To provide an electronic watermark system and its method, in which the influences on a source image are approximately equivalent to the conventional examples and data of an embedded electronic watermark can be read from image, even after processing has been performed over a range of magnification power wider than the conventional examples.
An electronic watermark embedding system includes an electronic watermark embedding means for embedding electronic watermarks in a source image and a reduced image of the source image in accordance with their image sizes; an image enlarging means for enlarging the reduced image in which the electronic watermark is embedded, to the image size of the source image to produce an enlarged image; and an image composing means for composing the source image, in which the electronic watermark is embedded, and the enlarged image and outputting a result as an electronic watermarked image.
| JPH05120408 | IMAGE FILING SYSTEM |
| JPH04255078 | IMAGE PROCESSOR |
| JP3766140 | IMAGE PROCESSING AND COMPOSING METHOD AND ITS DEVICE |
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama
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