Apparatus and method for recovering spatial motion vector

An apparatus for recovering a motion vector to perform error concealment on received video stream, the apparatus comprising:

• a first selecting unit configured to select a first valid motion vector that is spatially closest to a lost motion vector within a same frame and from a first slice that is above a lost slice, and select a second valid motion vector that is spatially closest to the lost motion vector within the same frame and from a second slice that is below the lost slice;
• a second selecting unit configured to determine at least one first neighboring valid motion vector within the same frame that is a nearest valid motion vector adjacent to the first valid motion vector, and determine at least one second neighboring valid motion vector within the same frame that is a nearest valid motion vector adjacent to the second motion vector;
• and
• a recovering unit configured to generate a recovered motion vector of the lost motion vector, comprised in the lost slice, using a weighted average of valid motion vectors including at least the first valid motion vector, the second valid motion vector, the first neighboring valid motion vector, and the second neighboring valid motion vector,
• wherein a weight of each of the valid motion vectors is inversely proportional to a spatial distance within the same frame between each of the valid motion vectors and the lost motion vector,
• wherein the valid motion vectors are properly decoded motion vectors within the same frame that do not include any intra-coded motion vectors and are not based on error concealment information of other lost motion vectors, and
• wherein at least one of the first or second valid motion vectors is located between the lost motion vector and at least one of the first or second neighboring valid motion vectors within the same frame.