The MS image search capability has added the ability to search for similar images. In a sense that it uses the similarity of pictures and not only tag descriptors to find images when you choose 'show similar images'. A quick test shows that perhaps 75% of results are reasonable. In a recent effort I looked at a number of image analysis, classification and tagging applications.
I previously mentioned the TinEye system. That system can be fed with an image and it finds similar images. General image similarity search is still difficult, but has a number of potential applications, including searching for copyrighted images that have been minimally transformed. Will revisit MS's work and TinEye.
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