2,763 research outputs found
Self-supervised Outdoor Scene Relighting
Outdoor scene relighting is a challenging problem that requires good
understanding of the scene geometry, illumination and albedo. Current
techniques are completely supervised, requiring high quality synthetic
renderings to train a solution. Such renderings are synthesized using priors
learned from limited data. In contrast, we propose a self-supervised approach
for relighting. Our approach is trained only on corpora of images collected
from the internet without any user-supervision. This virtually endless source
of training data allows training a general relighting solution. Our approach
first decomposes an image into its albedo, geometry and illumination. A novel
relighting is then produced by modifying the illumination parameters. Our
solution capture shadow using a dedicated shadow prediction map, and does not
rely on accurate geometry estimation. We evaluate our technique subjectively
and objectively using a new dataset with ground-truth relighting. Results show
the ability of our technique to produce photo-realistic and physically
plausible results, that generalizes to unseen scenes.Comment: Published in ECCV '20,
http://gvv.mpi-inf.mpg.de/projects/SelfRelight
Examining trade-offs between social, psychological, and energy potential of urban form
Urban planners are often challenged with the task of developing design solutions which must meet multiple, and often contradictory, criteria. In this paper, we investigated the trade-offs between social, psychological, and energy potential of the fundamental elements of urban form: the street network and the building massing. Since formal methods to evaluate urban form from the psychological and social point of view are not readily available, we developed a methodological framework to quantify these criteria as the first contribution in this paper. To evaluate the psychological potential, we conducted a three-tiered empirical study starting from real world environments and then abstracting them to virtual environments. In each context, the implicit (physiological) response and explicit (subjective) response of pedestrians were measured. To quantify the social potential, we developed a street network centrality-based measure of social accessibility. For the energy potential, we created an energy model to analyze the impact of pure geometric form on the energy demand of the building stock. The second contribution of this work is a method to identify distinct clusters of urban form and, for each, explore the trade-offs between the select design criteria. We applied this method to two case studies identifying nine types of urban form and their respective potential trade-offs, which are directly applicable for the assessment of strategic decisions regarding urban form during the early planning stages
OutCast: Outdoor Single-image Relighting with Cast Shadows
We propose a relighting method for outdoor images. Our method mainly focuses
on predicting cast shadows in arbitrary novel lighting directions from a single
image while also accounting for shading and global effects such the sun light
color and clouds. Previous solutions for this problem rely on reconstructing
occluder geometry, e.g. using multi-view stereo, which requires many images of
the scene. Instead, in this work we make use of a noisy off-the-shelf
single-image depth map estimation as a source of geometry. Whilst this can be a
good guide for some lighting effects, the resulting depth map quality is
insufficient for directly ray-tracing the shadows. Addressing this, we propose
a learned image space ray-marching layer that converts the approximate depth
map into a deep 3D representation that is fused into occlusion queries using a
learned traversal. Our proposed method achieves, for the first time,
state-of-the-art relighting results, with only a single image as input. For
supplementary material visit our project page at:
https://dgriffiths.uk/outcast.Comment: Eurographics 2022 - Accepte
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