October 2024
Intermediate
240 pages
6h 57m
Japanese
Content preview from 図解まるわかり VR・AR・MRのしくみ
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86
現実映像から位置を
特定する技術
VPS
5-1
XRにおける描画能力とは？
XRにおける描画能力とは、VRやARなどの仮想環境でコンピュータが
リアルタイムで3Dの画像を生成して表示する能力のことです。簡単にい
うと、XRデバイスの描画能力が高ければ、より複雑で繊細な仮想空間を
スムーズにかつ高解像度で体験できます。
逆に、描画能力が低いと、画像が粗くなったり、動きがカクカクしたり
して没入感が損なわれます。したがって、デバイスの描画能力はXR体験
の質を決定する非常に重要な要素の一つなのです。
描画能力を向上させるためには位置特定技術が不可欠
また、描画能力が高いと、よりリアルで鮮明な画像が得られますが、そ
れだけで十分とはいえません。ユーザーが物理的に動くたびにその位置を
正確に特定し、そのデータにもとづいて仮想環境やオブジェクトを正確な
位置にリアルタイムで描画する技術も必要です（図 5-1）。この正確な位
置特定ができないと、例えばユーザーが頭を動かしたときに仮想空間がず
れて見えることがあり、没入感を大きく損ねてしまうのです。
VPSにみる位置特定技術
VPS（VisualPositioningSystem）は、特に AR の分野で利用される位置
特定技術の一つです。VPSを利用すると、スマートフォンやARデバイス
が周囲の環境をカメラで撮影し、その画像をもとに向きや方角などの位置
情報を正確に把握することができます。
例えば、GoogleMapsなどにもVPSが利用されています。位置情報とい
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.