how to distinguish whether the generated video is 2D or 4D？

[Fancy93]

Very interesting work. I have a question: how to distinguish whether the generated video is 2D or 4D in the paper?

[wenqsun]

Thanks for your interest! In our paper, Fig. 4 shows the spatial- and temporal-variant videos, Fig. 5 shows the 3dgs renderings of spatial-variant videos, and Fig. 6 presents the novel-view videos of 4D scenes.

Is it clear now? Welcome to ask us if you have any questions.

[Fancy93]

Thanks for your kind reply, I have another question, is the input video 2D or 4D?

[wenqsun]

Hi, the input view video means the 4D scene video from the input view.

I should use clearer expression to emphasize the results in the paper. Thanks for your question.

[wenqsun]

I want to talk more about the input view video in Fig. 6. For the first row, we use the real-world video as the input view (front view) video and generate the 4D scene with our controllable video generation, which is used to generate the novel view videos below.

[Fancy93]

Oh, I see. You want to generate a scene with three perspectives, not a video, right?

[wenqsun]

Actually, we use not just three-view videos, but dozens of multi-view videos to reconstruct this 4D scene. In our paper, we only present 3 views.

[Fancy93]

so，How to distinguish whether the generated video is 2D or 4D？