HELIOTEST - Detection of Missing Dots from Printed Patterns

Heliotest strip


This project is a sub-project of larger industrial research project Papvision. The goal of this sub-project is to review and revise existing, and develop new methods for an automatic detection of missing dots from printed patterns, such as Heliotest assessment samples. The main goal is to propose new hardware and software solution which meet the industrial requirements for accuracy and reliability.

View film of Heliotest measurement system (Patent application #FI20050050):
Heliotest film logo Windows media (WMV) - low resolution (7MB) Windows media (WMV) - high resolution (34MB) MPEG1 - high resolution (42MB)



Prototype system for automatic inspection of Heliotest strips is ready (see video) and research continues.

Contact information

Lappeenranta University of Technology
Jarkko Vartiainen E-mail WWW Graduate researcher
Albert Sadovnikov E-mail WWW Graduate researcher
Joni Kämäräinen E-mail WWW Post-doc researcher
Lasse Lensu E-mail WWW Project manager, post-doc researcher
Heikki Kšlvišinen E-mail WWW Director, professor
Pasi Saarinen E-mail WWW Industry coordinator


Source code

  1. Not publicly available

Data sets

  1. Not publicly available

Links to other resources

Garnegie Mellon Near-Regular Texture DatabaseGood for general irregularity detection


Do not hesitate to to contact authors (e-mail, etc.) in order to retrieve copies or reprints of the following publications.

  1. Articles in international scientific journals with referee practice
    1. -
  2. Articles in international compilation works and in international scientific conference proceedings with referee practice
    1. Sadovnikov, A., Vartiainen, J. Kamarainen, J.-K., Lensu, L., Kälviäinen, H., Detection of Irregularities in Regular Dot Patterns, In Proc. of the IAPR Conf. on Machine Vision Applications (Tsukuba Science City, Japan, 2005), 380-383.

  3. Scientific monographs
    1. Sadovnikov, Albert, Automated Heliotest Inspection Using Machine Vision, MSc (Diploma) thesis, Lappeenranta University of Technology, 2003. (PDF 1.3M)

  4. Other scientific publications
    1. Sadovnikov, A., Vartiainen, J., Kamarainen, J.-K., Lensu, L., Kälviäinen, H. Detection of irregularities in regular dot patterns, Research Report 93, Lappeenranta University of Technology, Department of Information Technology, 2005. (PDF 500k)

    2. Vartiainen, J., Lensu, L., Kamarainen, J.-K., Sadovnikov, A., Kalviainen, H. , Detecting irregularities in regular patterns, In Proc. of the 18th Int. Conf. on Pattern Recognition (Hong Kong, 2006), to appear.

See the Papvision homepage for other documentation