Abstract: A display apparatus (100) includes a shelf tag attachment member (102) being fixed to a front end surface of a product shelf S, and a shelf tag (101) having a display surface (103). The shelf tag (101) is attached to the shelf tag attachment member (102) via a rotation axis A, and is rotatable in a predetermined direction in which the display surface (103) is turned upward. A lower end of the shelf tag (101) is located below a lower surface LS of the product shelf S and a lower end of the shelf tag attachment member (102) in a vertical direction.

Abstract: An information hiding system that hides information-data in the printing-data according to steganography using an embedding means, and produces printed matter by printing out the printing-data on printable media. A scanner is used to read the data, such as image or pattern data, from the printed matter in order to restore the printing-data. The hidden information-data is then extracted from the restored printing-data using an information-data extracting means. Finally, the information-data is outputted in such a form as an image, musical or voice sound, and/or character letters according to the outputting means.

Abstract: An information card and card system that eliminates forgery and illegal use of a card. The information card includes a memory that stores information data, which includes one of image data and acoustic data and contains inherent data that is embedded in the information data according to steganographic information hiding. The inherent data is data that authenticates a legitimacy of a card owner of the information card. The information card system include the information card and a data processing terminal for authenticating the owner of the card and/or the authenticity of the card itself.

Abstract: An information hiding system that hides information-data in the printing-data according to steganography using an embedding means, and produces printed matter by printing out the printing-data on printable media. A scanner is used to read the data, such as image or pattern data, from the printed matter in order to restore the printing-data. The hidden information-data is then extracted from the restored printing-data using an information-data extracting means. Finally, the information-data is outputted in such a form as an image, musical or voice sound, and/or character letters according to the outputting means.

Abstract: Media data such as still image data is subjected to a wavelet transform, and then the wavelet coefficients are quantized. Bit-planes are prepared for the quantized wavelet coefficients. Confidential information is embedded into the bit-planes by using bit-plane decomposition steganography. The modified quantized wavelet coefficients are prepared based on the bit-planes into which the confidential information is embedded. Entropy encoding is performed on the modified quantized wavelet coefficients. As a result, the information is hidden in the media data subjected to progressive compression. On the other hand, entropy decoding is performed on the compressed data, into which the confidential information is embedded, to obtain quantized wavelet coefficients. A bit-plane structure is obtained from the quantized wavelet coefficients, and the hidden information is extracted from the bit-plane structure.