| 摘要 |
In an image encoding apparatus for receiving and encoding an image signal, the input image signal is encoded in units of blocks in accordance with an encoding parameter via a DCT device, quantizer, and variable-length encoder. The encoded codes are multiplexed together with information indicating the presence/absence of scrambling, authentication data, a quantization parameter used in the quantizer, and a quantization parameter obtained by converting this quantization parameter. A copyrighted image signal is scrambled upon encoding, an image decoding apparatus of an authentic viewer normally plays back, and an image decoding apparatus of an unauthentic viewer plays back an image with which the viewer can recognize its outline.
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