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With the rapid growth of 3D models on the Web, effective methods to retrieve appropriate 3D models are becoming crucial. In this paper, we propose a novel sketch-based 3D model retrieval approach which integrates the skeleton graph and contour feature. Skeleton graph represents the topology structure of the query sketch as well as representative 2D views of 3D models, and contour feature captures their detailed information. Moreover, A hierarchical coarse-to-fine searching strategy is employed in this method. Firstly, a skeleton graph based matching method is used to eliminate those 3D models which are dissimilar to the query sketch. Then, the selected candidate models are refined by measuring the similarity of their contour feature. In addition, we adopt a graph transduction method to improve the ranking order of the retrieved 3D models. The proposed method was tested on the public sketch benchmarks and compared with other leading sketch-based 3D model retrieval methods. The experiment results demonstrate that our approach can accurately retrieve desired 3D models for users and has a superior performance to other state-of-the-art approaches.

Nowadays, the state-of-the-art mobile visual sensors technology makes it easy to collect a great number of clothing images. Accordingly, there is an increasing demand for a new efficient method to retrieve clothing images by using mobile visual sensors. Different from traditional keyword-based and content-based image retrieval techniques, sketch-based image retrieval provides a more intuitive and natural way for users to clarify their search need. However, this is a challenging problem due to the large discrepancy between sketches and images. To tackle this problem, we present a new sketch-based clothing image retrieval algorithm based on sketch component segmentation. The proposed strategy is to first collect a large scale of clothing sketches and images and tag with semantic component labels for training dataset, and then, we employ conditional random field model to train a classifier which is used to segment query sketch into different components. After that, several feature descriptors are fused to describe each component and capture the topological information. Finally, a dynamic component-weighting strategy is established to boost the effect of important components when measuring similarities. The approach is evaluated on a large, real-world clothing image dataset, and experimental results demonstrate the effectiveness and good performance of the proposed method.