Method for the instrumentation of sizes of retinal vessels in the fundus and apparatus therefor

摘要

The instrumentation of sizes of a retinal vessel in the fundus is carried out by measuring continuously the sizes of the retinal vessel changing in accordance with heart beats at a site preset on the arteriole or the venule of the retinal vessel from images of the retinal vessel in the fundus continuously taken by a television camera or other photographic means; and comparing a periodical change of the sizes of the arteriole or venule of the retinal vessel. Static images are extracted at a given interval from fundus images photographed continuously by a television camera or recorded in a video tape recorder and converted into digital image which, in turn, is subjected to image processing. A length of the processed image data is measured at a given site of the image data fetched at a given timing from a storage, and a graph of rectangular coordinates is formed with a time coordinate versus a coordinate of measured values.