title: A new analysis method for cataractous images taken by retroillumination photography.
abstract: Photographic data have been used to diagnose cataracts. In particular, retroillumination photographs are popular and useful owing to their clearness of whole images of crystalline lenses at a glance. A new procedure called grid method for the quantitative analysis of retroillumination photographs is proposed here. With this method a ratio of cataractous area to total area can be calculated by separating an image of a lens in grids, with a greater precision compared with the usual threshold method. Furthermore, based on a correlation check of the grid number and the resulting accuracy we determined that 25 grids is the optimal cutting for our grid method.
authors.affiliation: Kanazawa Institute of Technology, Ishikawa, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Miyauchi
authors.forename: S
authors.initials: S
authors.lastname: Mukai
authors.forename: Y
authors.initials: Y
authors.lastname: Sakamoto
mesh_terms: D002386:Cataract / Q000473:pathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007908:Lens, Crystalline / Q000473:pathology; D008029:Lighting / Q000379:methods; D010781:Photography; D015203:Reproducibility of Results