1,096 research outputs found
Reflectance Hashing for Material Recognition
We introduce a novel method for using reflectance to identify materials.
Reflectance offers a unique signature of the material but is challenging to
measure and use for recognizing materials due to its high-dimensionality. In
this work, one-shot reflectance is captured using a unique optical camera
measuring {\it reflectance disks} where the pixel coordinates correspond to
surface viewing angles. The reflectance has class-specific stucture and angular
gradients computed in this reflectance space reveal the material class.
These reflectance disks encode discriminative information for efficient and
accurate material recognition. We introduce a framework called reflectance
hashing that models the reflectance disks with dictionary learning and binary
hashing. We demonstrate the effectiveness of reflectance hashing for material
recognition with a number of real-world materials
DeepLSH: Deep Locality-Sensitive Hash Learning for Fast and Efficient Near-Duplicate Crash Report Detection
Automatic crash bucketing is a crucial phase in the software development
process for efficiently triaging bug reports. It generally consists in grouping
similar reports through clustering techniques. However, with real-time
streaming bug collection, systems are needed to quickly answer the question:
What are the most similar bugs to a new one?, that is, efficiently find
near-duplicates. It is thus natural to consider nearest neighbors search to
tackle this problem and especially the well-known locality-sensitive hashing
(LSH) to deal with large datasets due to its sublinear performance and
theoretical guarantees on the similarity search accuracy. Surprisingly, LSH has
not been considered in the crash bucketing literature. It is indeed not trivial
to derive hash functions that satisfy the so-called locality-sensitive property
for the most advanced crash bucketing metrics. Consequently, we study in this
paper how to leverage LSH for this task. To be able to consider the most
relevant metrics used in the literature, we introduce DeepLSH, a Siamese DNN
architecture with an original loss function, that perfectly approximates the
locality-sensitivity property even for Jaccard and Cosine metrics for which
exact LSH solutions exist. We support this claim with a series of experiments
on an original dataset, which we make available
Adding Cues to Binary Feature Descriptors for Visual Place Recognition
In this paper we propose an approach to embed continuous and selector cues in
binary feature descriptors used for visual place recognition. The embedding is
achieved by extending each feature descriptor with a binary string that encodes
a cue and supports the Hamming distance metric. Augmenting the descriptors in
such a way has the advantage of being transparent to the procedure used to
compare them. We present two concrete applications of our methodology,
demonstrating the two considered types of cues. In addition to that, we
conducted on these applications a broad quantitative and comparative evaluation
covering five benchmark datasets and several state-of-the-art image retrieval
approaches in combination with various binary descriptor types.Comment: 8 pages, 8 figures, source: www.gitlab.com/srrg-software/srrg_bench,
submitted to ICRA 201
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