9 research outputs found
Zoom-to-Inpaint: Image Inpainting with High-Frequency Details
Although deep learning has enabled a huge leap forward in image inpainting,
current methods are often unable to synthesize realistic high-frequency
details. In this paper, we propose applying super-resolution to coarsely
reconstructed outputs, refining them at high resolution, and then downscaling
the output to the original resolution. By introducing high-resolution images to
the refinement network, our framework is able to reconstruct finer details that
are usually smoothed out due to spectral bias - the tendency of neural networks
to reconstruct low frequencies better than high frequencies. To assist training
the refinement network on large upscaled holes, we propose a progressive
learning technique in which the size of the missing regions increases as
training progresses. Our zoom-in, refine and zoom-out strategy, combined with
high-resolution supervision and progressive learning, constitutes a
framework-agnostic approach for enhancing high-frequency details that can be
applied to any CNN-based inpainting method. We provide qualitative and
quantitative evaluations along with an ablation analysis to show the
effectiveness of our approach. This seemingly simple, yet powerful approach,
outperforms state-of-the-art inpainting methods
MyStyle: A Personalized Generative Prior
We introduce MyStyle, a personalized deep generative prior trained with a few
shots of an individual. MyStyle allows to reconstruct, enhance and edit images
of a specific person, such that the output is faithful to the person's key
facial characteristics. Given a small reference set of portrait images of a
person (~100), we tune the weights of a pretrained StyleGAN face generator to
form a local, low-dimensional, personalized manifold in the latent space. We
show that this manifold constitutes a personalized region that spans latent
codes associated with diverse portrait images of the individual. Moreover, we
demonstrate that we obtain a personalized generative prior, and propose a
unified approach to apply it to various ill-posed image enhancement problems,
such as inpainting and super-resolution, as well as semantic editing. Using the
personalized generative prior we obtain outputs that exhibit high-fidelity to
the input images and are also faithful to the key facial characteristics of the
individual in the reference set. We demonstrate our method with fair-use images
of numerous widely recognizable individuals for whom we have the prior
knowledge for a qualitative evaluation of the expected outcome. We evaluate our
approach against few-shots baselines and show that our personalized prior,
quantitatively and qualitatively, outperforms state-of-the-art alternatives.Comment: Project webpage: https://mystyle-personalized-prior.github.io/,
Video: https://youtu.be/QvOdQR3tlO
Investigation of the Dynamic Behavior of Bridged Nanotube Resonators by Dissipative Particle Dynamics Simulation
Optimization of the Trade-Off Between Speckle Reduction and Axial Resolution in Frequency Compounding
Biofunctionalization of Large Gold Nanorods Realizes Ultrahigh-Sensitivity Optical Imaging Agents
Biofunctionalization of Large Gold Nanorods Realizes Ultrahigh-Sensitivity Optical Imaging Agents
Gold nanorods (GNRs, ∼ 50
× 15 nm) have been used ubiquitously
in biomedicine for their optical properties, and many methods of GNR
biofunctionalization have been described. Recently, the synthesis
of larger-than-usual GNRs (LGNRs, ∼ 100 × 30 nm) has been
demonstrated. However, LGNRs have not been biofunctionalized and therefore
remain absent from biomedical literature to date. Here we report the
successful biofunctionalization of LGNRs, which produces highly stable
particles that exhibit a narrow spectral peak (FWHM ∼100 nm).
We further demonstrated that functionalized LGNRs can be used as highly
sensitive scattering contrast agents by detecting individual LGNRs
in clear liquids. Owing to their increased optical cross sections,
we found that LGNRs exhibited up to 32-fold greater backscattering
than conventional GNRs. We leveraged these enhanced optical properties
to detect LGNRs in the vasculature of live tumor-bearing mice. With
LGNR contrast enhancement, we were able to visualize tumor blood vessels
at depths that were otherwise undetectable. We expect that the particles
reported herein will enable immediate sensitivity improvements in
a wide array of biomedical imaging and sensing techniques that rely
on conventional GNRs