<technical report>
Stabilization of Frame Rate by Variable Resolution for On-line Free-viewpoint Video

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Abstract 近年, 現実世界の対象を自由な視点から表示する自由視点映像のオンライン生成についての研究が盛んに行われている.既存のシステムの処理は, 視体積交差法を用いた形状復元(ボクセル表現), ボクセル表現から三角バッチ表現への変換, 三角バッチの色付けの大きく3段階に分かれる.ここで, 対象物体の表面積が増加すると三角バッチの数が増加するため, 処理速度が低下してしまう.そこで, 本研究では形状復元の空間...解像度を変化させ三角バッチの数をほぼ一定にすることによりフレームレートを安定化させる手法を提案する.具体的には, 空間解像度を可変にするために, 8分木を利用した視体積交差法によって空間解像度を徐々に上げながら行い, 一定の時間が経過すると処理を打ち切る.このシステムを実装しフレームレートが安定することを確かめた.
Recently, there are a lot of researches on on-line generation of a free-viewpoint video which shows objects in the real world from an arbitray viewpoint. The processing method is divided into three stages, reconstruction of a 3D model by the visual cone intersubsection method, conversion of 3D model representation from a voxel form to a triangular patch form, and coloring triangular patches. Here, if the surface area of objects becomes larger, the frame rare becomes lower since the processing time of the conversion and coloring depends on the number of triangular patches. Then, in this paper we propose a new method to stabilize the frame rate by changing the space resolution of 3D model reconstruction 3D for stabilizing the number of triangular patches. It is realized by raising the space resolution step by step and stopping the process when a time is over by using an octtree-based visual cone intersection method. And, experimental results show that our method makes the frame rate stabler.
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Created Date 2009.04.22
Modified Date 2020.11.02

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