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BAG TECHNIQUE Bag technique-a tool making use of public health bag through wh...
Rich intrinsic image decomposition of outdoor scenes from multiple views
1. RICH INTRINSIC IMAGE DECOMPOSITION OF OUTDOOR SCENES
FROM MULTIPLE VIEWS
ABSTRACT:
Intrinsic images aim at separating an image into its reflectance and illumination components to
facilitate further analysis or manipulation. This separation is severely ill posed and the most
successful methods rely on user indications or precise geometry to resolve the ambiguities
inherent to this problem. In this paper, we propose a method to estimate intrinsic images from
multiple views of an outdoor scene without the need for precise geometry and with a few manual
steps to calibrate the input.
We use multiview stereo to automatically reconstruct a 3D point cloud of the scene. Although
this point cloud is sparse and incomplete, we show that it provides the necessary information to
compute plausible sky and indirect illumination at each 3D point. We then introduce an
optimization method to estimate sun visibility over the point cloud. This algorithm compensates
for the lack of accurate geometry and allows the extraction of precise shadows in the final image.
We finally propagate the information computed over the sparse point cloud to every pixel in the
photograph using image-guided propagation. Our propagation not only separates reflectance
from illumination, but also decomposes the illumination into a sun, sky, and indirect layer. This
rich decomposition allows novel image manipulations as demonstrated by our results.
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