Stream transmission method for three-dimension model facing mobile terminal

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 present invention involves the field of compression and data exchange in 3D models, especially a streaming method for mobile terminal three -dimensional models. Background technique [0002] With the needs of better user experience and stronger interaction ability, more and more people use three -dimensional models in various applications.At the same time, the popularity of mobile Internet allows people to obtain information or exchange data through mobile terminal devices. [0003] At present, there are still many problems to be solved at domestic and foreign three -dimensional model streaming methods for mobile terminals: there are still many problems to be solved: [0004] 1) Three -dimensional models often have huge data volume, and some even reach a billion -level number. At present, most of the three -dimensional Internet application platform model coding uses multiple details of the LOD (Level of Details) technology.The model pre -forms multiple ...

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 of the research only divides the 3D model into geometric information and topological information, and it is difficult to simultaneously improve the topological compression rate and geometric compression rate of 3D model streaming , most studies choose one of

[0006]3) At present, it is difficult for most of the researches to realize the real-time generation of LOD models, and it is necessary to solve complex linear equations in the process of mesh simplification; and most of the researches are moving In order to complete the lossless reconstruction of the terminal, it 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, without considering the storage capacity of mobile terminals and Network bandwidth instability and thus no further compression of offsets and base meshes

[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 processing capability of the terminal is limited, and there are few studies on the transmission of 3D models for mobile terminals. The direct application of the 3D model transmission method of PC and wired network to mobile terminals and mobile networks is not ideal.

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