Feature-Based Retinal Image Registration Using D-Saddle Feature
Retinal image registration is important to assist diagnosis and monitor retinal diseases, such as diabetic retinopathy and glaucoma. However, registering retinal images for various registration applications requires the detection and distribution of feature points on the low-quality region that co...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Publishing Corporation
2017
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| Subjects: | |
| Online Access: | http://eprints.usm.my/39118/ http://eprints.usm.my/39118/1/Feature-Based_Retinal_Image_Registration_Using_D-Saddle_Feature.pdf |
| Summary: | Retinal image registration is important to assist diagnosis and monitor retinal diseases, such as diabetic retinopathy and glaucoma.
However, registering retinal images for various registration applications requires the detection and distribution of feature points on
the low-quality region that consists of vessels of varying contrast and sizes. A recent feature detector known as Saddle detects feature
points on vessels that are poorly distributed and densely positioned on strong contrast vessels. Therefore, we propose a
multiresolution difference of Gaussian pyramid with Saddle detector (D-Saddle) to detect feature points on the low-quality
region that consists of vessels with varying contrast and sizes. D-Saddle is tested on Fundus Image Registration (FIRE) Dataset that
consists of 134 retinal image pairs. Experimental results show that D-Saddle successfully registered 43% of retinal image pairs with
average registration accuracy of 2.329 pixels while a lower success rate is observed in other four state-of-the-art retinal image
registration methods GDB-ICP (28%), Harris-PIIFD (4%), H-M (16%), and Saddle (16%). Furthermore, the registration accuracy
of D-Saddle has the weakest correlation (Spearman) with the intensity uniformity metric among all methods. Finally, the
paired t-test shows that D-Saddle significantly improved the overall registration accuracy of the original Saddle. |
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