free-hand sketch based image and video retrieval
We present an overview of our work to date on a sketch based retrieval of image and video. We present a fast technique for extracting motion trajectories from videos and a Viterbi matching approach for retrieving video clips using free-hand sketched queries. For sketch based image retrieval, we introduce a depiction invariant image descriptor Gradient-Field-HOG (GF-HOG) that encapsulates local spatial structure in the sketch and facilitates efficient codebook based image retrieval driven by free-hand sketched queries. We further enhance the system with semantic information by incorporating user's search context.
video retrieval image retrieval sketch based visual search