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  • Contrast-weighted dictionar...
    Huang, Zhou; Chen, Huai-Xin; Zhou, Tao; Yang, Yun-Zhi; Wang, Chang-Yin; Liu, Bi-Yuan

    Pattern recognition, 20/May , Letnik: 113
    Journal Article

    •Considering the features of the training sample patch itself, we propose a novel atomic learning formula based on contrast weights. In addition, an online discriminative dictionary learning algorithm based on contrast weight (CDL) is proposed to solve the formula.•We use l1-norm and l2,1-norm to measure the sparsity and reconstruction errors of sparse coefficients, and then combine these two measures to improve the expression of “outliers” in the coefficients. In addition, we propose a saliency map fusion method based on global gradient optimization to optimize the fusion effect of multiple saliency maps.•Experimental results on four datasets show that the proposed model is very competitive with the state-of-the-art methods under six evaluation metrics, especially on the VSRS dataset. Display omitted Object detection in very high resolution (VHR) optical remote sensing (RS) images is one of the most fundamental but challenging tasks in the field of RS image analysis. To reduce the computational complexity of redundant information and improve the efficiency of image processing, visual saliency models have been widely applied in this field. In this paper, a novel saliency detection model based on Contrast-weighted Dictionary Learning (CDL) is proposed for VHR optical RS images. Specifically, the proposed CDL learns salient and non-salient atoms from positive and negative samples to construct a discriminant dictionary, in which a contrast-weighted term is proposed to encourage the contrast-weighted patterns to be present in the learned salient dictionary while discouraging them from being present in the non-salient dictionary. Then, we measure the saliency by combining the coefficients of the sparse representation (SR) and reconstruction errors. Furthermore, by using the proposed joint saliency measure, a variety of saliency maps are generated based on the discriminant dictionary. Finally, a fusion method based on global gradient optimization is proposed to integrate multiple saliency maps. Experimental results on four datasets demonstrate that the proposed model outperforms other state-of-the-art methods.