Plan Image/video indexing



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tarix27.10.2017
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Plan



Image/video indexing



Text detection



Detection in an image



Plan



Videos vs. scanned documents



Videos vs. scanned documents



What is text? - character segmentation



What is text? - texture



What is text? - texture



What is text? - corners



What is text? - contrast & geometry



What is text? - color



Plan



Evaluation



Evaluation at different levels



Evaluation on rectangle level



Evaluation on rectangle level



Performance graphs



Performance graphs



Comparison of different detection algorithms



The influence of the test database



Plan



The local contrast method



The learning method



Geometrical features: baseline



Estimation of the text rectangle height



Features



Learning with Support Vector Machines



Plan





Detection in still images







Detection in video sequences



Character segmentation: examples



OCR results



TREC 2002



Conclusion



Outlook



Optional slides



The Bhattacharyya distance



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