Method and apparatus for performing residual prediction of image block when encoding/decoding video signal

A method for encoding an input video signal, comprising:

• encoding the video signal according to a first scheme and outputting a bitstream of a first layer, and encoding the video signal according to a second scheme and outputting a bitstream of a second layer,
• wherein encoding the video signal according to the first scheme includes a process for performing a prediction operation on an image block included in an arbitrary frame of the video signal to produce residual data of the image block, and selectively coding the residual data of the image block into difference data from residual data of a block, spatially corresponding to the image block, in a frame temporally coincident with the arbitrary frame and included in the bitstream of the second layer, based on a difference between coding information of the image block and coding information of the corresponding block.

A method for receiving and decoding a bitstream of a first layer into a video signal, the method comprising:

• reconstructing and outputting video frames having original images by decoding the bitstream of the first layer according to a first scheme using encoding information extracted and provided from a received bitstream of a second layer,
• wherein reconstructing and outputting the video frames includes a process for selectively adding data of a block, which spatially corresponds to a target block in an arbitrary frame in the bitstream of the first layer and which is included in a frame in the bitstream of the second layer temporally coincident with the arbitrary frame, to data of the target block based on a difference between coding information of the target block and coding information of the corresponding block, before reconstructing original pixel data of the target block based on data of a reference block of the target block.