基于人眼视觉的小波域结构相似性图像质量客观评价方法

针对空域结构相似性评价方法在几何失真图像及噪声污染图像的质量评价中存在的不足,在考虑人眼视觉特性前提下,研究了一种基于人眼视觉的小波域结构相似度的图像质量评价方法(WDSSIM)。该方法首先将参考图像和失真图像进行小波变换,以获取不同尺度和频带的子带图像,并根据人眼视觉JND模型,获取人眼视觉对参考图像的带间敏感度和各子带的带内敏感度;然后,以带内敏感度因子为权值分别求取参考图像和失真图像同一尺度和频带的子带图像之间的结构相似度;最后,以带间敏感度因子为权值对各子带对的结构相似度进行加权归一化,获得整幅图像的结构相似度。实验结果表明,WDSSIM方法符合人眼视觉特性,相比传统的客观评价方法,与主观评价结果的一致性更好。

基于域相关性与流形约束的多源域迁移学习分类算法

针对传统机器学习要求训练样本和测试样本具有相同分布的假设在实际应用中难以满足的问题,进行了迁移学习的研究。当源域与目标域的相关性较小时,粗暴式地强制性迁移不仅不能促进目标域学习,甚至会降低学习性能,即出现负迁移问题。为此,提出了一种基于多重相似性的多源域迁移学习方法。该方法首先从域—域和样本—域两个层面来更加准确地衡量目标域与多个源域的相关性;然后根据目标域分类器与相关源域分类器对目标域无标记样本具有相似决策值的平滑性流形假设,实现源域知识向目标域迁移的目的。在公共数据集上的实验结果表明,所提出的迁移学习方法不仅能够从多个不同源域中挖掘更多的知识用于目标域学习,而且能够根据域间相似性有选择地进行迁移,可以有效地避免负迁移问题。

Group Structure of Stabilizer of 2×2 Matrix under Similarity Action

This paper determines the group structure of stabilizer of 2×2 matrix under similarity action over arbitrary field. Then, the cardinal number of any orbit is calculated over finite field.

Postmodernism and Classical Chinese Philosophy

While over two thousand years apart, Western postmodernism and ancient Chinese philosophy share some extraordinary similarities, especially epistemology wise. For example, they both recognize the role of language in constructing, and limiting, knowledge and reality. This is because thinkers of different cultures and geographical regions, and of different historical periods, can possibly come up with similar philosophical conclusions when addressing what is commonly known as the ＂human condition＂. The paper will discuss, in general terms, some of the philosophical similarities between postmodemism and classical Chinese philosophy; it will also take a close look at three concepts in Chinese philosophy that register strong affinity with Western postmodernism： namely, change, dialectic, and relativism.