PCクラスタによるドーム投映のための画像変形補正法  [in Japanese] Distorted Image Correction for A PC - Cluster Based Dome Projection System  [in Japanese]

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Abstract

我々はプラネタリウムなどのドーム空間を対象とする,複数台の凡用プロジェクタとPCクラスタからなる新たな投映システムの研究開発を行っている。このシステムではプロジェクタが投殻(あるいはその外部)に設置されているため,ドーム中心からの投映を想定して作成された画像を投映すると、画像の辺縁部にかなりの歪みが生じる。本研究ではこの歪みを補正するために、ドーム空間の構造などをパラメータ化した上で,投映画像と原画像の間座標変換を行う解析式を導出する。またこの解析式に基づき,実際の変形補正をテーブル参照によって行う方式を提案する。この方式の実装と評価結果より、単純な補正処理ではVGA画像のリアルタイム補正が可能であることと,より高い解像度の画像や複雑な補正処理の場合でもオフライン補正については実用的な性能が得られるこが明らかになった。We are now pursuing a research and development project of a new projection system for dome theaters such as planetaria. The system consists of a set of general purpose LCD projection and a PC-cluster. Since aprojector is located on the spherical surface of the dome, its projection image is distorted because the image is assumed to be projected from the center of the dome sphere. In this paper, we show a set of analytical equations with dome structure parameters for the coordinate transformation between projected and original images. Based on the equations, we also show a table look-up algorithm for the distorted image correction methods with various complexity. The implementation and evaluation of the algorithm proved that a simple correction method is applicable to real-time VGA image correction. As for finer images and/or more complicated correction methods, the practicality for off-line correction of the algorithm is also proved.

We are now pursuing a research and development project of a new projection system for dome theaters such as planetaria. The system consists of a set of general purpose LCD pro-jectors and a PC-cluster. Since a projector is located on the spherical surface of the dome, its projection image is distorted because the image is assumed to be projected from the center of the dome sphere. In this paper, we show a set of analytical equations with dome structure parameters for the coordinate transformation between projected and original images. Based on the equations, we also show a table look-up algorithm for the distorted image correction methods with various complexity. The implementation and evaluation of the algorithm proved that a simple correction method is applicable to real-time VGA image correction. As for finer images and/or more complicated correction methods, the practicality for off-line correction of the algorithm is also proved.

Journal

  • IPSJ SIG Notes

    IPSJ SIG Notes 2001(39(2001-ARC-143)), 19-24, 2001-05-11

    Information Processing Society of Japan (IPSJ)

References:  4

Codes

  • NII Article ID (NAID)
    110002774915
  • NII NACSIS-CAT ID (NCID)
    AN10096105
  • Text Lang
    JPN
  • Article Type
    Technical Report
  • ISSN
    09196072
  • NDL Article ID
    5805037
  • NDL Source Classification
    ZM13(科学技術--科学技術一般--データ処理・計算機)
  • NDL Call No.
    Z14-1121
  • Data Source
    CJP  NDL  NII-ELS  IPSJ 
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