Method and apparatus for embedding a watermark into a digital im

Details Method and apparatus for embedding a watermark into a digital im Method and apparatus for embedding a watermark into a digital im

1997-12-24

2000-03-14

Harvey, David E.

Television

Bandwidth reduction system

Data rate reduction

348473, 380 10, 380 49, H04N 708

Patent

active

060379847

ABSTRACT:
A method and apparatus for watermarking an image or sequence of images without limiting the watermark signal. The watermarking apparatus includes a conventional DCT unit and quantizer for generating an array of quantized DCT coefficients. The array is watermarked by masking the array to select certain ones of the DCT coefficients that are then replaced by zero values to form a masked array. The masked array is further processed by a watermark inserter that replaces the zero valued coefficients with predefined watermark coefficients to form a watermarked array of DCT coefficients, e.g., a watermarked image. A decoder for decoding the bitstream thusly generated and for removing the embedded watermark is also taught.

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F. Hartung, B. Girod, "Watermarking of MPEG-2 encoded video without decoding and re-encoding", Proceedings SPIE 3020: Multimedia Computing and Networking 97(MMCN 97) Feb. 1997.
F. Hartung, B. Girod, "Digital Watermarking of Raw and Compressed Video", Systems for Video Communication, pp. 205-213, Oct. 1996.
I. Cox, J. Kilian, T. Leighton, T. Shamoon, "Secure Spread Spectrum Watermarking for Multimedia", NEC Research Institute, Technical Report 95-10.

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