Working Fields
Optics
At the present time, the group is starting a new line of research based on the analysis of the preocular tear film in eye photographies and videos. This new line of research is directed to the diagnosis of various tear dysfunction problems, like the "dry eye" condition.
We have developed a preliminary methodology to classify the tear lipid layer according to its texture into four main categories: color fringes, waves, open mesh and closed mesh. The proposed methodology works on several stages to detect the region of interest, extract the texture descriptors on colour information and classify these descriptors. The method has been tested on several images from each tear type with a 90% accuracy in some categories.
Public dataset
The VOPTICAL dataset contains 548 images of the preocular tear film taken over varying illumination conditions. 41 images belong to the color fringe, 89 to the wave, 159 to the open mesh and 118 to the closed mesh categories. The dataset also contains 131 images with mixed categories in different proportions. All the images have a spatial resolution of 1024x768 pixels and have been acquired with the TearScopePlus (Keeler, Windsor, United Kingdom).