Enhanced detection of normal retinal nerve-fiber striations using a charge-coupled device and digital filtering
| Autor: | Qian Wei, David W. Richards, R.P. Velthuizen, James R. Janesick, Arsham Dingizian, S. Thomas Elliot, Laurence P. Clarke |
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| Rok vydání: | 1993 |
| Předmět: |
Materials science
Pixel Noise (signal processing) business.industry Dynamic range Fundus Oculi Nerve fiber layer Optic Nerve Signal Processing Computer-Assisted Sensitivity and Specificity Sensory Systems Retina Cellular and Molecular Neuroscience Ophthalmology Digital image Optics medicine.anatomical_structure Nerve Fibers Filter (video) medicine Image Processing Computer-Assisted Humans Charge-coupled device business Digital filter |
| Zdroj: | Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie. 231(10) |
| ISSN: | 0721-832X |
| Popis: | We used a 1024 x 1024 pixel, 15-microns, 16-bit-encoding, multi-pin-phase charge-coupled device (CCD) to obtain images of the normal human retinal nerve fiber layer. This device, which operates at room temperature, offers significantly better signal-to-noise ratio, linearity, and dynamic range than do photographic film, video imaging techniques, or commercially available CCDs. We demonstrate the use of a nonlinear digital filter, together with filter windows, that enhances fine detail of NFL striations, while suppressing noise, in limited areas of the CCD images. High-sensitivity imaging of this type, together with appropriate digital processing, may prove useful in diagnosing and following nerve-fiber-layer damage due to glaucoma. |
| Databáze: | OpenAIRE |
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