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    • 7. 发明申请
    • METHOD AND APPARATUS FOR ENCODING OR DECODING A BITSTREAM
    • 用于编码或解码比特流的方法和设备
    • WO2005052935A3
    • 2005-08-11
    • PCT/IB2004052510
    • 2004-11-23
    • KONINKL PHILIPS ELECTRONICS NVVAN LEEST ADRIAAN JVAN DER VEEN MINNEBRUEKERS ALPHONS A M L
    • VAN LEEST ADRIAAN JVAN DER VEEN MINNEBRUEKERS ALPHONS A M L
    • G06T1/00H04N7/26H04N7/30
    • H04N19/59H04N19/13H04N19/132H04N19/14H04N19/176H04N19/18H04N19/40H04N19/467H04N19/48H04N19/93
    • The invention relates to a system for re-encoding bitstreams for content signals. A re-encoder (101) receives a bitstream comprising e.g. an MPEG-2 encoded signal. The receiver (109) feeds the bitstream to an extraction processor (111) which extracts non-essential information from the bitstream thereby generating a reduced bitstream which is still MPEG-2 compliant. The non-essential information, which specifically may be higher frequency transform coefficients, is re-encoded in a re-encode processor (113) using a non-MPEG-2 encoding principle. The encoding may be optimised for the characteristics of the non-essential information resulting in a more efficient encoding. The re-encoded data is inserted in user data section of the reduced bit stream by a combine processor (115). Thus, an effective reduction in the size of the bitstream may be achieved. A decoder (107) may extract the re-encoded data from the user data section, regenerate the original non-essential information and insert this in the reduced bitstream. Specifically, the original bitstream may be regenerated. The approach may specifically be used for reversible bitstream watermarking that which does not increase the size of the bitstream.
    • 本发明涉及一种用于对内容信号的比特流进行重新编码的系统。 重新编码器(101)接收包括例如比特流的比特流。 一个MPEG-2编码信号。 接收器(109)将比特流馈送到提取处理器(111),提取处理器(111)从比特流中提取非必要信息,从而生成仍然符合MPEG-2的缩减比特流。 使用非MPEG-2编码原理,在重编码处理器(113)中重新编码具体可以是较高频率变换系数的非重要信息。 编码可针对非必要信息的特性进行优化,从而导致更有效的编码。 通过组合处理器(115)将重新编码的数据插入到缩小比特流的用户数据部分中。 因此,可以实现比特流尺寸的有效减小。 解码器(107)可以从用户数据部分提取重新编码的数据,重新生成原始非必要信息并将其插入到缩小比特流中。 具体来说,可以重新生成原始比特流。 该方法可以专门用于不增加比特流大小的可逆比特流水印。