Image and video analysis. Detection of text on images

Today we are publishing the last lecture of the course “Image and Video Analysis” given by Natalia Vasilyeva, Senior Researcher at HP Labs and Head of HP Labs Russia. Natalya Sergeevna gave a course on image analysis at the St. Petersburg Computer Science Center, which was created on the joint initiative of the Yandex Data Analysis School, JetBrains and CS Club.



In total, the program has nine lectures, of which have already been published:

1. Introduction to the course "Image and video analysis" ;
2. Basics of spatial and frequency image processing ;
3. Morphological image processing ;
4. Building the signs and comparing images: global signs ;
5. Construction of signs and comparison of images: local signs ;
6. Similarity search. Search for fuzzy duplicates ;
7. Classification of images and object recognition ;
8. Image and video analysis. Image segmentation .

Under the cut you will find a plan of the new lecture and slides.


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Components of the text extraction system:

• Applications.

Text detection - newspapers, magazines, books:

• Printed documents
• Projection profiles and XY-cuts
• Bottom-up methods
• Hough transform

Text detection - arbitrary images:

• Photo
• Stroke Width Transform (SWT)
• SWT text detection
• SWT calculation
• SWT text detection
• Combined methods
• ICDAR (2003, 2005, 2009, 2011)
• Text detection with unsupervised feature learning

Text detection - drawings and graphics:

• Graphs and Charts
• Experimental evaluation
• Screenshots
• Script dependency.