PhotoSketch is an emerging technology that has been creating a buzz lately. It allows users to sketch a scene that they require, which is then created in photo format using images from the web. The application is able to do this thanks to an array of various algorithms that selects appropriate images, discards unwanted ones and then blends them together to produce a composite, much like an artist would using Photoshop.
We present a system that composes a realistic picture from a simple freehand sketch annotated with text labels. The composed picture is generated by seamlessly stitching several photographs in agreement with the sketch and text labels; these are found by searching the Internet. Although online image search generates many inappropriate results, our system is able to automatically select suitable photographs to generate a high quality composition, using a filtering scheme to exclude undesirable images. We also provide a novel image blending algorithm to allow seamless image composition. Each blending result is given a numeric score, allowing us to find an optimal combination of discovered images. Experimental results show the method is very successful; we also evaluate our system using the results from two user studies.
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