Method for decoding image and apparatus using same

A method of decoding video, the method comprising:

• receiving, by a decoding apparatus, a bitstream including inter prediction type information and information on a residual sample, wherein the inter prediction type information indicates whether list0 prediction, list1 prediction or bi-prediction is applied to a current block;
• deriving, by the decoding apparatus, a bin string of the inter prediction type information;
• deriving, by the decoding apparatus, a value of the inter prediction type information based on the bin string;
• determining, by the decoding apparatus, an inter prediction type for the current block based on the value of the inter prediction type information;
• deriving, by the decoding apparatus, a prediction sample of the current block based on the inter prediction type;
• deriving, by the decoding apparatus, the residual sample based on the residual information;
• and
• generating, by the decoding apparatus, a reconstructed sample based on the prediction sample and the residual sample,
• wherein whether the bi-prediction is not available for the current block is determined based on a size of the current block.

A decoding apparatus for decoding video, the apparatus comprising:

• an entropy decoder for receiving a bitstream including inter prediction type information and information on a residual sample, wherein the inter prediction type information indicates whether list0 prediction, list1 prediction or bi-prediction is applied to the current block, for deriving a bin string of the inter prediction type information, and for deriving a value of the inter prediction type information based on the bin string;
• a predictor for determining an inter prediction type for the current block based on the value of the inter prediction type information, and to derive a prediction sample of the current block based on the inter prediction type;
• an inverse transformer for deriving the residual sample, wherein the residual sample is derived based on the residual information;
• and
• an adder configured to generate a reconstructed sample based on the prediction sample and the residual sample,
• wherein whether the bi-prediction is not available for the current block is determined based on a size of the current block.