Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Review Article Image and Video Processing for Visually Handicapped People | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2007 Article ID 25214 12 pages doi 2007 25214 Review Article Image and Video Processing for Visually Handicapped People Thierry Pun 1 Patrick Roth 1 Guido Bologna 2 Konstantinos Moustakas 3 and Dimitrios Tzovaras3 1 Computer Science Department University of Geneva Battelle Campus 7 Route de Drize 1227 Carouge Geneva Switzerland 2 Computer Science Department University of Applied Studies HES-SO 4 Rue de la Prairie 1202 Geneva Switzerland 3 Center for Research and Technology Hellas ITI CERTH Informatics and Telematics Institute 1st Km Thermi-Panorama Road . Box 361 57001 Thermi-Thessaloniki Greece Received 30 November 2007 Accepted 31 December 2007 Recommended by Alice Caplier This paper reviews the state of the art in the field of assistive devices for sight-handicapped people. It concentrates in particular on systems that use image and video processing for converting visual data into an alternate rendering modality that will be appropriate for a blind user. Such alternate modalities can be auditory haptic or a combination of both. There is thus the need for modality conversion from the visual modality to another one this is where image and video processing plays a crucial role. The possible alternate sensory channels are examined with the purpose of using them to present visual information to totally blind persons. Aids that are either already existing or still under development are then presented where a distinction is made according to the final output channel. Haptic encoding is the most often used by means of either tactile or combined tactile kinesthetic encoding of the visual data. Auditory encoding may lead to low-cost devices but there is need to handle high information loss incurred when transforming visual data to auditory one. Despite a higher technical complexity audio haptic encoding has the advantage of making use of all available user s sensory channels. .
