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Visual Cryptography Scheme (VCS) is a secret-sharing scheme which aims to encrypt a secret message into multiple shares and transmit them to participants over an untrusted communication channel. Although human vision can easily reveal the secret message by stacking a sufficient number of shares, this scheme reduces the visual quality of recovered images. This paper presents a novel high-quality and printer-friendly VCS. When providing high-quality recovery, this scheme keeps the size of the shares the same as the secret image. Experimental results show that, compared with previous work, the proposed scheme significantly improves the performance of recovered images. 相似文献
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A new nested visual cryptography scheme is proposed for n cooperated user groups. It can encode the secret image consists of black and white pixels into share images which should be distributed to each user in each group. To decode the secret, users in at least k out of n groups should be present, and at least p out of q users should provide their shares for each attendant group (where p and q can be distinct for each group). For the proposed scheme, the known scheme can be regarded as a simple instance which has only one user in each group. Compared to S-extended visual cryptography scheme, there is no need to enumerate all the user sets which can decode the secret. 相似文献
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为了提高基于虚拟存储技术的嵌入式处理器的性能,本文提出了一种用于高效加速地址转换的TLB电路结构。该电路采用64-entries的全关联结构,硬件支持基于段及不同大小页的转换方式。通过VCS和Nanosim联合仿真对电路结构和性能进行了验证,仿真结果表明,系统中加入TLB电路以后性能有显著的提高。 相似文献
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基于人眼视觉特性与自适应PCNN的医学图像融合算法 总被引:1,自引:1,他引:1
针对多尺度变换的图像特征,提出了一种基于人眼 视觉特性与自适应脉冲耦合神经网络(PCNN)的医学图像融合新方法。首先,对经配准的源图 像进行非下采样Contourlet变换(NSCT), 得到低频、高频子带系数;然后,考虑到低频子带系数中保留了绝大部分源图像能量和图像 轮廓特征,提出 区域能量(RE)和梯度奇异值度量(GSVM)相结合的方法;考虑到图像全局特 征,将PCNN用于高频子带系数中,提出区域视觉对比度(SLVC )模拟人眼视觉特性作为PCNN的 外部刺激输入,设定PCNN的链接强度随视觉对比敏感度(VCS) 自适应变化,同时考虑到PCNN的迭 代次数,利用Sigmoid函数计算其点火输出幅值的显著性度量;最后,对获得的融合系数进 行逆NSCT得到融合图像。通过实验对比分析表明,本文算法不仅可以保留源图像信息的同时 ,还得到较好的客观评价指标和视觉效果。 相似文献
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本文首先介绍了SOC软硬件协同验证方法及其平台SeamlessCVE的工作原理和流程,进而在此基础上搭建一个高效的USBA-device验证平台,以实现USB高速A-device软硬件的并行设计,并详细介绍了USBA-device的工作原理和验证流程。 相似文献
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简要介绍了志愿计算(volunteercomput-ing)、志愿计算系统、节点、分组和节点管理等基本概念,在对传统的基于C/S模式的志愿计算系统分析的基础上,对基于P2P志愿计算系统(vcs)的SCAMP节点管理协议进行了详细阐述。 相似文献
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