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In future videocommunication services, the user's communication device, such as PC, laptop, PDA or mobile phone is equipped with new interaction modalities. These can be cameras and microphones on the capturing side and speech synthesis and video/3D graphics on the rendering side. Haptic and tactile interfaces become also available. These modalities help the user to interact more intuitive with complex devices and tools and provide new services. Hence, a key challenge of new modalities isdoi:10.1109/icme.2006.262552 dblp:conf/icmcs/SchreerEKTE06 fatcat:vl6zqgk4dre5tiwhvjeasqvetq