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Using dictionary atoms to reconstruct input vectors is of great interest in spare representation. However, a key challenge is how to find a proper dictionary. In this paper, we introduce an active dictionary learning (ADL) method which incorporates active learning criteria to select atoms for dictionary construction with the consideration of both classification and reconstruction errors. Specifically,...
The recently proposed single image super-resolution method which makes use of the theory of sampling signals with finite rate of innovation (FRI) can obtain the state-of-the-art performance. However, the FRI-based method might bring in artifacts in border areas because some values of edge pixels might be overcorrected, leading to extremely sharp edges. To address such issues, we propose an improved...
Research on image statistics suggests that image patches can be well represented as a sparse linear combination of elements from an appropriately over-complete dictionary. In this paper, an improved joint dictionary training scheme is introduced for the single image super resolution. By using different weight factors, the scheme balances two dictionaries in the high- and low- resolution spaces in...
This paper presents a novel construction method of compactly supported biorthogonal wavelet. In the course of design, two parameters are used to adjust the characteristics of wavelet. The attributes of biorthogonal wavelet such as supported interval, symmetry and vanishing moments can be chosen in processing of construction. By changing the scale factor and the sign factor, the required wavelet can...
In this paper, we propose an efficient intra refreshment algorithm, which can achieve both the global optimization in determining the intra refreshing ratio and the local accuracy in selecting the proper macroblocks to be intra coded before the current frame is actually encoded. Furthermore, incorporated with our proposed intra refreshment algorithm, an effective UEP scheme based on a dynamic FMO...
In this paper, redundant slices feature of the H.264/AVC codec is evaluated. In order to trade off compression efficiency and error robustness of a H.264/AVC codec with redundant slice capability, we propose a novel perceptual sensitivity based redundant slices coding scheme. The perceptually sensitive regions are determined by using a simple yet effective perceptual sensitivity analysis technique,...
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