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Retina Exercise

Published: Tuesday, 24 December 2013

Retina Image

Retina Image

Task: Extract the micro-aneurisms of the retina image.

Approach: Aneurisms are considered as residuals of openings, hence extracted by top-hats. Three openings are compared: hexagonal, union of linear ones, reconstruction.

Keywords: opening by adjunction, opening by reconstruction, anisotropy, residual, top hat.


Thresholded tophats by different structuring elements: by 8 connected square (left), by single segment (center), by opening by reconstruction using the union of linear openings as marker (right).

Structuring element for family of linear openings

Comments: The structuring element here as seen is important to determine the shape of the background features that need to be removed by the tophat. The next improvement is due to the reconstruction by opening of the Input image using the (linear structuring element) opened Image as Marker. This removes small local minimas and preserves the large ones that correspond to the anneurisms.

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