The emerging Video-based dynamic mesh coding standard is designed on the concepts of subdivision surfaces and the lifting scheme applied to a simplified variant of a dynamic mesh. Those processes create displacement d...
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ISBN:
(纸本)9798350391152;9798350391145
The emerging Video-based dynamic mesh coding standard is designed on the concepts of subdivision surfaces and the lifting scheme applied to a simplified variant of a dynamic mesh. Those processes create displacement data, i.e., residual information that is hierarchically predicted through each subdivision iteration, that is then coded using traditional 2D video codecs. The current draft of the standard defines the packing of the displacement data in a video frame in a way that does not support adaptations based on Level-of-Detail (LoD). In this paper, we describe and evaluate an experimental LoD adaptive displacement packing method that could be used to optimize bandwidth consumption or to save computational complexity and battery at the client side. We show that a modified packing of the displacement video data and a LoDadaptive selection of lifting parameters, combined with HEVC motion constrained tile sets provide this functionality with a low impact on compression performance. The LoD adaptive displacement packing method described in this paper has been recently adopted into the V-DMC standard specifications.
The emerging Video-based dynamic mesh coding (V-DMC) standard is designed on the concepts of subdivision surfaces and the lifting scheme. Subdivision surfaces generate different levels-of-detail (LoD) that enable to d...
详细信息
ISBN:
(纸本)9798350391152;9798350391145
The emerging Video-based dynamic mesh coding (V-DMC) standard is designed on the concepts of subdivision surfaces and the lifting scheme. Subdivision surfaces generate different levels-of-detail (LoD) that enable to decode and render a dynamic mesh sequence at different resolutions. The initial specifications of V-DMC only supported the use of the midpoint subdivision method, that is applied to a so-called base mesh, which is a decimated version of the input dynamic mesh sequence frame being processed. Geometry details, capturing the difference between the subdivided mesh and the original mesh are added after the mesh subdivision and are called displacements. While the midpoint subdivision has the benefit of a low complexity, it also generates large displacement data as subdivided vertices lie on the respective planes of the base mesh triangles. In this paper, we present the adaptation of three subdivision methods to V-DMC: Loop, Least Square Subdivision Surfaces (LS3), and Butterfly. We show that combining different subdivision methods at different LoDs results in significant compression performance gains.
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