Sketch-Based Image Retrieval Using Novel Edge Detector and Feature Descriptor

Figure 2

Comparison of two edge extraction algorithms. (a) Two natural images under the theme of “The Tower of London”; (b) the edge images obtained with the Canny operator; (c) the edge images obtained with the proposed GBME algorithm; (d) two hand-drawn sketches that are relevant to the theme; (e) two hand-drawn sketches that are nonrelevant to the theme.