| 摘要 |
According to one embodiment, a watermark detection device includes: a decoding unit comprising a plurality of decoders that respectively decode a plurality of data streams, at least one of which a watermark is superimposed on; a mixer that mixes the decoded data streams; a controller that specifies one of the decoded data streams; and a detection unit that detects the watermark from the specified one of the decoded data streams.
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