Espinosa, Julián, Roig Hernández, Ana Belén, Mas, David, Hernández, Consuelo, Illueca Contri, Carlos
Video of the labelling of projected Placido rings through the scanning annulus
URI: http://hdl.handle.net/10045/21475
DOI: 
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Abstract: 
The Elliptical Scanning Algorithm is an effective method to individually detect and label the projected rings. It consecutively defines an elliptical annulus of one pixel wide which grows pixel by pixel and sweeps the image, from centre to periphery, until it detects and labels each whole ring. In a way, it works like a snake-annealing algorithm. Active contour models (snakes) are energy-minimising curves that deform to fit image features. Elliptical Scanning Algorithm changes its geometry in order to label reflected rings.
Keywords:Placido rings, Videokeratography, Corneal surface
video