Software Learns to Tag Photos Coppell TX

Thousands of online images from Flickr have already been tagged accurately by a new software program.

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Software Learns to Tag Photos

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U.S. researchers have released a new online program for automatically tagging images according to their content. In its first real-world test, the program processed thousands of publicly accessible images available on the photo-sharing site Flickr. At least one accurate tag was generated for 98 percent of all the pictures analysed.

The new software, called ALIPR (Automatic Linguistic Indexing of Pictures), uses a combination of statistical techniques to process an image and assign it a batch of 15 words, arranged in order of perceived relevance. These words may refer to a specific object within the picture, such as a "person" or "car," or to a more general theme, such as "outdoors" or "manmade."

For humans, deciphering an image is deceptively simple. And yet for computers, which can sort through millions of text documents with blistering speed and accuracy, identifying the content of an image remains a devilishly difficult task.

"Recognizing what an image is about semantically is one of the most difficult problems in AI," says Jia Li, a mathematician at Pennsylvania State University, in State College, who created the software with colleague James Wang, a member of the College of Information Sciences and Technology. "Objects in the real world are 3-D," Li explains. "When showing up in an image, they can vary vastly in color, shape, gesture, size, and position, and a computer usually has no prior knowledge about the variations."

Because a complex understanding of the world remains beyond the ability of computers, more-efficient vision-processing algorithms are needed to help them mimic human vision and intelligence.

ALIPR analyses an image pixel by pixel and applies a novel statistical method to calculate the probability that a particular word may describe its content. This involves examining the distribution of color and texture within the image and comparing these features with a stored database of words and images. Li and Wang trained their program using a commercial database containing around 50,000 images that had already been tagged.

Recently, they tested ALIPR on 5,411 previously unseen images available on the popular picture-sharing site Flickr. For 51 percent of these images, the first word generated by ALIPR appeared in users' tags. The program also produced at least one accurate word 98 percent of the time. The researchers employed images made publicly accessible by Flickr users, which were also openly accessible through Flickr's own Application Programming Interface.

By James Lee

Read article at techreview.com

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