Title :
Bit allocation for joint source and channel coding of progressively compressed 3-D models
Author :
Al-Regib, Ghassan ; Altunbasak, Yucel ; Mersereau, Russell M.
Author_Institution :
Center for Signal & Image Process., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This work presents a joint source and channel coding method for transmission of progressively compressed three-dimensional (3-D) models where the bit budget is allocated optimally. The proposed system uses the Compressed Progressive Mesh (CPM) algorithm to produce a hierarchical bitstream representing different levels of detail (LODs). In addition to optimizing the transmitted bitstream with respect to the channel characteristics, we also choose the optimum combination of quantization and tessellation to maximize the expected decoded model quality. That is, given a 3-D mesh, a total bit budget (B) and a channel packet-loss rate (PLR), we determine the optimum combination of: 1) the geometry coordinates quantizer step size (l-bit); 2) the number of transmitted batches (L); 3) the total number of channel coding bits (C); and 4) the distribution of these channel coding bits among the transmitted levels (CL). Experimental results show that, with our unequal error protection approach that uses the proposed bit-allocation algorithm, the decoded model quality degrades more gracefully (compared to either no error protection or equal error protection methods) as the packet-loss rate increases.
Keywords :
combined source-channel coding; computer graphics; forward error correction; mesh generation; optimisation; quantisation (signal); virtual reality; 3D graphic; 3D mesh compression; IP network; bit allocation; channel packet-loss rate; compressed progressive mesh; graphic streaming; hierarchical bitstream; joint source channel coding; level of detail; optimization; packet-loss resilient transmission; progressively compressed 3D model; quantization; unequal error protection approach; virtual reality; Application software; Bandwidth; Bit rate; Channel coding; Compression algorithms; Computer graphics; Decoding; Delay; Error correction codes; Virtual reality;
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
DOI :
10.1109/TCSVT.2004.841638