Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure-preserving Guided Retinal Image Filtering and Its Application
  for Optic Disc Analysis   Retinal fundus photographs have been used in the diagnosis of many ocular
diseases such as glaucoma, pathological myopia, age-related macular
degeneration and diabetic retinopathy. With the development of computer
science, computer aided diagnosis has been developed to process and analyse the
retinal images automatically. One of the challenges in the analysis is that the
quality of the retinal image is often degraded. For example, a cataract in
human lens will attenuate the retinal image, just as a cloudy camera lens which
reduces the quality of a photograph. It often obscures the details in the
retinal images and posts challenges in retinal image processing and analysing
tasks. In this paper, we approximate the degradation of the retinal images as a
combination of human-lens attenuation and scattering. A novel
structure-preserving guided retinal image filtering (SGRIF) is then proposed to
restore images based on the attenuation and scattering model. The proposed
SGRIF consists of a step of global structure transferring and a step of global
edge-preserving smoothing. Our results show that the proposed SGRIF method is
able to improve the contrast of retinal images, measured by histogram flatness
measure, histogram spread and variability of local luminosity. In addition, we
further explored the benefits of SGRIF for subsequent retinal image processing
and analysing tasks. In the two applications of deep learning based optic cup
segmentation and sparse learning based cup-to-disc ratio (CDR) computation, our
results show that we are able to achieve more accurate optic cup segmentation
and CDR measurements from images processed by SGRIF.

33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph