Recent studies in saliency detection have exploited contrast value as a main feature and background prior as a secondary feature. To apply the background prior, most approaches are based on soft- or hard-segmentation mechanisms, and a significant improvement is seen. However, because of contrast feature usage, the soft-segmentation (SS)-wise models have many technical challenges when a high interobject dissimilarity exists. Although hard-segmentation-wise saliency models intuitively use the background prior without usage of the contrast feature, this model suffers from local noises due to undesirable discontinuous artifacts. By analyzing the drawbacks of the existing models, a combination saliency model, reflecting both soft- and hard-segmentation techniques is shown. The proposed model consists of the following three phases: SS-wise saliency, hard-segmentation-wise saliency, and a final saliency combination. In particular, we proposed an iterative reweighting processing for which an influence of outlier segmentation maps is decreased to improve the hard-segmentation-wise saliency. As shown in the experimental results, the proposed model outperforms the state-of-the-art models on various benchmark datasets, which consist of single, multiple, and complex object images.
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