June 3, 2010 report
New surveillance camera system provides text feed
The system was developed by Professor Song-Chun Zhu and colleagues Haifeng Gong and Benjamin Yao, in collaboration with the company ObjectVideo, of Reston Virginia in the US. Dubbed I2T for Image to Text, the system runs video frames through a series of vision algorithms to produce a textual summary of the contents of the frames. The text can then be indexed and stored in a database that can be searched using a simple text search. The system has been successfully demonstrated on surveillance footage.
The I2T system draws on a database of over two million images containing identified objects in over 500 classifications. The database was collected by Zhu starting in 2005 in Ezhou, China, with support from the Chinese government, but is still not large enough to allow the system to assess a dynamic situation correctly.
The first process in I2T is an image parser that analyzes an image and removes the background and identifies the shapes in the picture. The second part of the process determines the meanings of the shapes by referring to the image database. Zhu said that once the image is parsed transcribing the results into natural language “is not too hard.”
The system also uses algorithms describing the movement of objects from one frame to another and can generate text describing motions, such as “boat 3 approaches maritime marker at 40:01.” It can also sometimes match objects that have left and then re-entered a scene, and can describe events such as a car running a stop sign.
Professor Zhu said at the moment almost all searches for images within video is done using surrounding text, but the new system directly generates text from the images. He also added that the existence of YouTube and other video collections, and the expanding use of surveillance cameras everywhere show that being unable to efficiently search video is a major problem.
The I2T system is not yet advanced enough to recognize a large number of images instantly and is not ready yet for commercialization, but the researchers say it is close and needs only “minor tweaks.” The scientists also say they may be able to feed the text into a vocal synthesizer to increase its usefulness.
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-- Research paper: Benjamin Yao, et al. I2T: Image Parsing to Text Description, Proceedings of IEEE [pdf].
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