Roberto Pockaj

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In this paper we propose a method for implementing a high-level interface for the synthesis and animation of animated virtual faces that is in full compliance with MPEG-4 specifications. This method allows us to implement the Simple Facial Object profile and part of the Calibration Facial Object Profile. In fact, starting from a facial wire-frame and from a(More)
—In this paper, we propose a method for implementing a high-level interface for the synthesis and animation of animated virtual faces that is in full compliance with MPEG-4 specifications. This method allows us to implement the simple facial object profile and part of the calibration facial object profile. In fact, starting from a facial wireframe and from(More)
—An efficient algorithm is proposed to exploit the facial animation parameter (FAP) interpolation modality specified by the MPEG-4 standard in order to allow very low bit-rate transmission of the animation parameters. The proposed algorithm is based on a comprehensive analysis of the cross-correlation properties that characterize FAPs, which is here(More)
The technique proposed in this paper provides operative indications for implementing 3D head models compliant to the facial parameters recently standardized in MPEG-4, capable of being animated for reproducing the behavior of true human faces. The major contribution of this paper consists of an algorithmic proposal for MPEG-4 compliant model animation,(More)
In this paper the complete framework of a software package for real-time animation of 3D facial models according to the MPEG-4 specifications is described. The focus is mainly on the algorithmic solution that has been adopted for scaling the polygon mesh to a level of complexity suited to the specific hw/sw profile of the platform that hosts the decoder.(More)
Video transmission over PSTN links (Public Switched Telephone Networks) suuers from strong bandwidth constraints limiting both the image size and the frame rate, even when eecient coding is adopted. Furthermore there is a lack of audio-video synchronization due to the non-constant frame rate. To overcome these limitations, a method has been devised that(More)
In this paper we propose an efficient algorithm for exploiting the Facial Animation Parameter interpolation modality specified by the MPEG-4 standard in order to allow very low bitrate trasmission of the animation parameters. The proposed algorithm is based on a comprehensive analysis of the cross-correlation properties that characterize FAPs, which is here(More)
The number of web-based applications exploiting three-dimensional, animated virtual characters has significantlyincreasedintherecentpast.However,the HTTP/TCP protocols used for animation delivery in the majority of existing systems fail to guarantee fast interactionoverawiderangeofnetworkconditions.In the case of natural audio and video, unreliable,(More)