This paper describes an image descriptor that allows retrieval of images from a database based on a sketched drawing as input. The descriptor, a Tensor descriptor, is proposed for use in stead of an edge histogram descriptor. The tensor descriptor works by finding the direction of the image gradient in subsections of the image. This descriptor is calculated for every image in the database, then it is calculated for the sketch that is submitted for querying and the descriptors in the database are compared against it. The tensor's performance was better than the edge histogram and subjectively the users of the system preferred the results returned by the tensor.
Discussion
Where can I find one of these? It would be a great way for artists to search for material, for people to be able to look up places or things that they remember visually. It would be interesting to try to visualize your own dreams by sketching out thoughts and seeing what is returned by the search. I hope that Flickr or some other large scale repository picks up on this as a search technique.
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