  The visual analysis of retina and of its vascular characteristics is
important in the diagnosis and monitoring of diseases of visual perception. In
the related medical diagnoses, the digital processing of the fundus images is
used to obtain the segmentation of retinal vessels. However, an image
segmentation is often requiring methods based on peculiar or complex
algorithms: in this paper we will show some alternative approaches obtained by
applying freely available tools to enhance, without a specific segmentation,
the images of the fundus of the eye. We will see in particular, that combining
the use of GIMP, the GNU Image Manipulation Program, with the wavelet filter of
Iris, a program well-known for processing astronomical images, the result is
giving images which can be alternative of those obtained from segmentation.

Computer Vision and Pattern Recognition