Direct Imaging Based Worm Egg Detection

A new microlens array based imaging concept was introduced to public at the ICPR 2012. The setup utilizes directly the microlens array for imaging without additional refractive optics. Also, only a single field aperture is utilized for the hundreds of microlenses making the structure very simple and thus also affordable.  The setup enables imaging a large microscopic sample with a single snapshot without spatial sample scanning. This opens attractive possibilities for fast sample screening.

A conceptual diagram of the imaging setup and an image of the actual prototype is shown below.

                                           

To illustrate the usability of the setup an application was developed to detect eggs of Schistosoma haematobium in urine samples. These parasitic worms cause bilharzia, also known as snail fever, which further increase vulnerability to other diseases, like HIV.

The developed worm egg finder relies on the LBP based cascade classifier where separate egg orientations are detected with separate classifiers in near real time manner.

The demonstration was presented in collaboration with VTT at the COMPAMED 2012, an International Trade Fair held on November 14th-16th in Düsseldor, Germany.

A screen capture of the worm egg detector in action is shown below. Two positive findings are circled with red for enhanced visibility.

References

Varjo S, Hannuksela J & Silvén O (2012)
Direct Imaging with Printed Microlens Arrays.
Proc. ICPR 2012, Nov. 11-15, 2012 Tsukuba, Japan

Last updated: 14.4.2015