25,749 research outputs found
Multiscale Tensor Decomposition and Rendering Equation Encoding for View Synthesis
Rendering novel views from captured multi-view images has made considerable
progress since the emergence of the neural radiance field. This paper aims to
further advance the quality of view synthesis by proposing a novel approach
dubbed the neural radiance feature field (NRFF). We first propose a multiscale
tensor decomposition scheme to organize learnable features so as to represent
scenes from coarse to fine scales. We demonstrate many benefits of the proposed
multiscale representation, including more accurate scene shape and appearance
reconstruction, and faster convergence compared with the single-scale
representation. Instead of encoding view directions to model view-dependent
effects, we further propose to encode the rendering equation in the feature
space by employing the anisotropic spherical Gaussian mixture predicted from
the proposed multiscale representation. The proposed NRFF improves
state-of-the-art rendering results by over 1 dB in PSNR on both the NeRF and
NSVF synthetic datasets. A significant improvement has also been observed on
the real-world Tanks & Temples dataset. Code can be found at
https://github.com/imkanghan/nrff
Arbitrary beam control using passive lossless metasurfaces enabled by orthogonally-polarized custom surface waves
For passive, lossless impenetrable metasurfaces, a design technique for
arbitrary beam control of receiving, guiding, and launching is presented.
Arbitrary control is enabled by a custom surface wave in an orthogonal
polarization such that its addition to the incident (input) and the desired
scattered (output) fields is supported by a reactive surface impedance
everywhere on the reflecting surface. Such a custom surface wave (SW) takes the
form of an evanescent wave propagating along the surface with a spatially
varying envelope. A growing SW appears when an illuminating beam is received.
The SW amplitude stays constant when power is guided along the surface. The
amplitude diminishes as a propagating wave (PW) is launched from the surface as
a leaky wave. The resulting reactive tensor impedance profile may be realized
as an array of anisotropic metallic resonators printed on a grounded dielectric
substrate. Illustrative design examples of a Gaussian beam
translator-reflector, a probe-fed beam launcher, and a near-field focusing lens
are provided
Texture Mixer: A Network for Controllable Synthesis and Interpolation of Texture
This paper addresses the problem of interpolating visual textures. We
formulate this problem by requiring (1) by-example controllability and (2)
realistic and smooth interpolation among an arbitrary number of texture
samples. To solve it we propose a neural network trained simultaneously on a
reconstruction task and a generation task, which can project texture examples
onto a latent space where they can be linearly interpolated and projected back
onto the image domain, thus ensuring both intuitive control and realistic
results. We show our method outperforms a number of baselines according to a
comprehensive suite of metrics as well as a user study. We further show several
applications based on our technique, which include texture brush, texture
dissolve, and animal hybridization.Comment: Accepted to CVPR'1
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