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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180
DiffusionModel
特殊な質感や視覚表現を
実現する生成AI
7-11
圧倒的な表現とリアリティを自動化する生成AI
XRコンテンツにおいて、リアルな質感や視覚表現を緻密に再現する生
成AIの存在は欠かせません。これまで手作業で行っていたこれらの表現
技術ですが、生成AIにより自動化させることで、効率的かつ高クオリテ
ィな3D体験が実現できます。さらに、人間の想像を超えた表現方法が可
能となり、XRコンテンツの可能性を大きく広げることにもつながります
（図7-21）。
ノイズからリアルな画像を生み出すDiusion Model
Diusion Model（拡散モデル）は、画像データの拡散過程を学習し
た画像生成AIモデルです。このモデルでは、画像にランダムなノイズを
加えた後、ノイズを徐々に除去しながら、元画像に近づけるように学習し
ます。画像の壊れゆく過程と復元する過程を学習することで、ディテール
や質感を保持しながら、リアルな画像を生成することが可能です（図
7-22）。
多くの画像生成ツールで採用されている
DiffusionModelは、画像生成や画像変換などに応用できる有用な AI 技術
として、多くのAIサービスに採用されています。代表例として、英企業
StabilityAI 社のStableDiffusionは、オープンソースの生成 AI で、テキスト
から高品質な画像を生成します。また、Adobe社のFireflyは著作権リスク
が低く、商用利用にも安心のツールで、テキストからも画像からも画像生 ...
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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.