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The famous ones include AutoCAD, 3ds Max, Maya, Art of Illusion, ngPlant, Multigen, SketchUp, and so on. The most common ones are AutoCAD, 3DSMAX and MAYA, which will be introduced in detail below. 3D data can be stored in various formats, including 3DS, OBJ, ASE, MD2, MD3, MS3D, WRL, MDL, BSP, GEO, DXF, DWG, STL, NFF, RAW, POV, TTF, COB, VRML, OFF, and so on. Currently, the most common ones are 3DS, OBJ and DXF, and OFF and OBJ are the two most common formats used in academic research, which will be introduced in detail below.

To make it unencrypted). 3D model information hiding refers to the process of invisibly embedding the copyright information, the authentication information or other secret information into 3D models to fulfill the purpose of copyright protection, content authentication or covert communication. People usually embed information in 3D models with digital watermarking techniques, which will be discussed in Chapters 5 and 6 of this book. 3 Processing Techniques for 3D Model Management and Retrieval In 3D model management and retrieval systems, it often involves 3D model pose normalization, content-based 3D model retrieval (which can fall into one direction in 3D model analysis techniques), volume visualization, and so on.

4 Overview of Multimedia Compression Techniques 39 The theoretical background of compression is provided by information theory and rate-distortion theory. These fields of study were essentially created by Claude Shannon, who published fundamental papers on this topic in the late 1940s and early 1950s. Cryptography and coding theories are also closely related. The idea of data compression is deeply connected with statistical inference. Many lossless data compression systems can be viewed in terms of a four-stage model.

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