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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正距円筒図法、ステレオスコピック法
360度映像のフォーマット
8-3
2種類の映像フォーマット
360 度映像は、全方位の映像を記録し、ユーザーに臨場感のある体験を
提供するために使用されます。スマートフォンでXRアプリケーションを
開発する際にも、360 度映像の取り扱いは重要な要素となります。
ここでは、代表的な360 度映像のフォーマットである
正距円筒図法とス
テレオスコピック法
について解説します。
360度映像を平面上に展開する手法
正距円筒図法は、360度の球面映像を円筒状に投影し、その円筒面を展
開して平面化することで、1 枚の画像として表現する手法です（図 8-5）。
この手法では、上下180 度の視野角が垂直方向に、左右360 度の視野角が
水平方向に並びます。
正距円筒図法のメリットは、直線がそのまま直線として投影されるた
め、画像のひずみが少なく、開発が比較的容易なことです。また、1 枚の
画像として表現されるため、処理能力に制限のあるスマートフォンでも扱
いやすいです。一方、球面から平面への投影の際に解像度が低下するとい
うデメリットがあり、高解像度の 360 度映像を扱う場合は注意が必要です。
360度映像に立体視を実現する手法
ステレオスコピック法は、左右の視点から別々に撮影した2 つの360 度
映像を使用し、ユーザーの左右の眼に個別に映し出すことで、奥行き感の
ある立体的な360 度映像を実現する手法です（図 8-6）。ステレオスコピ
ック法の最大のメリットは、リアルな立体感を実現できる点です。 ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.