Enhancing Character Recognition by Optimizing Focal Length
نویسندگان
چکیده
This paper proposes to use zooming function of digital cameras for robust character recognition and to control focal length for improving the performance even in dim light conditions. For this purpose, we determine the optimum focal length vs. camera-object distance through several recognition experiments. Recognition performance for insufficient illuminated images can be enhanced by adopting the optimum focal length. Experiments involving multiple fonts show that our method improves the recognition rates over a wide range of camera-object distances and illumination variations.
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