Patent ID: 7729424

Claim:
A lost block characteristic determining apparatus in a video processing system, the apparatus comprising: a lost block detection unit for determining whether a lost block exists among transmitted video blocks; a pixel difference calculation unit for calculating a temporal difference cost 1 between neighborhood pixels of the lost block in a present frame and neighborhood pixels at same positions in a previous frame; a distribution value calculation unit for calculating a motion vector distribution value cost 2 of peripheral blocks of the lost block in the present frame; and a block characteristic determination unit for receiving the calculated temporal difference cost 1 from the pixel difference calculation unit, for receiving the calculated motion vector distribution value cost 2 from the distribution value calculation unit and for determining a characteristic of the lost block by comparing the received temporal difference cost 1 with a first preset threshold value and by comparing the received motion vector distribution value cost 2 with a second preset threshold value, wherein the distribution value calculation unit calculates a motion vector distribution value cost 2 of peripheral blocks of the lost block using the following formula: 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 denote a horizontal ingredient and a vertical ingredient of MV i , respectively.