Image encoding method using a skip mode, and a device using the method

An image decoding method, comprising:

• extracting encoding information indicating whether residual block information for a target block is present in a bitstream from the bitstream;
• and
• generating a reconstruction block for the target block based on the encoding information, wherein:
• the reconstruction block is generated based on a prediction block for the target block,
• the reconstruction block is generated based on intra prediction which uses an intra prediction direction for the target block in a case that the encoding information indicates that the residual block information is not present,
• the intra prediction direction determines one or more reference pixels used for the intra prediction, and values for the encoding information to indicate whether the residual block information is present are 0 and 1.

An image encoding method, comprising:

• generating encoding information indicating whether residual block information is used in generating a reconstruction block for a target block;
• and
• generating the reconstruction block for the target block, wherein:
• in decoding for the target block, the reconstruction block is generated based on a prediction block for the target block,
• in decoding for the target block, the reconstruction block is generated based on intra prediction using an intra prediction direction for the target block in a case that the encoding information indicates that the residual block information is not used,
• the intra prediction direction determines one or more reference pixels used for the intra prediction, and
• values for the encoding information to indicate whether the residual block information is present are 0 and 1.

An image encoding method, comprising:

• generating encoding information for a target block;
• and
• generating a bitstream comprising the encoding information, wherein:
• the encoding information indicates whether residual block information for generating a reconstruction block for the target block is present in the bitstream,
• in decoding for the target block, the reconstruction block is generated based on a prediction block for the target block,
• in decoding for the target block, the reconstruction block is generated based on intra prediction which uses an intra prediction direction for the target block in a case that the encoding information indicates that the residual block information is not present,
• the intra prediction direction determines one or more reference pixels used for the intra prediction, and
• values for the encoding information to indicate whether the residual block information is present are 0 and 1.

A non-transitory computer-readable recording medium storing a bitstream for decoding an image, the bitstream comprising:

• encoding information indicating whether residual block information for a target block is present in the bitstream, wherein:
• a reconstruction block for the target block is generated based on the encoding information,
• the reconstruction block is generated based on a prediction block for the target block,
• the reconstruction block is generated based on intra prediction which uses an intra prediction direction for the target block in a case that the encoding information indicates that the residual block information is not present,
• the intra prediction direction determines one or more reference pixels used for the intra prediction, and
• values for the encoding information to indicate whether the residual block information is present are 0 and 1.