【摘要】 在对视网膜图像成像特点分析的基础上 ,对视网膜图像辐射量畸变的原因进行了分析 ,提出采用同态滤波的方法进行辐射量畸变校正 ,并设计了相应的同态滤波器。通过和直方图均衡化及多段线性灰度拉伸方法的实验比较 ,可以看出此方法可以更多地保留图像中的细节 ,使得图像中的整体光照更加均匀更多还原

【Abstract】 The reasons of radiant distortion for retinal image are discussed based on the analysis of imaging system of ocular fundus, and the method of Homomorphic Filtering is used to calibrate the radiant distortion. According to the features of imaging system, the filter function of homomorphic system for retinal image is designed.The experiment result comparing with other methods, such as historm equilibria method and multi segment linear gray stretching method, shows that our method can retain many image details and make the brightness much more uniform.更多还原