Video signal processing method and device for signaling prediction mode
A video signal processing method comprises: obtaining, from a bitstream, a skip parameter (cu_skip_flag) indicating whether a skip mode is applied to a current block; when the skip parameter indicates that a mode is not the skip mode, obtaining, from the bitstream, a merge parameter (merge_flag) indicating whether the current block is coded with a merge mode; and determining whether a coded block flag (CBF) parameter (cu_cbf), which indicates whether a syntax element related to transform is obtained from the bitstream, is obtained, according to a value of the merge parameter, wherein, when the value of the merge parameter indicates the merge mode, the CBF parameter is not obtained from the bitstream and is determined to be a preconfigured value.
1. A video signal decoding apparatus, comprising a processor,
wherein the processor is configured to:
parse a first parameter, wherein the first parameter indicates whether a skip mode is applied to a current block;
parse a second parameter, when the first parameter indicates the skip mode is not applied to the current block, wherein the second parameter indicates whether a merge mode is applied to the current block, wherein when the first parameter indicates that the skip mode is applied to the current block, the second parameter is not parsed, and a value of the second parameter is inferred as a value indicating that the merge mode is applied to the current block; and
parse a third parameter, when the second parameter indicates that the merge mode is not applied to the current block,
wherein the third parameter indicates whether a syntax structure regarding transformation is present for a coding unit related to the current block,
wherein when the second parameter indicates that the merge mode is applied to the current block, the third parameter is not parsed, and a value of the third parameter is inferred based on the first parameter,
wherein when the first parameter indicates that the skip mode is applied to the current block, the value of the third parameter is inferred as a value indicating that the syntax structure regarding transformation is not present for the coding unit related to the current block,
wherein when the first parameter indicates that the skip mode is not applied to the current block, the value of the third parameter is inferred as a value indicating that the syntax structure regarding transformation is present for the coding unit related to the current block,
wherein, the first parameter is parsed based on a type of slice including the current block.
2. A video signal encoding apparatus, comprising a processor,
wherein the processor is configured to:
encode a first parameter, wherein the first parameter indicates whether a skip mode is applied to a current block;
encode a second parameter, when the first parameter indicates that the skip mode is not applied to the current block, wherein the second parameter indicates whether a merge mode is applied to the current block, wherein when the first parameter indicates the skip mode is applied to the current block, the second parameter is not encoded, and a value of the second parameter is inferred as a value indicating that the merge mode is applied to the current block; and
encode a third parameter, when the second parameter indicates that the merge mode is not applied to the current block,
wherein the third parameter indicates whether a syntax structure regarding transformation is present for a coding unit related to the current block,
wherein when the second parameter indicates that the merge mode is applied to the current block, the third parameter is not encoded, and a value of the third parameter is inferred based on the first parameter,
wherein when the first parameter indicates that the skip mode is applied to the current block, the value of the third parameter is inferred as a value indicating that the syntax structure regarding transformation is not present for the coding unit related to the current block,
wherein when the first parameter indicates that the skip mode is not applied to the current block, the value of the third parameter is inferred as a value indicating that the syntax structure regarding transformation is present for the coding unit related to the current block,
wherein, the first parameter is encoded based on a type of slice including the current block.
3. A method for transmitting a bitstream generated by encoding a video signal, the method comprising:
encoding a first parameter, wherein the first parameter indicates whether a skip mode is applied to a current block;
encoding a second parameter, when the first parameter indicates that the skip mode is not applied to the current block, wherein the second parameter indicates whether a merge mode is applied to the current block, wherein when the first parameter indicates the skip mode is applied to the current block, the second parameter is not encoded, and a value of the second parameter is inferred as a value indicating that the merge mode is applied to the current block;
encoding a third parameter, when the second parameter indicates that the merge mode is not applied to the current block, wherein the third parameter indicates whether a syntax structure regarding transformation is present for a coding unit related to the current block; and
outputting the bitstream including at least one of the first parameter, the second parameter and the third parameter,
wherein when the second parameter indicates that the merge mode is applied to the current block, the third parameter is not encoded, and a value of the third parameter is inferred based on the first parameter,
wherein when the first parameter indicates that the skip mode is applied to the current block, the value of the third parameter is inferred as a value indicating that the syntax structure regarding transformation is not present for the coding unit related to the current block,
wherein when the first parameter indicates that the skip mode is not applied to the current block, the value of the third parameter is inferred as a value indicating that the syntax structure regarding transformation is present for the coding unit related to the current block,
wherein, the first parameter is encoded based on a type of slice including the current block.