Transmission device, transmitting method, reception device, and receiving method

1. A transmission device, comprising:

circuitry configured to

perform bit depth reduction processing on high bit depth image data to generate reduced bit depth image data, the high bit depth image data having a higher bit depth than the reduced bit depth image data;

transmit a container including a video stream, the video stream including the reduced bit depth image data; and

insert information related to banding suppression processing for the reduced bit depth image data into the video stream, the information including first information indicating whether the banding suppression processing is to be applied to the reduced bit depth image data included in the video stream, wherein

the band suppression processing is applied to the reduced bit depth image data included in the video stream, when the reduced bit depth image data is decoded, based on the information related to banding suppression processing inserted into the video stream.

2. A reception device, comprising:

circuitry configured to

receive a container including a video stream, the video stream including reduced bit depth image data and information related to banding suppression processing for the reduced bit depth image data, the information including first information indicating whether the banding suppression processing is to be applied to the reduced bit depth image data included in the video stream, and the reduced bit depth image data being generated from high bit depth image data having a higher bit depth than the reduced bit depth image data;

decode the reduced bit depth image data in the video stream to obtain decoded image data; and

apply the banding suppression processing to the decoded image data based on the information related to banding suppression processing included in the video stream.

3. The reception device according to claim 2 , wherein the information related to banding suppression processing includes second information indicating whether the banding suppression processing has been applied to the reduced bit depth image data.

4. The reception device according to claim 3 , wherein the information related to banding suppression processing includes third information indicating a type of the banding suppression processing applied to the reduced bit depth image data.

5. The reception device according to claim 2 , wherein the information related to banding suppression processing includes fourth information indicating whether gradation number reducing processing has been applied to the reduced bit depth image data.

6. The reception device according to claim 5 , wherein the information related to banding suppression processing includes fifth information indicating a gradation number before the gradation number reducing processing.

7. The reception device according to claim 2 , wherein the information related to banding suppression processing is inserted into the video stream per a picture or per a scene.

8. The reception device according to claim 2 , wherein identifying information indicating whether the information related to banding suppression processing is inserted into the video stream.

9. The reception device according to claim 8 , wherein the container is a transport stream, and the identifying information is inserted under a video elementary loop of a program map table included in the transport stream.

10. The reception device according to claim 2 , wherein the circuitry is configured to receive the container in response to a request sent by the circuitry.

11. The reception device according to claim 2 , wherein and

the circuitry is configured to control the banding suppression processing to be applied to the decoded image data when the information related to banding suppression processing indicates the banding suppression processing is to be applied to the decoded image data and the banding suppression processing has not been applied to the reduced bit depth image data.

12. The reception device according to claim 2 , wherein the information related to banding suppression processing indicates one of a random dither method, a systematic dither method, or an error diffusion method.

13. The reception device according to claim 2 , further comprising:

a display.

14. The reception device according to claim 2 , wherein the circuitry is configured to determine whether to apply the banding suppression processing based on the information related to banding suppression processing inserted in the video stream.

15. A transmitting method, comprising:

perform bit depth reduction processing on high bit depth image data to generate reduced bit depth image data, the high bit depth image data having a higher bit depth than the reduced bit depth image data;

transmitting, by a transmitter of a transmission device, a container including a video stream, the video stream including the reduced bit depth image data; and

inserting, by circuitry of the transmission device, information related to banding suppression processing for the reduced bit depth image data into the video stream, the information including first information indicating whether the banding suppression processing is to be applied to the reduced bit depth image data included in the video stream, wherein

the band suppression processing is applied to the reduced bit depth image data included in the video stream, when the reduced bit depth image data is decoded, based on the information related to banding suppression processing inserted into the video stream.

16. A receiving method, comprising:

receiving, by a receiver of a reception device, a container including a video stream, the video stream including reduced bit depth image data and information related to banding suppression processing for the reduced bit depth image data, the information including first information indicating whether the banding suppression processing is to be applied to the reduced bit depth image data included in the video stream, and the reduced bit depth image data being generated from high bit depth image data having a higher bit depth than the reduced bit depth image data;

decoding, by circuitry of the reception device, the reduced bit depth image data in the video stream to obtain decoded image data; and

applying, by the circuitry, the banding suppression processing to the decoded image data based on the information related to banding suppression processing included in the video stream.

17. A reception device, comprising:

circuitry configured to

receive a container including a video stream including encoded image data and information related to banding suppression processing for the encoded image data;

decode the video stream to obtain decoded image data;

apply the banding suppression processing to the decoded image data such that the banding suppression processing is applied to the decoded image data when a gradation number that is supported by a display that is configured to display an image based on the decoded image data differs from a bit number of the image data in the video stream.

18. The reception device according to claim 17 , wherein

the encoded image data included in the video stream is reduced bit depth image data, and

the information indicates whether the banding suppression processing is to be applied to the encoded image data included in the video stream.