Embedded system for contrast enhancement in low-vision |
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| Affiliation: | 1. Computer Engineering Lab., Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands;2. CEA-Leti, Grenoble, France;3. Electronic Systems Group, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands;1. Department of General Psychology, Friedrich Schiller University of Jena, Jena, Germany;2. Faculty for Rehabilitation Sciences, TU Dortmund, Dortmund, Germany;3. Department of Counseling and Clinical Intervention, Friedrich Schiller University of Jena, Jena, Germany;4. Michael Stifel Center Jena for Data-Driven and Simulation Science, Friedrich Schiller University of Jena, Jena, Germany;5. DFG Research Unit Person Perception, Germany;6. Swiss Center for Affective Sciences, University of Geneva, Switzerland |
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| Abstract: | This paper presents a real-time contrast enhancement system, implemented in FPGA and adapted to display the processed images on a Head Mounted Display (HMD). A novel visual processing scheme is proposed which combines a version of the algorithm known as Contrast Limited Adaptive Histogram Equalization (CLAHE) with a spatial filtering based on a bio-inspired retina model. The system is designed so that visually impaired people can improve their functionality in environments with non-uniform lighting or with abrupt changes in lighting conditions. The parallelism offered by FPGA devices allow to achieve real-time processing with VGA-resolution images, reaching up to 60 frames per second. This system, developed on a FPGA of reduced complexity, has been compared in performance with a parallel implementation on a portable platform based on GPU. |
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