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: Research Article Color Targets: Fiducials to Help Visually Impaired People Find Their Way by Camera Phone | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2007 Article ID 96357 13 pages doi 2007 96357 Research Article Color Targets Fiducials to Help Visually Impaired People Find Their Way by Camera Phone James Coughlan1 and Roberto Manduchi2 1 Rehabilitation Engineering Research Center Smith-Kettlewell Eye Research Institute San Francisco CA 94115 USA 2 University of California Santa Cruz CA 95064 USA Received 16 January 2007 Revised 10 May 2007 Accepted 2 August 2007 Recommended by Thierry Pun A major challenge faced by the blind and visually impaired population is that of wayfinding the ability of a person to find his or her way to a given destination. We propose a new wayfinding aid based on a camera cell phone which is held by the user to find and read aloud specially designed machine-readable signs which we call color targets in indoor environments labeling locations such as offices and restrooms . Our main technical innovation is that we have designed the color targets to be detected and located in fractions of a second on the cell phone CPU even at a distance of several meters. Once the sign has been quickly detected nearby information in the form of a barcode can be read an operation that typically requires more computational time. An important contribution of this paper is a principled method for optimizing the design of the color targets and the color target detection algorithm based on training data instead of relying on heuristic choices as in our previous work. We have implemented the system on Nokia 7610 cell phone and preliminary experiments with blind subjects demonstrate the feasibility of using the system as a real-time wayfinding aid. Copyright 2007 J. Coughlan and R. Manduchi. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION There .
