Method and apparatus for adaptive encoding and decoding based on image quality
Disclosed herein are a method and apparatus that adaptively perform encoding and decoding based on image quality. An encoding apparatus may determine optimal Frames Per Second (FPS) for a video and may encode the video based on the determined FPS. Further, the encoding apparatus may provide improved temporal scalability. A decoding apparatus may select a frame to be displayed from among frames of a video depending on a required minimum satisfied user ratio. Through the selection of the frame, the decoding apparatus may provide improved temporal scalability.
1. A video decoding method, comprising:
determining whether to decode at least one frame based on selection information for the frame; and
decoding the frame if it is determined to decode the frame based on a temporal identifier of the frame.
2. The video decoding method of claim 1 , wherein:
the determination is performed on each of multiple frames, and
the multiple frames are frames in a Group Of Pictures (GOP).
3. The video decoding method of claim 1 , wherein the selection information is related to a proportion of persons who are unable to perceive degradation of video quality even if display of a video including the frame is set such that the frame is excluded from decoding.
4. The video decoding method of claim 1 , wherein the selection information is related to a proportion of persons who are unable to perceive degradation of video quality even if frames per second (FPS) for display of a video including the frame is determined such that the frame is excluded from decoding.
5. The video decoding method of claim 1 , wherein:
determining whether to decode the at least one frame is performed based on a comparison between a value of the selection information and a value of display information, and
the display information is related to display of a video including the frame.
6. The video decoding method of claim 5 , wherein the display information is related to FPS for display of the video including the frame.
7. The video decoding method of claim 1 , wherein:
if a value of the selection information is greater than a value of display information, it is determined not to decode the frame, and
the display information is related to display of a video including the frame.
8. The video decoding method of claim 1 , wherein the selection information is included in Supplemental Enhancement Information (SEI) for the frame.
9. The video decoding method of claim 1 , wherein determining whether to decode the at least one frame is applied in common to additional frames having a temporal identifier identical to a temporal identifier of the frame, among multiple frames including the frame.
10. A video decoding apparatus, comprising:
a control unit for determining whether to decode at least one frame based on selection information for the frame; and
a decoding unit for decoding the frame if it is determined to decode the frame based on a temporal identifier of the frame.
11. A video encoding method, comprising:
generating selection information for at least one frame of a video; and
encoding the video based on the selection information based on a temporal identifier of the frame.
12. The video encoding method of claim 11 , wherein encoding the video comprises:
determining whether to encode the frame based on the selection information for the frame; and
encoding the frame if it is determined to encode the frame.
13. The video encoding method of claim 12 , wherein determining whether to encode the frame is applied in common to additional frames having a temporal identifier identical to the temporal identifier of the frame, among multiple frames including the frame.
14. The video encoding method of claim 11 , wherein the selection information is related to a proportion of persons who are unable to perceive degradation of video quality even if the frame is excluded from encoding of the video.
15. The video encoding method of claim 14 , wherein the proportion is calculated via machine learning.
16. The video encoding method of claim 14 , wherein the proportion is determined based on a feature vector of the frame.
17. The video encoding method of claim 11 , wherein the selection information includes multiple pieces of selection information, which are calculated for respective Frames Per Second (FPS) for display of the video.
18. The video encoding method of claim 11 , wherein a bitstream generated by encoding the video includes the selection information.
19. The video encoding method of claim 11 , wherein the selection information is applied in common to additional frames having a temporal identifier identical to the temporal identifier of the frame, among multiple frames including the frame.
20. The video encoding method of claim 11 , wherein the selection information is related to a proportion of persons who are unable to perceive degradation of quality of a displayed video even if display of the video is set such that the frame is excluded from decoding.