Patent ID: 7684492

Claim:
An apparatus for recovering a lost block of an image comprising: a lost block detector configured to determine whether there is a lost block in a received image block; a pixel difference calculator configured to calculate a temporal difference value (cost 1 ) between adjacent pixels of a current frame with the lost block and a previous frame; a variance value calculator configured to calculate a motion vector variance value (cost 2 ) of adjacent blocks to the lost block; a block characteristic determining unit configured to determine characteristics of the lost block by comparing the temporal difference value (cost 1 ) and the motion vector variance value (cost 2 ) with a pre-set threshold value; and a lost block recovering unit configured to recover the lost block by applying an error concealment method based on the determined characteristics of the lost block, wherein the variance value calculator calculates the motion vector variance value (cost 2 ) using the following equations: cos ⁢ ⁢ t 2 = ∑ i = 1 7 ⁢ MV i 2 - [ ∑ i = 1 7 ⁢ MV i ] 2 MV i = MV ix 2 + MV iy 2 wherein MV ix and MV iy are horizontal and vertical components of MV i , respectively.