Slovakia

Sparse representation and compressive sensing theory is wide used in image processing with the core idea that given a transformation that describes a signal in sparse domain can be achieved a moore compact and thus compressed form of the signal through optimization. In this research discrete orthogonal moments transforms are applied in sparse representation and compressive sensing theory under the implementation of transformed-based compressive sensing. Finally a comparison take place between image moments transforms and DCT in compression and denoising. 

IWSSIP 2021

Moment transform-based Compressive Sensing in Image Processing

krawtchouk

tchebichef

compressive sensing

Promoted by the Brazilian Computer Society (SBC), the Brazilian Symposium on Multimedia and Web (WebMedia) is the main event of the theme in Brazil and an excellent opportunity for scientific and technical exchange among students, researchers and professionals in the areas of Multimedia, Hypermedia and Web. This year we will be celebrating to 26th edition of WebMedia, which will be held online from november 30th to December 4th .

Webmedia 2020’s programming includes:

– Technical sessions for the presentation of scientific papers
– National and international keynotes
– Panel with companies
– Workshops
– Short Courses
– Open community meetings

The topics of interest for submitting papers are:

– Web and Social Networks
– Multimedia
– Digital TV, Ubiquitous and Mobile Computing

Besides the main track, WebMedia 2020 will have in parallel the Tools and Applications Workshop, works Tools and Applications Workshop, the Workshop on Undergraduate Research Work and the Workshop The Future of Interactive.

The WebMedia 2020 organization is under the responsibility of the Programa de Pós-graduação Doutorado em Ciência da Computação – Associação UFMA/UFPI (DCCMAPI), do Programa de Pós-graduação em Ciência da Computação/ CCET (PPGCC), do Laboratory of Advanced Web Systems/UFMA (LAWS) e do Laboratório de Sistemas Multimídia/UFMA (TELEMÍDIA).).

#PartiuWebMedia2020 #WebMedia2020

WebMedia 2020

Promoted by the Brazilian Computer Society (SBC), the Brazilian Symposium on Multimedia and Web (WebMedia) is the main event of the theme in Brazil and an excellent opportunity for scientific and technical exchange among students, researchers and professionals in the areas of Multimedia, Hypermedia and Web.

technical paper


IWSSIP is an international conference that brings together researchers and developers from both academia and industry reporting the latest scientific and theoretical advances to discuss and debate major issues and state-of-the-art aspects on systems, signals and image processing.

###### For the session discussion, each author will be seated at individual breakout tables.  Please find which table they will be at here:
###### [QA table assignments in Gather.town](https://drive.google.com/file/d/1hBHOD_KF7NSsaTcpYcHCZslXJvQVxJQe/view?usp=sharing)

The goal of this paper is to study the impact of
elevation mask angle and observation geometry on the position
accuracy of Global Navigation Satellite Systems (GNSS). The
precision of the user's location measurement relies on the dynamic
interaction of many factors. In the last decade, with the upgrade
and deployment of new satellite systems, there is an increase
interest in positioning techniques based on GNSS. This study
provides a performance assessment for different elevation mask
angles validated with real data. Through experimental results is
shown that with higher masking angles, a decrease in the number
of visible satellites is obvious which causes an increase in dilution
of precision values. The correlation between the low number of
visible satellites and a weak user – satellite geometry causes a
deterioration in the users’ position accuracy.

A Study on Cut-Off Elevation Angle Impact on GNSS Position Accuracy

We propose a system for digital documentation and presentation of museum collection objects that goes beyond the object appearance and can capture the object function and tell a story associated with the object. Museum cura-tors can prepare, without programming, interactive digital storytelling expe-riences for visitors about the object creation, restoration or to learn about the cultural history and societal development.

Digital storytelling for learning with heritage artefacts

An event-based looming objects detection algorithm for asynchronous event-based cameras is presented. The algorithm is fast and accurate both in the detecting the correct number of objects as well as whether the objects are looming.

Event-based Looming Objects Detection

The aim of this paper is to present a method for source detection within unknown mixtures using several measurement modalities. Contrary to the well studied case of single source detection, this approach enables simultaneous detection of multiple sources by exploiting the mixing coefficients resulting from supervised linear unmixing and thresholded non-negative least squares. The first contribution of this work is to propose an automated procedure to compute an optimized binary classifier rule for each source independently using a database of known mixtures. The second contribution is to propose a global decision rule based on the fusion of the multimodal decisions using weighting schemes such as those used in multiple classifier systems (MCS). A real database of Ion Mobiliy Mass Spectrometry (IMMS) data is used to evaluate the detection performance. An increase of the detection accuracy is reached using the multiple thresholds within the independent classifiers approach as compared to single modality detection.

Supervised Mixture Analysis and Source Detection from Multimodal Measurements

"In this work, we present a viewpoint selection method specif-
ically designed for fibrous structures in a pre-operative context. A view
quality metric based on entropy was developed, which integrates the typ-
ical requirements of surgery planning. We applied our approach in the
case of cranial nerves surrounding skull base tumors. The relevance of the
viewpoints selected by our method was assessed qualitatively by a neu-
rosurgeon and quantitatively based on statistical tests. These viewpoints
were proven to have a high informative content, and therefore to enable a
good understanding and mental representation the 3D anatomical scene
in a pre-operative context."

Viewpoint selection for fibrous structures in a pre-operative context: application to cranial nerves surrounding skull base tumors

In this work we perform a detailed study in which we dissect whether or not the use of a dataset with only a single sample taken from some writers may skew the results. In this sense, we propose here what we call "Document Filter".

Document Filter for Writer Identification

"We create a compact 3D model-based gait feature out of
2D images using DensePose. We also design a CNN to show that the
obtained gait feature can be used to improve recognition. Results are
based on the publicly available CASIA-B dataset."

Gait Recognition with DensePose Energy Images

Monitoring plant growth with computer vision is an important topic in plant science. This monitoring can be challenging when plants are located in outdoor conditions due to light variations and other noises. On other hand, there is a lack of annotated datasets available for such outdoor environments to train machine learning algorithms while indoor similar datasets may be more easily available. In this communication, we investigate, for the first time to the best of our knowledge in plant imaging, how to take benefit from model trained in fully controlled environment to build model for an outdoor environment. This is illustrated with the prediction of seedling development from top view RGB images.  

Deep learning-based detection of seedling development from indoor to outdoor

"Due to the omnipresence of computers today, the need for forensic experts has increased. Much of the knowledge associated with digital forensics has become common and has found its way to universities through courses or study programs.
As with many other domains related to computer engineering, computer forensics is based on theoretical concepts which must become integrated into skills and those skills serve as foundations of competence. For example, computer forensics experts must be able to recover data from a deleted file or reconstruct the sequence of actions in a cyberattack. Assessment is, therefore, a necessary precondition of effective computer forensics training and outcomes evaluation. Skills related to computer forensics should be acquired through practice and assessed in an authentic environment, yet that is difficult to achieve since the development of a large number of custom problems for assessing them is timeconsuming. This paper describes an approach to addressing this issue with a system for automatic generation and scoring of individualized and authentic computer forensics problems. Problem types and system implementation details are described in the paper."

Computer forensics problem generator for competence assessment

"This work presents the computer vision and machine learn-
ing techniques used in an implementation of a prototype system to aid
on understanding DICOM exams. In such a way, all aspects included
from the image prepossessing to identification and final classification of
bone anomalies by the digital bone scintigraphy images are commended
in details. It is possible to state that these used techniques are very
promising, because although, there are few patients already included for
leaning, the results obtained in the tested phase achieved more than
seventy percent of correction when used with Decision Tree (DT) and
k-Nearest Neighbors (K-NN) classification algorithms."

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A Study on Cut-Off Elevation Angle Impact on GNSS Position Accuracy

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