Abstract: Provided is a technology of embedding watermark data into an arbitrarily-shaped region by applying a wavelet transform. Prepared are: image data into which the watermark data is to be embedded; a shape map that defines the arbitrarily-shaped region into which the watermark data is to be embedded within the image data; and the watermark data. An SA-DWT processing unit uses the shape map to recognize a given region included in the arbitrarily-shaped region within the image data, and subjects image data in the given region to the wavelet transform. The wavelet transform causes the image data in the arbitrarily-shaped region to be divided into frequency bands, and a watermark data embedding unit embeds the watermark data into a frequency space of the image data generated by the dividing. An SA-IDWT processing unit subjects the resultant to an inverse wavelet transform, and watermark-embedded image data is generated.

Abstract: A structured polygonal mesh data forming method approximates a 3D surface shape with a polygonal mesh constituted by a plurality of polygons and forms 2D structured data applicable of efficient compression/decompression from predetermined information concerning the polygonal. Polygon vertices as the vertices of the polygonal mesh are assigned to nodes as lattice points (triangular lattice including extension nodes) on a 2D coordinate system. 2D structured data is formed by geometric data consisting of the position coordinate data of the respective assigned polygon vertices, texture data including color information, and a connectivity map as information about connection between the respective polygons. When a polygon vertex is assigned to a plurality of nodes, and connected nodes are to be formed on the 2D coordinate system, one representative node is selected from the nodes. Nodes other than the representative node are represented by positions relative to the representative node.

Abstract: In a three-dimensional exploring method for finding location of a buried object by transmitting a wave signal (4) by means of e.g.

Abstract: In a structured polygonal mesh data forming method of approximating a 3D surface shape with a polygonal mesh constituted by a plurality of polygons and forming 2D structured data applicable of efficient compression/decompression from predetermined information concerning the polygonal mesh, polygon vertices as the vertices of the polygonal mesh are assigned to nodes as lattice points (triangular lattice including extension nodes) on a 2D coordinate system, and 2D structured data is formed by geometric data consisting of the position coordinate data of the respective assigned polygon vertices, texture data including color information, and a connectivity map as information about connection between the respective polygons.