Gradient field descriptor for sketch based retrieval and localization

We present an image retrieval system driven by free-hand sketched queries depicting shape. We introduce Gradient Field HoG (GF-HOG) as a depiction invariant image descriptor, encapsulating local spatial structure in the sketch and facilitating efficient codebook based retrieval. We show improved retrieval accuracy over 3 leading descriptors (Self Similarity, SIFT, HoG) across two datasets (Flickr160, ETHZ extended objects), and explain how GF-HOG can be combined with RANSAC to localize sketched objects within relevant images. We also demonstrate a prototype sketch driven photo montage application based on our system.

• Type: Journal
• Year: 2010
• Where: ICIP
• Authors: Rui Hu, Mark Barnard, John P. Collomosse
• Keywords: Codebook Based Retrieval, Gradient Field HoG, ICIP 2010, Image Processing, Invariant Image Descriptor