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: when an initial reference picture list of a current picture is configured, receiving flag information indicating whether reference picture set information of a reference layer to which the current picture refers is used; generating the initial reference picture list on the basis of the flag information; 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 with a decoding apparatus, comprising:
generating, with the decoding apparatus, an initial reference picture list relating to a current picture; and
performing, with the decoding apparatus, prediction of the current picture based on the initial reference picture list,
wherein the initial reference picture list includes a reference picture list 0 and a reference picture list 1 ,
wherein each of the reference picture list 0 and the reference picture list 1 includes a short-term reference picture set, a long-term reference picture set, and an inter-layer reference picture set,
wherein the inter-layer reference picture set includes a first sub-reference layer picture set and a second sub-reference layer picture set,
wherein the reference picture list 0 is constructed by arranging the first sub-reference layer picture set between a first short-term reference picture set having POCs less than POCs of the current picture and a second short-term reference picture set having POCs greater than POCs of the current picture and arranging the second sub-reference layer picture set at the end of the long-term reference picture set,
wherein the long-term reference picture set, the first short-term reference picture set and the second reference picture set belong to a current layer including the current picture, and
wherein the first and the second sub-reference layer picture sets belong to a different layer from the current layer.
2. The method of claim 1 , further comprising generating, with the decoding apparatus, a final reference picture list by modifying the initial reference picture list.
3. The method of claim 1 , wherein performing prediction of the current picture is configured to use a reference picture, included in an inter-layer reference picture set, as a reference picture of the current picture.
4. The method of claim 1 , wherein the reference picture list 1 is constructed different from the reference picture list 0 in terms of each position of the first and second sub-reference layer picture sets.
5. The method of claim 1 , wherein the reference picture list 1 is constructed by arranging the second sub-reference layer picture set between the second short-term reference picture set and the first short-term reference picture set, and arranging the first sub-reference layer picture set at the end of the long-term reference picture set.