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15 October 2009 Uniform color processing of scanned topographic maps based on SSR
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Proceedings Volume 7492, International Symposium on Spatial Analysis, Spatial-Temporal Data Modeling, and Data Mining; 74922F (2009) https://doi.org/10.1117/12.838791
Event: International Symposium on Spatial Analysis, Spatial-temporal Data Modeling, and Data Mining, 2009, Wuhan, China
Abstract
Nowadays, large amount of paper-based topographic maps are still existed in many government department. The scanned maps of them are very useful for research on city history migration, city planning and so on. However, the brightness of these maps is not uniform, and creases are existed, so uniform color process is always needed. If the classical Retinex algorithm is used, the map would have a low brightness and contrast ratio. Therefore, a normal intercepting SSR algorithm of linear extending is presented in this paper. This algorithm first uses the classical SSR algorithm to process the data, and then the average value of image and variance are introduced to do normal intercepting linear extending on the map. Experiment results show that, the improved SSR can not only efficiently eliminate creases and uniform the map brightness, but also increase the global brightness and contrast ratio. Moreover, this algorithm can also be used in the pretreatment of grid image registration, thus to enhance the precision, velocity and accuracy of registration.
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Zhongliang Fu, Chunya Tong, Lu Liu, and Yan Huang "Uniform color processing of scanned topographic maps based on SSR", Proc. SPIE 7492, International Symposium on Spatial Analysis, Spatial-Temporal Data Modeling, and Data Mining, 74922F (15 October 2009); https://doi.org/10.1117/12.838791
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