3D model streaming method for mobile terminals

Abstract

The invention discloses a stream transmission method for a three-dimension model facing a mobile terminal. The method comprises the steps of conducting global parameterization on the three-dimension model by utilization of the MAPS algorithm, partitioning the three-dimension model into geometrical information, parameter information and connectedness information, and building a self-adaptive approximate semi-canonical model; then conducting inverse improved loop small wave conversion on the semi-canonical model to obtain a base grid and side-play mount, conducting zero-tree coding on the side-play mount to further conduct entropy coding, and based on a mobile terminal platform, compressing the base grid through single resolution based on the edge breaker algorithm; finally decoding through the inverse process simplified by the grid, and drawing an original model. The stream transmission method is moderate in calculated amount and high in decompression speed, is mainly applied to a PC on a mobile network to transmit complex three-dimension model to the mobile terminal, and improves the topology compression ratio and the geometry compression ratio to a certain degree.

Description

technical field [0001] The invention relates to the field of three-dimensional model compression and data exchange, in particular to a mobile terminal-oriented three-dimensional model stream transmission method. Background technique [0002] With the demand for better user experience and stronger interactive capabilities, people are using more and more 3D models in various applications. At the same time, the popularization of mobile Internet makes people obtain information or exchange data more through mobile terminal equipment. [0003] At present, there are still many problems to be solved about the 3D model streaming method for mobile terminals at home and abroad: [0004] 1) 3D models often have a huge amount of data, and some even reach the order of billions. Most of the current 3D Internet application platform model coding adopts the multi-detail hierarchical structure LOD (Level of Details) technology, because LOD technology requires 3D The model pre-generates multi...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are as follows: i) the sender determines the current scene required by the requester, which increases its own load; ii) if the sender does not know the information about the scene already existing locally by the requester, it will often send data repeatedly

[0005] 2) At present, most studies only divide the 3D model into geometric information and topological information. It is difficult to improve the topological compression rate and geometric compression rate of 3D model streaming at the same time. Most studies choose one

[0006] 3) At present, most of the research is not easy to realize the real-time generation of LOD model, and it is necessary to solve complex linear equations in the process of mesh simplification; and most of the research is in order to complete the non-destructive reconstruction on the mobile terminal, which affects the graphics redrawing speed

[0007] 4) Most studies only consider how to generate multi-resolution models from 3D models, and directly transmit base grids and offsets. grid for compression

[0008] 5) At present, most of the 3D model transmission still stays on the PC side. The mobile network has the characteristics of high bit error rate, narrow bandwidth, and large bandwidth jitter. The effect of directly applying the 3D model transmission method of PC and wired network to mobile terminals and mobile networks is not ideal

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