초록 ▼

An MPEG2 moving picture and encoding/decoding system to provide digital copy protection of digital moving picture data. The MPEG2 moving picture encoder discrete cosine transforms a video input signal and uses a digital watermark inserter to embed digital watermark information on a frequency domain

An MPEG2 moving picture and encoding/decoding system to provide digital copy protection of digital moving picture data. The MPEG2 moving picture encoder discrete cosine transforms a video input signal and uses a digital watermark inserter to embed digital watermark information on a frequency domain of the discrete cosine transformed video input signal. The MPEG2 moving picture decoder receives the encoded video output signal from the MPEG2 moving picture encoder and removes the embedded visual watermark information to locally decode the encoded video signal.

대표청구항 ▼

[ What is claimed:] [1.]1. An MPEG2 moving picture encoder to encode a video signal with digital watermark information and including a frame memory, a frame/field memory, an activity calculator, a rate controller, a Discrete Cosine Transform (DCT) unit, a quantizer, a dequantizer, an Inverse Discret

[ What is claimed:] [1.]1. An MPEG2 moving picture encoder to encode a video signal with digital watermark information and including a frame memory, a frame/field memory, an activity calculator, a rate controller, a Discrete Cosine Transform (DCT) unit, a quantizer, a dequantizer, an Inverse Discrete Cosine Transform (IDCT) unit, an adaptive estimator, a motion estimator, a variable length coder and multiplexer (VLC & a MUX) and a buffer, the MPEG2 moving picture encoder comprising:a digital watermark inserter installed between said DCT and said VLC & MUX, to generate and discrete-cosine-transform the digital watermark information, and then embed the digital watermark information on a frequency domain of the video signal; anda digital watermark remover, installed between said dequantizer and said IDCT, to remove the digital watermark information on a spatial domain of the video signal, so as to prevent an error during estimating motion on a temporal domain for P and B pictures of the video signal.