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![[Mildenhall et al., ECCV2020]
• 3࣍࠲ݩඪ ( ) ͱࢹઢํ ( ) Λ
ೖྗͱًͯ͠ ( ) ͱີ Λ
ग़ྗ͢ΔNN (γʔϯؔ
)
• ༷ʑͳ͔֯ΒࡱͬͨࣸਅͰֶश
➡︎
ผͷ͔֯Βࡱͬͨࣸ...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-5-2048.jpg?cb=1666803398)
![NeRF
[Mildenhall et al., ECCV2020]
• γʔϯΛ3࣍࠲ݩඪͱࢹઢํ͔Βًͱີ ͷؔͱͯ͠දݱ
• ͜ͷ͕ؔΘ͔Δͱɺvolume renderingΛ༻͍ͯҙͷࢹ͔Βͷը૾Λ
ੜՄ...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-6-2048.jpg?cb=1666803398)
![[Mildenhall et al., ECCV2020]
• ֶशϨϯμϦϯάͨ͠ը૾ͱ
ਅͷը૾ͱͷ̎ࠩޡͷ࠷খԽ
• volume rendering͕ඍՄೳͳͷͰ
end-to-endʹֶशՄೳ
• ϨϯμϦϯά࣌ʹ...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-7-2048.jpg?cb=1666803398)
![[Mildenhall et al., ECCV2020]
Pros
• 3Dγʔϯͷදͯ͠ͱݱըظత
• ैདྷ܈ϝογϡͷΑ͏ͳ
ࢄͰߴίετͳදݱ
• NNΛͬͨimplicitͳදͰݱ
ෳࡶͳγʔ...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-8-2048.jpg?cb=1666803398)
![NeRF
[Mildenhall et al., ECCV2020]
Cons
• γʔϯ͝ͱʹஞҰϞσϧΛ࠷దԽ͢Δඞཁ͕͋Δ
• ະͷγʔϯ͕ಘΒΕͨΒɺͦͷʹϞσϧΛֶश͠ͳ͚ΕͳΒͳ͍
• γʔϯ͝ͱʹͨ͘͞Μͷը૾Λ...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-9-2048.jpg?cb=1666803398)
![[Eslami et al.,2018]
• 3࣍ݩγʔϯ෮ݩΛߦ͏VAE
• EncoderΛ༻͍ͯ৽͍͠γʔϯΛ
ߴʹ෮͖ͰݩΔ
• ϞσϧΈࠐΈϕʔε
• ৄ͘͠ླ͞Μͷࢿྉ[3]Λࢀর
GQN
10](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-10-2048.jpg?cb=1666803398)
![GQN
[Eslami et al.,2018]
• ࢹ ͔Βͨݟը૾Λ ͱ͠ɺγʔϯΛજࡏม Ͱදݱ
• VAEͱಉ༷ʹมԼքͷ࠷େԽͰֶश
c I z
z
I
c
log p ({Ik}
N
k=1
∣ {ck}
N
k=...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-11-2048.jpg?cb=1666803398)
![[Eslami et al.,2018]
৽͍͠γʔϯͷ෮ݩencoder ( )Λ
ͬͯߴʹͰ͖Δ
q
p (I ∣ c, {Ik, ck}
M
k=1)
≈
𝔼
q(z ∣ {Ik, ck}
M
k=1)
[p (I ∣ c,...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-12-2048.jpg?cb=1666803398)
![GQN
[Eslami et al.,2018]
Pros
• EncoderͰະγʔϯΛߴʹ
෮͖ͰݩΔ (amortized inference)
• ֶश࣌ؒͦ͜·Ͱ͔͔Βͳ͍
Cons
• زԿతͳใΛ...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-13-2048.jpg?cb=1666803398)
![References
[1] [DLྠಡձ]NeRF: Representing Scenes as Neural Radiance Fields for View
Synthesis (https://www.slideshare.net/D...](https://image.slidesharecdn.com/dlseminar20210416-210419040232/75/DL-NeRF-VAE-A-Geometry-Aware-3D-Scene-Generative-Model-24-2048.jpg?cb=1666803398)