Image encoding and decoding method supporting plurality of layers and apparatus using same
An image decoding method supporting a plurality of layers according to the present invention may comprise the steps of: generating an inter-layer reference picture set with respect to one or more reference layers to which a current picture can refer; generating an initial reference picture list including the inter-layer reference picture set; and predicting the current picture on the basis of the initial reference picture list. Accordingly, the present invention provides a method for generating a reference picture list including a picture of a layer, which is different from a layer to be currently encoded and decoded, and an apparatus using the same.
1. A method for decoding a video supporting multiple layers, comprising:
generating an inter-layer reference picture set for at least one reference layer capable of being referred to by a current picture;
generating a reference picture list including the inter-layer reference picture set and a temporal reference picture set;
obtaining predicted values of a current block in the current picture by performing prediction of the current block based on the reference picture list and a reference picture index of the current block;
obtaining residual values of the current block; and
generating reconstructed values of the current block by adding the predicted values and the residual values,
wherein the temporal reference picture set comprises a short-term reference picture set and a long-term reference picture set, and
wherein the inter-layer reference picture set comprises a first sub-reference layer picture set and a second sub-reference layer picture set,
wherein the first sub-reference layer picture set is arranged, in the reference picture list, between a first short-term reference picture set including short-term reference pictures having POCs less than POC of the current picture and a second short-term reference picture set including short-term reference pictures having POCs greater than POC of the current picture and
the second sub-reference layer picture set is arranged, in the reference picture list, at the end of a long-term reference picture set including long-term reference pictures,
wherein the temporal reference picture set and the inter-layer reference picture set belong to different layers.
2. The method of claim 1 , wherein generating the inter-layer reference picture set comprises:
generating at least one of a spatial reference layer picture set, a video quality reference layer picture set, a multiview reference layer picture set, or a depth map reference layer picture set that are capable of being referred to by the current picture.
3. The method of claim 1 , wherein at least one reference picture in the inter-layer reference picture set is obtained by up-sampling a picture in the reference layer to correspond to the current picture.
4. The method of claim 1 , wherein at least one reference picture in the inter-layer reference picture set corresponds to a long-term reference picture.