A Fast Algorithm for Reconstructing Motion Compensated Blocks in Compressed Domain

Many advanced video applications require processing compressed video signals. For compression systems using the Discrete Cosine Transform (DCT) with motion compensation, we propose an algorithm with Adaptive Low-Pass Filtering (ALPF) to reconstruct blocks with motion vectors in the compensated domain. Compared with the previous work, this algorithm is faster and reduces blocky artifacts caused by quantization. Keywords -- Discrete Cosine Transform, Motion Compensation, Compressed Domain, Low-Pass Filtering 1 INTRODUCTION There are two fundamental ways to process compressed video. One way is by decompressing video frames to gather the information in the pixel domain. The other way involves exploiting the encoded information contained in the compressed representation. Processing video directly in the compressed domain has advantages: smaller data volume and less expensive computation. The DCT is the key compression technique used in the current image and video compression standards. Sin..