transmitter configured to transmit the generated broadcast signal.

14. An apparatus for receiving a broadcast signal, the apparatus comprising:

a receiver configured to receive a broadcast signal comprising video data and signaling information for mapping a position of a color in an original gamut of the video data into a new position in a target gamut different from the original gamut,

wherein the signaling information includes initial mapping type information indicating a mapping method for mapping the position of the color and initial mapping information indicating specific information on the mapping method,

wherein the signaling information includes region number information indicating the number of regions in the target gamut, the target gamut being divided into the regions to apply a different weight function to each region,

wherein the signaling information includes adaptive mapping type information indicating a type of the weight function used in each region and weight function information indicating coefficients defining the weight function, the weight function being used to remap the new position into another new position in the target gamut;

an extractor configured to extract the video data and the signaling information from the received broadcast signal; and

a decoder configured to decode the extracted video data and signaling information.