Visual saliency has recently attracted lots of research interest in the computer vision community. In this paper, we
propose a novel computational model for bottom-up saliency detection based on manifold learning. A typical graphbased
manifold learning algorithm, namely the diffusion map, is adopted for establishing our saliency model. In the
proposed method, firstly, a graph is constructed using low-level image features. Then, the diffusion map algorithm is
performed to learn the diffusion distances, which are utilized to derive the saliency measure. Compared to existing
saliency models, our method has the advantage of being able to capture the intrinsic nonlinear structures in the original
feature space. Moreover, due to the inherent characteristics of the diffusion map algorithm, our method can deal with the
multi-scale issue effectively, which is crucial to any saliency model. Experimental results on publicly available data
demonstrate that our method outperforms the state-of-the-art saliency models, both qualitatively and quantitatively.
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