Alibaba Group Holding Limited
RECONSTRUCTING TRANSFORMED DOMAIN INFORMATION IN ENCODED VIDEO STREAMS

Abstract:

Discrete cosine transformation (DCT) information can be estimated from adjacent blocks of the same frame. DCT information can be estimated from different frames. Motion vectors can be used to track the position of objects in some frames of the video. For example, a stream of encoded frames is received; the encoded frames are entropy decoded and dequantized to produce DCT information for blocks of the frames; and DCT information for a block in a frame is determined using the DCT information produced from the entropy decoding and dequantizing for a different block.