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Advances in Fuzzy Systems
Volume 2012, Article ID 671851, 8 pages
Research Article

A Fuzzy Logic-Based Video Subtitle and Caption Coloring System

1Department of Electrical Engineering, Islamic Azad University, Hidaj Branch, Hidaj, Iran
2Department of Electrical Engineering, Amirkabir University of Technology, Hafez Street, Tehran 15875, Iran
3Energy Department, Politecnico di Milano, Via La Masa 34, 20156 Milan, Italy
4Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, Iran

Received 15 October 2011; Accepted 31 January 2012

Academic Editor: Erich Klement

Copyright © 2012 Mohsen Davoudi et al. 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.


An approach has been proposed for automatic adaptive subtitle coloring using fuzzy logic-based algorithm. This system changes the color of the video subtitle/caption to “pleasant” color according to color harmony and the visual perception of the image background colors. In the fuzzy analyzer unit, using RGB histograms of background image, the R, G, and B values for the color of the subtitle/caption are computed using fixed fuzzy IF-THEN rules fully driven from the color harmony theories to satisfy complementary color and subtitle-background color harmony conditions. A real-time hardware structure has been proposed for implementation of the front-end processing unit as well as the fuzzy analyzer unit.