4 research outputs found
A Grid-based Representation for Human Action Recognition
Human action recognition (HAR) in videos is a fundamental research topic in
computer vision. It consists mainly in understanding actions performed by
humans based on a sequence of visual observations. In recent years, HAR have
witnessed significant progress, especially with the emergence of deep learning
models. However, most of existing approaches for action recognition rely on
information that is not always relevant for this task, and are limited in the
way they fuse the temporal information. In this paper, we propose a novel
method for human action recognition that encodes efficiently the most
discriminative appearance information of an action with explicit attention on
representative pose features, into a new compact grid representation. Our GRAR
(Grid-based Representation for Action Recognition) method is tested on several
benchmark datasets demonstrating that our model can accurately recognize human
actions, despite intra-class appearance variations and occlusion challenges.Comment: Accepted on 25th International Conference on Pattern Recognition
(ICPR 2020
ActAR: Actor-Driven Pose Embeddings for Video Action Recognition
Human action recognition (HAR) in videos is one of the core tasks of video
understanding. Based on video sequences, the goal is to recognize actions
performed by humans. While HAR has received much attention in the visible
spectrum, action recognition in infrared videos is little studied. Accurate
recognition of human actions in the infrared domain is a highly challenging
task because of the redundant and indistinguishable texture features present in
the sequence. Furthermore, in some cases, challenges arise from the irrelevant
information induced by the presence of multiple active persons not contributing
to the actual action of interest. Therefore, most existing methods consider a
standard paradigm that does not take into account these challenges, which is in
some part due to the ambiguous definition of the recognition task in some
cases. In this paper, we propose a new method that simultaneously learns to
recognize efficiently human actions in the infrared spectrum, while
automatically identifying the key-actors performing the action without using
any prior knowledge or explicit annotations. Our method is composed of three
stages. In the first stage, optical flow-based key-actor identification is
performed. Then for each key-actor, we estimate key-poses that will guide the
frame selection process. A scale-invariant encoding process along with embedded
pose filtering are performed in order to enhance the quality of action
representations. Experimental results on InfAR dataset show that our proposed
model achieves promising recognition performance and learns useful action
representations
Clinical and genetic data of Huntington disease in Moroccan patients
Background: Huntington's disease (HD) occurs worldwide with prevalence varying from 0.1 to 10 /100,000 depending of the ethnic origin. Since no data is available in the Maghreb population, the aim of this study is to describe clinical and genetic characteristics of Huntington patients of Moroccan origin.Methods: Clinical and genetics data of 21 consecutive patients recruited from 2009 to 2014 from the outpatient clinic of six medical centers were analyzed. Statistical analysis was performed using descriptive statistics.Results: Twenty one patients from 17 families were diagnosed positive for the IT15 gene CAG expansion. Clinical symptoms were predominantly motor (19/21). Twelve patients had psychiatric and behavioral disorders, and 11 patients had cognitive disorders essentially of memory impairment. Analysis of genetic results showed that 5 patients had reduced penetrant (RP) alleles and 16 had fully penetrant (FP) alleles. The mean CAG repeat length in patients with RP alleles was 38.4 ± 0.54, and 45.37 ± 8.30 in FP alleles. The age of onset and the size of the CAG repeat length showed significant inverse correlation (p <0.001, r = -0.754).Conclusion: Clinical and genetic data of Moroccan patients are similar to those of Caucasian populations previously reported in the literature.Keywords: Huntington disease/diagnosis, Huntington disease/epidemiology, Huntington disease/genetics, Trinucleotide repeat expansio
Clinical and genetic data of Huntington disease in Moroccan patients
Background: Huntington's disease (HD) occurs worldwide with prevalence
varying from 0.1 to 10 /100,000 depending of the ethnic origin. Since
no data is available in the Maghreb population, the aim of this study
is to describe clinical and genetic characteristics of Huntington
patients of Moroccan origin. Methods: Clinical and genetics data of 21
consecutive patients recruited from 2009 to 2014 from the outpatient
clinic of six medical centers were analyzed. Statistical analysis was
performed using descriptive statistics. Results: Twenty one patients
from 17 families were diagnosed positive for the IT15 gene CAG
expansion. Clinical symptoms were predominantly motor (19/21). Twelve
patients had psychiatric and behavioral disorders, and 11 patients had
cognitive disorders essentially of memory impairment. Analysis of
genetic results showed that 5 patients had reduced penetrant (RP)
alleles and 16 had fully penetrant (FP) alleles. The mean CAG repeat
length in patients with RP alleles was 38.4 \ub1 0.54, and 45.37
\ub1 8.30 in FP alleles. The age of onset and the size of the CAG
repeat length showed significant inverse correlation (p <0.001, r =
-0.754). Conclusion: Clinical and genetic data of Moroccan patients are
similar to those of Caucasian populations previously reported in the
literature