Hiroaki Date

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Recently, much interest is being taken in methods to protect the copyright of digital data and preventing illegal duplication of it. However, in the area of CAD/CAM and CG, there are no effective ways to protect the copyright of 3D geometric models. As a first step to solve this problem, a new digital watermarking method for 3D polygonal models is(More)
− The Mobile Laser Scanning (MLS) system can acquire point clouds of urban environments including roads, buildings, trees, lamp posts etc. and enables effective mapping of them. With the spread of the MLS system, the demands for the management of roads and facilities using MLS point clouds have increased. Especially, pole-like objects (PLOs) such as lamp(More)
Recently, much interest is being taken in a method to protect the copyright of digital data and prevent illegal duplication of it. However, in the area of CAD/CAM and CG, there are no effective ways to protect the copyright of the 3D geometric models. As a first step to solve this problem, a new digital watermarking method for 3D polygonal models is(More)
In a 3D free-form CAM system, a series of intermediate shape models for machining are required as the references of NC programming. The safety and efficiency of the machining greatly depend on the geometric relation between these intermediate shape models. However current CAM systems lack the function of automatic generation of the appropriate series of(More)