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US 11,706,429 B2Granted
Method and device for encoding and decoding image involving gradual refresh technique
AssigneesHyundai Motor Company, Kia Motors Corporation, Kwangwoon University Industry-Academic Collaboration Foundation
InventorsDong Gyu Sim, Han Sol Choi, Jong Seok Lee, Sea Nae Park, Seung Wook Park, Wha Pyeong Lim
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Abstract
A method is provided for decoding a sequence of pictures using a gradual refresh technique. In particular, all areas in one picture are gradually encoded or decoded over a plurality of pictures associated with the picture.
Claims10
A video decoding method for decoding a sequence of pictures using gradual refresh, comprising:
- decoding, from a header of the sequence in a bitstream, a flag indicating whether the gradual refresh is allowed;
- decoding identification information for identifying a first picture to which the gradual refresh has been applied in the sequence, and determining a picture order count (POC) value of the first picture;
- decoding group size information for identifying a group of pictures associated with the first picture to which the gradual refresh has been applied;
- determining a POC value of a second picture corresponding to a last picture belonging to the group based on the group size information;
- and
- determining the group of pictures associated with the first picture using the POC value of the first picture and the POC value of the second picture,
- wherein, whether to display decoded pictures is determined based on POC values of the decoded pictures such that pictures having a POC value greater than or equal to the POC value of the first picture and less than the POC value of the second picture are not allowed to be displayed after being decoded,
- wherein, the identification information indicates that the gradual refresh is not applied to the first picture in the sequence based on the flag indicating that the gradual refresh is not allowed,
- wherein, the identification information is decoded from a header of the first picture,
- wherein, when the identification information indicates that the first picture is to be subjected to the gradual refresh, the group size information is decoded from the header of the first picture,
- wherein, when a block in a picture belonging to the group is inter-predicted, prediction using a reference block padded with a predefined value is allowed for the block,
- wherein, the predefined value is derived from a bit depth of pixel values, and
- wherein, the predefined value is equal to ½ of a maximum value expressed by the bit depth of the pixel values.
10 more elements
A video encoding method for encoding a sequence of pictures using gradual refresh, comprising:
- encoding, into a header of the sequence in a bitstream, a flag indicating that the gradual refresh is allowed;
- encoding identification information for identifying a first picture to which the gradual refresh is applied in the sequence, and a picture order count (POC) value of the first picture;
- determining a group of pictures associated with the first picture to which the gradual refresh is applied, and encoding group size information for identifying the group of pictures, wherein the group size information is used as information for deriving a POC value of a second picture corresponding to a last picture belonging to the group;
- wherein, pictures having a POC value greater than or equal to the POC value of the first picture and less than the POC value of the second picture are not allowed to be displayed after being decoded,
- wherein, the identification information indicates that the gradual refresh is not applied to the first picture in the sequence based on the flag indicating that the gradual refresh is not allowed,
- wherein, the identification information is encoded in a header of the first picture,
- wherein, when the identification information indicates that the first picture is to be subjected to the gradual refresh, the group size information is encoded in the header of the first picture,
- wherein, when a block in a picture belonging to the group is inter-predicted, prediction using a reference block padded with a predefined value is allowed for the block,
- wherein, the predefined value is derived from a bit depth of pixel values,
- wherein, the predefined value is equal to ½ of a maximum value expressed by the bit depth of the pixel values.
7 more elements
A non-transitory computer readable medium storing a bitstream containing an encoded video data, the encoded video data being decoded from the bitstream by processes of:
- decoding, from a header of the sequence in a bitstream, a flag indicating whether the gradual refresh is allowed;
- decoding identification information for identifying a first picture to which the gradual refresh has been applied in the sequence, and determining a picture order count (POC) value of the first picture;
- decoding group size information for identifying a group of pictures associated with the first picture to which the gradual refresh has been applied;
- determining a POC value of a second picture corresponding to a last picture belonging to the group based on the group size information;
- and
- determining the group of pictures associated with the first picture using the POC value of the first picture and the POC value of the second picture,
- wherein, whether to display decoded pictures is determined based on POC values of the decoded pictures such that pictures having a POC value greater than or equal to the POC value of the first picture and less than the POC value of the second picture are not allowed to be displayed after being decoded,
- wherein, the identification information indicates that the gradual refresh is not applied to the first picture in the sequence based on the flag indicating that the gradual refresh is not allowed
- wherein, the identification information is decoded from a header of the first picture,
- wherein, when the identification information indicates that the first picture is to be subjected to the gradual refresh, the group size information is decoded from the header of the first picture,
- wherein, when a block in a picture belonging to the group is inter-predicted, prediction using a reference block padded with a predefined value is allowed for the block,
- wherein, the predefined value is derived from a bit depth of pixel values, and
- wherein, the predefined value is equal to ½ of a maximum value expressed by the bit depth of the pixel values.
10 more elements
Dependencies are inferred from the claim text.