Method and apparatus for encoding and decoding video signal using adaptive sampling

#The present invention relates to a method and apparatus for encoding and decoding a video signal using adaptive sampling and, more particularly, to an adaptive sampling method in interpolation filtering process.

#Compression coding means a series of signal processing technologies for sending digitalized information through a communication line or storing digitalized information in a form suitable for a storage medium. Media, such as video, an image, and voice, may be the subject of compression coding. In particular, a technology for performing compression coding on video is called video compression.

#The next-generation video content expects to feature high spatial resolution, a high frame rate, and high dimensionality of a video scene representation. The processing of such content would require a significant increase in memory storage, a memory access rate, and processing power.

#FIG. 1 illustrates a schematic block diagram of an encoder configured to encode a video signal in an embodiment to which the present invention is applied;

#FIG. 2 illustrates a schematic block diagram of a decoder configured to decode a video signal in an embodiment to which the present invention is applied;

#FIG. 3 schematically illustrates the relationship between the positions of samples within a block which is used to perform interpolation filtering in an embodiment to which the present invention is applied;

#In accordance with an aspect of the present invention, there is provided a method of performing interpolation filtering on a video signal, including determining an adaptive sampling rate based on information about the properties of a decoded picture and performing first interpolation filtering using samples to which the adaptive sampling rate has been applied, wherein the adaptive sampling rate corresponds to one of a uniform sampling rate, a reduced sampling rate, and a variable sampling rate.

#If the adaptive sampling rate corresponds to the reduced sampling rate, the first interpolation filtering may be performed based on a uniformly reduced tap length over a filter support area.

#If the adaptive sampling rate corresponds to the variable sampling rate, the interpolation filtering may be performed using different sampling rates within a filter support area.