title: Speckle reduction in optical coherence tomography imaging by affine-motion image registration.
abstract: Signal-degrading speckle is one factor that can reduce the quality of optical coherence tomography images. We demonstrate the use of a hierarchical model-based motion estimation processing scheme based on an affine-motion model to reduce speckle in optical coherence tomography imaging, by image registration and the averaging of multiple B-scans. The proposed technique is evaluated against other methods available in the literature. The results from a set of retinal images show the benefit of the proposed technique, which provides an improvement in signal-to-noise ratio of the square root of the number of averaged images, leading to clearer visual information in the averaged image. The benefits of the proposed technique are also explored in the case of ocular anterior segment imaging.
authors: Queensland University of Technology, Contact Lens and Visual Optics Laboratory, School of Optometry, Brisbane, QLD, Australia. d.alonsocaneiro@qut.edu.au
authors: David
authors: D
authors: Alonso-Caneiro
authors: Scott A
authors: SA
authors: Read
authors: Michael J
authors: MJ
authors: Collins
mesh_terms: D003315:Cornea / Q000033:anatomy & histology / Q000737:chemistry; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D012160:Retina / Q000033:anatomy & histology / Q000737:chemistry; D012815:Signal Processing, Computer-Assisted; D059629:Signal-To-Noise Ratio; D041623:Tomography, Optical Coherence / Q000379:methods*