Transmission device, transmission method, reception device, and reception method
To preferably transmit normal-frame-rate and high-frame-rate image data. A first ratio mixing processing is performed on two temporally-consecutive pictures in high-frame-rate image data to obtain basic-frame-rate image data, and a second ratio mixing processing is performed on the two temporally-consecutive pictures to obtain high-frame-rate image data of an extended frame. An encoding processing is performed on the reference-frame-rate image data to obtain a basic stream and an encoding processing is performed on the high-frame-rate image data of the extended frame to obtain an extended stream. A container including the basic stream and the extended stream in a predetermined format is transmitted.
1. A transmission device, comprising circuitry configured to:
perform a first mixing process on two temporally-consecutive first pictures in high-frame-rate image data to obtain basic image data, a first mixing ratio of the first mixing process being p to q, p and q being numbers, p being greater than or equal to 0 and smaller than or equal to 1, a sum of p and q being equal to 1, and a second mixing process on two temporally-consecutive second pictures in the high-frame-rate image data to obtain extended image data, a second mixing ratio of the second mixing process being r to s, r and s being numbers, r being greater than or equal to 0 and smaller than or equal to 1, a sum of r and s being equal to 1;
perform an encoding process to encode the basic image data to obtain basic encoded image data, and to encode the extended image data to obtain extended encoded image data; and
transmit the basic encoded image data, the extended encoded image data, and mixing ratio information indicating the first mixing ratio.
2. The transmission device according to claim 1 , wherein the first mixing ratio is different from the second mixing ratio.
3. The transmission device according to claim 1 , wherein the two temporally-consecutive first pictures include at least one of the two temporally-consecutive second pictures.
4. The transmission device according to claim 1 , wherein the two temporally-consecutive first pictures are the same two pictures of the two temporally-consecutive second pictures.
5. The transmission device according to claim 1 , wherein the circuitry is configured to transmit a container including the basic encoded image data, the extended encoded image data, and the mixing ratio information, and the container has a format of MPEG-2 Transport Stream (MPEG-2 TS), MPEG Media Transport (MMT) or ISO Base Media File Format (ISO BMFF).
6. A reception device, comprising:
a receiver configured to:
receive basic encoded image data which is obtained by encoding basic image data, and extended encoded image data which is obtained by encoding extended image data, wherein the basic image data is obtained by performing a first mixing process on two temporally-consecutive first pictures in high-frame-rate image data, a first mixing ratio of the first mixing process being p to q, p and q being numbers, p being greater than or equal to 0 and smaller than or equal to 1, a sum of p and q being equal to 1, and the extended image data is obtained by performing a second mixing process on two temporally-consecutive second pictures in the high-frame-rate image data, a second mixing ratio of the second mixing process being r to s, r and s being numbers, r being greater than or equal to 0 and smaller than or equal to 1, a sum of r and s being equal to 1; and
receive mixing ratio information indicating the first mixing ratio; and
circuitry configured to:
decode the basic encoded image data to obtain decoded basic image data;
decode the extended encoded image data to obtain decoded extended image data; and
perform a reverse mixing process with the decoded basic image data, the decoded extended image data, and the mixing ratio information to obtain the high-frame-rate image data.
7. The reception device according to claim 6 , wherein the reverse mixing process is performed according to:
[
A
B
]
=
[
C
D
]
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1
p
*
s
-
q
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r
[
s
-
r
-
q
p
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,
where A and B represent the image data of the two temporally-consecutive pictures, respectively, C and D represent the decoded basic image data and the decoded extended image data, respectively.
8. The reception device according to claim 6 , wherein the two temporally-consecutive first pictures in the high-frame-rate image data are the same two pictures of the two temporally-consecutive second pictures in the high-frame-rate image data.
9. The reception device according to claim 6 , wherein the circuitry is further configured to perform interpolation processing on the high-frame-rate image data to obtain image data having a higher frame rate than the high-frame-rate image data.
10. The reception device according to claim 6 , wherein the basic encoded image data, the extended encoded image data, and the mixing ratio information are included in a container, and the container has a format of MPEG-2 Transport Stream (MPEG-2 TS), MPEG Media Transport (MMT) or ISO Base Media File Format (ISO BMFF).
11. The reception device according to claim 6 , further comprising:
a display to display the high-frame-rate image data.
12. A reception method, comprising:
receiving, by a receiver of a reception device, basic encoded image data which is obtained by encoding basic image data, and extended encoded image data which is obtained by encoding extended image data, wherein the basic image data is obtained by performing a first mixing process on two temporally-consecutive first pictures in high-frame-rate image data, a first mixing ratio of the first mixing process being p to q, p and q being numbers, p being greater than or equal to 0 and smaller than or equal to 1, a sum of p and q being equal to 1, and the extended image data is obtained by performing a second mixing process on two temporally-consecutive second pictures in the high-frame-rate image data, a second mixing ratio of the second mixing process being r to s, r and s being numbers, r being greater than or equal to 0 and smaller than or equal to 1, a sum of r and s being equal to 1;
receiving, by the receiver of the reception device, mixing ratio information indicating the first mixing ratio;
decoding, by circuitry of the reception device, the basic encoded image data to obtain decoded basic image data;
decoding, by the circuitry of the reception device, the extended encoded image data to obtain decoded extended image data; and
performing, by the circuitry of the reception device, a reverse mixing process with the decoded basic image data, the decoded extended image data, and the mixing ratio information to obtain the high-frame-rate image data.
13. The reception method according to claim 12 , wherein the reverse mixing process is performed according to:
[
A
B
]
=
[
C
D
]
*
1
p
*
s
-
q
*
r
[
s
-
r
-
q
p
]
,
where A and B represent the image data of the two temporally-consecutive pictures, respectively, C and D represent the decoded basic image data and the decoded extended image data, respectively.
14. The reception method according to claim 12 , wherein the two temporally-consecutive first pictures in the high-frame-rate image data are the same two pictures of the two temporally-consecutive second pictures in the high-frame-rate image data.
15. The reception method according to claim 12 , further comprising:
performing, by the circuitry of the reception device, interpolation processing on the high-frame-rate image data to obtain image data having a higher frame rate than the high-frame-rate image data.
16. The reception method according to claim 12 , wherein the basic encoded image data, the extended encoded image data, and the mixing ratio information are included in a container, and the container has a format of MPEG-2 Transport Stream (MPEG-2 TS), MPEG Media Transport (MMT) or ISO Base Media File Format (ISO BMFF).