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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.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.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.
170
スティッチング、トーンマッピング
現実世界をデジタル化する技術
7-6
360度撮影で現実世界を記録
360 度映像は、周囲の全方位を1 枚の画像や1 本の動画で表現できるた
め、視野や視点に制限されない体験を提供できます。VR や ARなどの没入
感の高い技術と相性がよく、VRヘッドセットやパノラマビューアを通し
て見ることで、現実にいるかのような感覚を体験することができます。
360度撮影を支える技術
360 度撮影では、複数のカメラで撮影した映像や画像を1 枚の円形に合
成する
スティッチングと、明るさの違いを調整するトーンマッピングが重
要な技術となっています。
スティッチングには、映像の動きを解析して合成するオプティカルフロ
ーと、カメラの位置から計算して合成するジオメトリベースの2 つの手法
があります。オプティカルフローは自動補正できる半面、合成の失敗で継
ぎ目が目立つ欠点があります。一方、ジオメトリベースは継ぎ目が滑らか
ですが、カメラのズレで映像がひずむという欠点があります（図7-11）。
トーンマッピングは、明暗の違いを調整する技術です。全体に同じ調整
をする場合は計算が速く瞬時に反映されますが、細かな表現が難しくなり
ます。部分ごとに調整する場合は細かな表現ができるものの、計算に時間
がかかってしまいます（図7-12）。
このように、360度撮影は映像のつなぎ合わせと明暗の調整が重要な技
術となります。それぞれに長所短所のあるさまざまな手法を使い分けなが
ら、現実世界を忠実に記録できるように成り立っているのです。 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.