Method and apparatus for processing video signals
According to the present invention, a method for processing video signals can determine an interview motion vector of a current block using an interview motion vector of a temporal neighboring block in consideration of a global motion vector. The present invention can obtain an accurate interview motion vector according to obtaining the temporal neighboring block of the current block in consideration of a motion change according to output sequence information and accordingly, can increase the accuracy of inter-prediction.
1. A method for processing a video signal by a decoder, the method comprising:
obtaining a global motion vector from the video signal;
obtaining a corresponding block within a temporal neighboring picture corresponding to a current block of a current picture,
wherein a position of the corresponding block is indicated by the obtained global motion vector, and the temporal neighboring picture is positioned at a same view as the current picture and at a different time than the current picture;
obtaining temporal neighboring blocks by using the corresponding block,
wherein the temporal neighboring blocks include a center block including a center pixel of the corresponding block, a lower right block including a lower right side pixel of the corresponding block, and an upper left block including an upper left side pixel of the corresponding block; and
obtaining an inter-view motion vector of the current block from an inter-view motion vector for one of the temporal neighboring blocks,
wherein obtaining the inter-view motion vector of the current block includes:
when the center block is coded using the inter-view motion vector, determining the inter-view motion vector of the center block as the inter-view motion vector of the center block,
when the center block is not coded using the inter-view motion vector and the lower right block is coded using the inter-view motion vector, determining the inter-view motion vector of the lower right block as the inter-view motion vector of the current block, and
when the center block and the lower right block are not coded using the inter-view motion vector and the upper left block is coded using the inter-view motion vector, determining the inter-view motion vector of the upper left block as the inter-view motion vector of the current block.
2. A device for processing a video signal, the device comprising:
an entropy decoder configured to obtain a global motion vector from the video signal; and
an inter predictor configured to obtain a corresponding block within a temporal neighboring picture corresponding to a current block of a current picture, wherein a position of the corresponding block is indicated by the obtained global motion vector, and the temporal neighboring picture is positioned at a same view as the current picture and at a different time than the current picture, to obtain temporal neighboring blocks by using the corresponding block, wherein the temporal neighboring blocks include a center block including a center pixel of the corresponding block, a lower right block including a lower right side pixel of the corresponding block, and an upper left block including an upper left side pixel of the corresponding block, and to obtain an inter-view motion vector of the current block from an inter-view motion vector for one of the temporal neighboring blocks,
wherein obtaining the inter-view motion vector of the current block includes:
when the center block is coded using the inter-view motion vector, determining the inter-view motion vector of the center block as the inter-view motion vector of the center block,
when the center block is not coded using the inter-view motion vector and the lower right block is coded using the inter-view motion vector, determining the inter-view motion vector of the lower right block as the inter-view motion vector of the current block, and
when the center block and the lower right block are not coded using the inter-view motion vector and the upper left block is coded using the inter-view motion vector, determining the inter-view motion vector of the upper left block as the inter-view motion vector of the current block.