Research

MAIN RESEARCH INTERESTS

  • Gesture recognition based on sEMG & UltraSound signals and Deep Learning
  • Signal, Image and Video Processing / Analysis
  • Image and Video Coding
  • HDR Image Compression
  • Data Hiding in Images and Video
  • Fast Transform Algorithms; Time / Space Optimisation of Computationally Intensive Algorithms
  • Digital Signal Processors and Microprocessors; Real-time implementation of DSP algorithms

For more information on the current research interests please consult the Publications, the DSIP projects and Student Projects web pages.

 

Reference ENF Recordings for Mainland Greece ...

Reference Electrical Network Frequency (ENF) signals from the Greek main power grid are recorded 24/7 at the Digital Signal and Image Processing Lab, ECE Dept, University of Patras, as of July 13, 2016.

NEW !!!      ENF Signal in Real-Time
The ENF signal graph for Mainland Greece in near Real-Time is depicted at http://enf4gr.ece.upatras.gr/  Free download is possible. The latest 200 ENF values and a histogram of the latest 12000 values are shown, along with additional statistical information. More details are included in the Technical Reports TR002 and TR003.
 

ENF Recordings - 2021/03 to Today

The system captures the power line signal and extracts the ENF signal for mainland Greece, 24/7. The ENF data are uploaded to the cloud for free download by all those who are using the ENF in their research, through the link.

The recordings are in .csv file format. More details about the system, as well as the Python code for the Raspberry, can be found in the Technical Report TR001.

 

Raw Power Grid Recordings - 2016/07 to 2021/03

Everyday 24 recordings (wav files), i.e. one wav file per hour, are produced and zipped in one file of approx. 150 MB. In the end of the day, the zip file is uploaded to the ftp server and is ready for download.

Reference (ground-truth) ENF signals are extracted from power grid recordings, measured by a signal recorder that is connected to a power outlet using a step-down transformer. Τhe signal is routed to the sound card and is recorded using the appropriate software. A sampling rate of 1 kHz is used.

The Matlab code for the extraction of the ENF signal from the power grid recording is available for free download here

The recordings of the main power grid of Greece are available for download from http://haradros.ece.upatras.gr/ under the directory ws-ENF-Recordigs-Greece/. In the same directory, The ENF-extract.zip file contains the MATLAB code for the extraction of the ENF signals of the power grid recordings.

To access the dataset, please send an Email to skodras@upatras.gr and you will receive the login and password info. Please provide your affiliation with your Email request (for statistical purposes).

Related work:

TRIANTAFYLLOPOULOS, A., KRILIS, I., FOLIADIS, A. and SKODRAS, A.N: "A Hilbert-Based Approach to the ENF Extraction Problem", Proc. IEICE Information and Communication Technology Forum 2016 (ICTF 2016), Patras, Greece, 6-8 July 2016.

https://www.dropbox.com/s/pzcf9neya4lqt1g/ans-c105.pdf?dl=0

http://www.ece.upatras.gr/skodras/index.php?id=publications 

 

EMG Dataset

The MyoUP (Myo University of Patras) database contains recordings from 8 intact subjects (3 females, 5 males; 1 left handed, 7 right handed; age 22.38 ± 1.06 years). The acquisition process was divided into three parts: 5 basic finger movements, 12 isotonic and isometric hand configurations and 5 grasping hand-gestures. The recording device used was the Myo Armband by Thalmic labs (8 dry sEMG channels and sampling frequency of 200Hz).

Demos of the acquisition process are on YouTube here & here

The sEMG dataset is available for free download here

 

PARTICIPATION IN PROGRAMMES

European:

National:

  • 2005 - 2009 GSRT (PENED 2003): "Research on New Methods for the Management and Transmission of Augmented Reality Data"
  • 2003 - 2005 GSRT (e-LEARNING): "Server for Teaching the Greek Language (EAGLE)"
  • 2003 - 2005 GSRT (PRAXE 2002): "IPR Protection System (STIGMA)"
  • 2003 - 2005 GSRT (PABET NE): "Development of on Integrated System for the Protection of IPR"
  • 2001 - 2003 GSRT (PABET): "Watermarking of Images"
  • 2000 - 2001 GSRT (EPET II): "Human Networks For the Dissemination of the S+T Knowledge for Teleworking"
  • 1998 - 2001 GSRT (YPER): "Watermarking of Digital Images"
  • 1995 - 1997 GSRT (EPET II): "Human Networks For the Dissemination of the S+T Knowledge"
  • 1994 - 1995 GSRT  (SYN): "Videoconferencing System In an Industrial Environment"
  • 1995 - 1996  GSRT (PABE): "Integrated Educational System for Mentally Handicapped Children"
  • 1987 - 1988 BILATERAL COOPERATION "Computer Based Diagnostic Methods for the Measurement of the Bio-impedance"
  • 1986 - 1987 GSRT "2-D Digital Filter Implementation"
  • 1986 - 1988 GSRT "Design and Construction of an Electronic Device for the Monitoring of Infants’ Heart and Brain Functioning"
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