Re-using motion vetors to encode a combined picture signal

摘要

A video signal processor comprises a first input for receiving a compressed first video signal (A) including transcoding parameters associated with the pictures (I, P, B) of the signal Q, DCT-type, and Motion Vectors. A decoder (D1) decodes the compressed first video signal whilst preserving the parameters in association with the pictures. A second input receives a second video signal (B) to be combined with the said first video signal. A combiner (110) combines the second video signal with the first video signal to produce a combined signal (C). An encoder (E2) re-encodes the combined signal (C). The encoder reuses the said parameters for encoding parts of the combined signal which are derived solely from the first signal to maintain picture quality and provides new motion vectors for other parts of the picture signal.