4,712 research outputs found
Growing Regression Forests by Classification: Applications to Object Pose Estimation
In this work, we propose a novel node splitting method for regression trees
and incorporate it into the regression forest framework. Unlike traditional
binary splitting, where the splitting rule is selected from a predefined set of
binary splitting rules via trial-and-error, the proposed node splitting method
first finds clusters of the training data which at least locally minimize the
empirical loss without considering the input space. Then splitting rules which
preserve the found clusters as much as possible are determined by casting the
problem into a classification problem. Consequently, our new node splitting
method enjoys more freedom in choosing the splitting rules, resulting in more
efficient tree structures. In addition to the Euclidean target space, we
present a variant which can naturally deal with a circular target space by the
proper use of circular statistics. We apply the regression forest employing our
node splitting to head pose estimation (Euclidean target space) and car
direction estimation (circular target space) and demonstrate that the proposed
method significantly outperforms state-of-the-art methods (38.5% and 22.5%
error reduction respectively).Comment: Paper accepted by ECCV 201
Deep Adaptive Feature Embedding with Local Sample Distributions for Person Re-identification
Person re-identification (re-id) aims to match pedestrians observed by
disjoint camera views. It attracts increasing attention in computer vision due
to its importance to surveillance system. To combat the major challenge of
cross-view visual variations, deep embedding approaches are proposed by
learning a compact feature space from images such that the Euclidean distances
correspond to their cross-view similarity metric. However, the global Euclidean
distance cannot faithfully characterize the ideal similarity in a complex
visual feature space because features of pedestrian images exhibit unknown
distributions due to large variations in poses, illumination and occlusion.
Moreover, intra-personal training samples within a local range are robust to
guide deep embedding against uncontrolled variations, which however, cannot be
captured by a global Euclidean distance. In this paper, we study the problem of
person re-id by proposing a novel sampling to mine suitable \textit{positives}
(i.e. intra-class) within a local range to improve the deep embedding in the
context of large intra-class variations. Our method is capable of learning a
deep similarity metric adaptive to local sample structure by minimizing each
sample's local distances while propagating through the relationship between
samples to attain the whole intra-class minimization. To this end, a novel
objective function is proposed to jointly optimize similarity metric learning,
local positive mining and robust deep embedding. This yields local
discriminations by selecting local-ranged positive samples, and the learned
features are robust to dramatic intra-class variations. Experiments on
benchmarks show state-of-the-art results achieved by our method.Comment: Published on Pattern Recognitio
Double Self-weighted Multi-view Clustering via Adaptive View Fusion
Multi-view clustering has been applied in many real-world applications where
original data often contain noises. Some graph-based multi-view clustering
methods have been proposed to try to reduce the negative influence of noises.
However, previous graph-based multi-view clustering methods treat all features
equally even if there are redundant features or noises, which is obviously
unreasonable. In this paper, we propose a novel multi-view clustering framework
Double Self-weighted Multi-view Clustering (DSMC) to overcome the
aforementioned deficiency. DSMC performs double self-weighted operations to
remove redundant features and noises from each graph, thereby obtaining robust
graphs. For the first self-weighted operation, it assigns different weights to
different features by introducing an adaptive weight matrix, which can
reinforce the role of the important features in the joint representation and
make each graph robust. For the second self-weighting operation, it weights
different graphs by imposing an adaptive weight factor, which can assign larger
weights to more robust graphs. Furthermore, by designing an adaptive multiple
graphs fusion, we can fuse the features in the different graphs to integrate
these graphs for clustering. Experiments on six real-world datasets demonstrate
its advantages over other state-of-the-art multi-view clustering methods
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