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• W2476987371 abstract "SIFT keypoint matching fails under night/day illumination changes.Image-registration relies on SIFTs and fails under night/day illumination changes.We propose a novel embedding formulation that accounts for illumination changes.The embedding space includes temporal and spatial constraints.Video-registration method obtains state of the art results under lighting changes. With the spread of wearable devices and head mounted cameras, a wide range of application requiring precise user localization is now possible. In this paper we propose to treat the problem of obtaining the user position with respect to a known environment as a video registration problem. Video registration, i.e.the task of aligning an input video sequence to a pre-built 3D model, relies on a matching process of local keypoints extracted on the query sequence to a 3D point cloud. The overall registration performance is strictly tied to the actual quality of this 2D-3D matching, and can degrade if environmental conditions such as steep changes in lighting like the ones between day and night occur. To effectively register an egocentric video sequence under these conditions, we propose to tackle the source of the problem: the matching process. To overcome the shortcomings of standard matching techniques, we introduce a novel embedding space that allows us to obtain robust matches by jointly taking into account local descriptors, their spatial arrangement and their temporal robustness. The proposal is evaluated using unconstrained egocentric video sequences both in terms of matching quality and resulting registration performance using different 3D models of historical landmarks. The results show that the proposed method can outperform state of the art registration algorithms, in particular when dealing with the challenges of night and day sequences." @default.
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• W2476987371 date "2017-04-01" @default.
• W2476987371 modified "2023-09-27" @default.
• W2476987371 title "Video registration in egocentric vision under day and night illumination changes" @default.
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• W2476987371 doi "https://doi.org/10.1016/j.cviu.2016.09.010" @default.
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