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The direction of sunlight is an important informative cue in a number of applications in image processing, such as augmented reality and object recognition. In general, existing methods to estimate the direction of the sunlight rely on different image features (e.g., sky, texture, shadows, and shading). These features can be considered as weak informative cues as no single feature can reliably estimate...
This paper proposes a novel tensor based dimensionality reduction algorithm called Multilinear Isometric Embedding (MIE) based on a representative manifold learning algorithm Isomap. Unlike Isomap that unfolds input data to the vector form, MIE directly works on more general tensor representation and utilizes iterative strategy to seek the low-dimensional equivalence, which best preserves the global...
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