Adaptive histogram equalization and its variations
Computer Vision, Graphics, and Image Processing
Journal of VLSI Signal Processing Systems
Real-Time Processing of Contrast Limited Adaptive Histogram Equalization on FPGA
FPL '10 Proceedings of the 2010 International Conference on Field Programmable Logic and Applications
Using adaptive tone mapping to enhance edge-preserving color image automatically
Journal on Image and Video Processing - Special issue on emerging methods for color image and video quality enhancement
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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.