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相关概念视频

BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

353
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
353

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相关实验视频

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Automated Analysis of Dynamic Ca2+ Signals in Image Sequences
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一个基于混乱映射的适应性强大的水标方案.

Yumin Dong1, Rui Yan2, Chenhao Yin2

  • 1College of Computer and Information Science, Chongqing Normal University, Chongqing, 401331, China. dym@cqnu.edu.cn.

Scientific reports
|October 21, 2024
PubMed
概括

这项研究引入了一种新的高容量彩色图像水印方案,使用离散波量变换 (DWT),海森堡分解 (HD) 和奇数值分解 (SVD). 该方法增强了安全性和稳定性,同时保持了数字图像信息保护的高无感知度.

科学领域:

  • 信息安全 信息安全
  • 数字图像处理 数字图像处理
  • 密码学 密码学 密码学 密码学

背景情况:

  • 数字图像传输面临着越来越多的安全风险.
  • 图像水印对于保护图像信息安全至关重要.
  • 在图像水印中,平衡不可察觉性,强度和嵌入能力是关键挑战.

研究的目的:

  • 提出一个高容量的彩色图像自适应式水印方案.
  • 为了提高数字图像水印的安全性,不可察觉性和稳定性.
  • 为了提高嵌入能力和减少处理时间.

主要方法:

  • 使用了离散波纹变换 (DWT),海森伯格分解 (HD) 和奇点值分解 (SVD).
  • 用于水标加密的物流混乱映射.
  • 通过封面图像和YCbCr颜色空间中的Alpha混合进行自适应嵌入因子计算.
  • 整合了为增强强性而进行的单一价值校正.

主要成果:

  • 实现了高不可感知度,平均PSNR为45.3437dB,SSIM为0.9987.
  • 在各种攻击中表现出强大的稳定性,平均NCC高于0.95.
  • 达到了0.6667bpp的高嵌入容量,平均运行时间为1.1136秒.

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结论:

  • 拟议的水印方案有效地平衡了不可察觉性,强度和高嵌入能力.
  • 在容量和速度方面,与现有的水印技术相比,提供更高的性能.
  • 为数字图像信息保护提供安全有效的解决方案.