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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112
アバターフェイスアニメーション
アバターの表情を生成する技術
5-14
表情や感情表現ができるアバター
アバターのモデルを作った最初の段階では表情が1 種類のみのため、感
情を他者にうまく伝えることができません。そこで、フェイスアニメーシ
ョンによって、3Dアバターの表情を変化させてコミュニケーション手段
の幅を広げることができ、高い没入感を実現できます。
AIとCGで生成されるアバター表現
アバターフェイスアニメーションは、AIを使ってアバターの表情や口の
動きをリアルタイムに生成する技術です。この技術の中核となるのが、顔
認識と表情推定です。
アバターの表情アニメーションを生成するには、まず人間の顔と表情を
認識する必要があり、この作業をAI が行います。
カメラで人間の顔を捉えると、AIは顔の特徴的な部分（目、鼻、口な
ど）の位置を特定します。これが顔認識と呼ばれる技術です（図5-27）。
次に、認識した顔の特徴から、喜びや悲しみ、驚きなどの表情を判別し
ます。この表情推定では、AIが人間の表情の変化をリアルタイムで追跡し
ています。表情データが得られると、今度はアバターの3Dモデルにその
表情を反映させていきます。アバターの顔には多数のボーン（骨）が設定
されており、これらを動かすことでさまざまな表情を作り出します。
さらに、あらかじめ作られた基本的な表情モデルを組み合わせる、ブレ
ンドシェイプと呼ばれる手法を使うと、滑らかな表情の移り変わりを実現
できます（図5-28）。
このようにして、人間の表情をリアルタイムでアバターに反映すること ...
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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.