On the multi-level embedding of crypto-image reversible data hiding

Crypto-space reversible image steganography has attracted increasing attention, given its ability to embed authentication information without revealing the image content. This paper presents an efficient reversible data hiding scheme for crypto-images: a block predictor is applied to compute prediction errors, then an adaptive block mapping algorithm is utilized to compress them whose amplitudes are within a small threshold, finally, this strategy can be applied in a multi-level manner to achieve a higher embedding capacity. Due to the correlations among adjacent pixels in the block, images can be sufficiently compressed to reserve abundant space for additional data embedding. Different from the prior arts, the compression code of the image is fully encrypted. Experimental results verify that the embedded data and original image can be perfectly recovered, the security is higher compared with the state-of-the-arts, and a significant improvement in the average embedding rate is achieved on two large-scale image datasets.     

结合超混沌系统和Logistic映射的视频图像加密算法

对视频图像使用传统的单幅图像加密算法,容易出现算法耗时长、效率低等问题。为提高视频图像加密效率,通过使用细胞神经网络（CNN）超混沌系统和Logistic混沌映射,提出一种单帧逐一加密和多帧组合加密相结合的算法。根据视频帧使用SHA-256生成Logistic初值,经过Logistic映射迭代得到Logistic混沌序列,利用生成的混沌序列对视频帧逐帧扩散。将视频帧以二进制的形式组合成一个矩阵,把根据组合矩阵产生的初值代入CNN超混沌系统,利用得到的混沌序列对组合矩阵进行置乱,视频所有帧各像素点扩散、置乱一步完成,从而缩短加密时间。在此基础上,将组合矩阵重新分解为单帧图像,得到最终加密的视频图像。实验结果表明,在算法中使用高维超混沌系统安全性更高,能够有效缩短加密视频图像的耗时,且能抵抗统计攻击、差分攻击和暴力攻击,具有较好的安全性。     

The use of mindmapping software for patent search and management

Modern information technologies and in particular the internet have revolutionized the patent information professionals' work in terms of speed of access and information comprehensiveness from both company internal and external digital sources. Here, I describe how the digital mindmapping technique can be used to complement existing intellectual property management software solutions to meet the challenge of optimizing and managing patent search workflows as well as to rapidly organise and access highly dynamic, heterogeneous and scattered patent information sources. Both eye catching and highly memorable and at the same time self-explanatory mindmapping examples are presented. These were designed to include basic and advanced level digital mindmapping features tailored to significantly speed up and maintain a high work quality level of patent search professionals. A special emphasis is put on the great benefit of organising and accessing the plethora of internet-based worldwide online patent registers through mindmapping, both in terms of managing the constantly changing deep links to the actual search options for e.g., legal status information, and keeping track of the offered level of content.     

汽车造型的工程属性与情感属性的映射关系研究

目的研究汽车造型中的工程属性与情感属性存在的映射和对应关系,以及对于设计评价的影响。方法通过文献研究和实验分析,揭示了汽车造型中的工程属性与情感属性的映射和转换关系。结论造型中的工程属性能与情感属性存在内在的映射与转化关系,可以提高设计方案在跨学科研发团队中的沟通效率,提高设计创意的"编码"和"解码"。对于汽车创意和评价具有重要的参考价值,可以提高设计方案在跨学科研发团队中的多向沟通效率,提高设计方案的接受度和可行性。     

由文本至口形的媒体变换技术的研究

本文根据汉语的发音特点,提出了由基本音素口形参数和预先建立的口形模型来生成各种音节相应的正面口形图象的方法,从而完成由文本至口形的媒体变换,首先我们建立变形物体运动模型,然后由此构造一个口唇的动态发音模型,最后采用纹理映射技术,由基本音素口形参数和动态发音模型合成正面发音口形的图象。     

Two is better than one: A diploid genotype for neural networks

In nature the genotype of many organisms exhibits diploidy, i.e., it includes two copies of every gene. In this paper we describe the results of simulations comparing the behavior of haploid and diploid populations of ecological neural networks living in both fixed and changing environments. We show that diploid genotypes create more variability in fitness in the population than haploid genotypes and buffer better environmental change; as a consequence, if one wants to obtain good results for both average and peak fitness in a single population one should choose a diploid population with an appropriate mutation rate. Some results of our simulations parallel biological findings.     

Some improved results on communication between information systems

To study the communication between information systems, Wang et al. [C. Wang, C. Wu, D. Chen, Q. Hu, C. Wu, Communicating between information systems, Information Sciences 178 (2008) 3228-3239] proposed two concepts of type-1 and type-2 consistent functions. Some properties of such functions and induced relation mappings have been investigated there. In this paper, we provide an improvement of the aforementioned work by disclosing the symmetric relationship between type-1 and type-2 consistent functions. We present more properties of consistent functions and induced relation mappings and improve upon several deficient assertions in the original work. In particular, we unify and extend type-1 and type-2 consistent functions into the so-called neighborhood-consistent functions. This provides a convenient means for studying the communication between information systems based on various neighborhoods.     

Spatial gamut mapping algorithms for cross‐display color reproduction

Abstract— Owing to the fast developments of computer networks and color imaging technologies, there is a tendency towards remote proofing in the printing or textile industries. More cases such as cross‐display color matching will occur in the future information society. The problems of color mismatching we usually find in cross‐display devices have been widely discussed today. In this paper, to achieve equivalent color matching between a sRGB monitor and an Adobe RGB monitor, the spatial gamut mapping algorithm (SGMA), which introduces sigmoidal tone mapping, multi‐mapping paths, and unsharp mask (USM) operation into a sRGB color‐management system, is proposed. According to the designs of USM locations, this proposed SGMA can be further developed into pre‐USM, post‐USM, and double‐USM types. Besides, two critical image characteristics, edge map and color histogram, are investigated to establish the relationship between image content and SGMA. The psychophysical experimental results show that double‐USM SGMA obtains better color matching than the other spatial types.     

具有QoS保障功能的服务网格资源映射策略

针对网格资源映射对用户的服务质量(QoS)偏好考虑不足的问题,对保障多维QoS的网格资源映射算法进行研究,从服务网格资源的多维QoS属性分析入手,在满足用户全局约束的前提下,根据服务中各子任务的QoS约束筛选出符合要求的网格资源,并给出合理的映射结果,提出一种网格资源映射算法——QoS-Sufferage算法。利用GridSim平台进行仿真比较,结果验证了算法的有效性。     

格式兼容的视频加密算法设计与实现

现有格式兼容的加密算法在安全性、可操作性和解码耗时等方面各有优劣。针对上述情况,提出一种新的视频加密算法。该算法根据MPEG视频标准,通过改变宏块条竖直位置值进行置乱,实现图像的加密。理论分析与仿真实验结果证明,该算法简单易行,安全性高,加密数据量少,加密速度快,且对数据压缩率无影响。