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多视角彩色图像的十六元数分数阶切比雪夫-傅里叶矩 被引量:1
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作者 王春鹏 张清华 +3 位作者 马宾 夏之秋 李健 李琦 《计算机学报》 EI CAS CSCD 北大核心 2023年第2期400-421,共22页
图像矩具有强大的几何不变性和全局特征描述能力,是出色的图像特征.近年来,对于图像矩的研究取得了丰硕的成果.然而传统的图像矩存在诸多问题,部分图像矩的径向基函数数值不稳定,严重影响其图像重构性能.另外,传统的图像矩仅能用来处理... 图像矩具有强大的几何不变性和全局特征描述能力,是出色的图像特征.近年来,对于图像矩的研究取得了丰硕的成果.然而传统的图像矩存在诸多问题,部分图像矩的径向基函数数值不稳定,严重影响其图像重构性能.另外,传统的图像矩仅能用来处理灰度图像,对于当下广泛应用和传播的彩色图像却无能为力.灰度化和子通道处理彩色图像虽然在一定程度上可以让传统的图像矩在处理彩色图像上发挥作用,但是却破坏了彩色图像的整体性.分数阶矩和超复数矩的引入,让图像矩的研究进入了新阶段.但是,目前对于分数阶矩的研究依然不够全面,一些具有良好性质的传统图像矩的分数阶构造仍未有研究成果.对于超复数矩的挖掘依然不够充分,更高维度的超复数与图像矩结合可以让图像矩适应更为复杂的应用场景.本文依据切比雪夫-傅里叶矩(Chebyshev-Fourier Moments,CHFMs)构造分数阶切比雪夫-傅里叶矩(Fractional-order Chebyshev-Fourier Moments,FrCHFMs),有效地解决了CHFMs径向基函数存在的数值不稳定性问题.以此为基础,并结合十六元数理论,构造出十六元数分数阶切比雪夫-傅里叶矩(Sedenion Fractional-order Chebyshev-Fourier Moments,SFrCHFMs),将超复数矩的应用领域从彩色图像和立体图像拓宽到多视角彩色图像.多视角彩色图像是单部相机通过移动或者多部相机按视差要求布置在一定位置构成相机阵列所拍摄的图像.利用十六元数的虚部可以同时处理多视角彩色图像的所有视角的所有颜色分量,同时保证各分量之间的关联.通过图像重构实验验证了SFrCHFMs对于经过各种攻击的多视角彩色图像具有良好的重构性能.通过零水印实验验证了基于SFrCHFMs的零水印方案在面对各种攻击时要优于以往的立体图像零水印方案,进一步验证了SFrCHFMs的稳定性.实验结果表明,本文所提出的SFrCHFMs具有良好的图像重构性能和稳定性. 展开更多
关键词 十六元数矩 分数阶矩 切比雪夫-傅里叶矩 多视角彩色图像 图像重构
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基于残差学习的新型不可感知水印攻击方法
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作者 李琦 王春鹏 +4 位作者 王晓雨 李健 夏之秋 高锁 马宾 《软件学报》 EI CSCD 北大核心 2023年第9期4351-4361,共11页
传统的水印攻击方法虽然能够干扰水印信息的正确提取,但同时会对含水印图像的视觉质量造成较大损失,为此提出了一种基于残差学习的新型不可感知水印攻击方法.首先,通过构建基于卷积神经网络的水印攻击模型,在含水印图像和无水印图像之... 传统的水印攻击方法虽然能够干扰水印信息的正确提取,但同时会对含水印图像的视觉质量造成较大损失,为此提出了一种基于残差学习的新型不可感知水印攻击方法.首先,通过构建基于卷积神经网络的水印攻击模型,在含水印图像和无水印图像之间进行端到端非线性学习,完成含水印图像映射到无水印图像的任务,达到水印攻击的目的;其次,根据水印信息的嵌入区域选择合适数目的特征提取块以提取含水印信息的特征图.鉴于含水印图像和无水印图像之间的差异过小,水印攻击模型在训练过程中的可学习性受到限制,导致模型很难收敛.引入残差学习机制来提升水印攻击模型的收敛速度和学习能力,通过减少残差图像(含水印图像和提取的特征图像做差)与无水印图像之间的差异来提升被攻击图像的不可感知性.此外,还根据DIV2K2017超分辨率数据集以及所攻击的基于四元数指数矩的鲁棒彩色图像水印算法构建了训练水印攻击模型的数据集.实验结果表明该水印攻击模型能够在不破坏含水印图像视觉质量的前提下以高误码率实现对鲁棒水印算法的攻击. 展开更多
关键词 残差学习 不可感知 卷积神经网络 水印攻击模型 鲁棒水印算法
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Application of Hopfield Neural Networks Approach in Solar Energy Product Conceptual Design 被引量:2
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作者 xia zhi-qiu WANG Ling +3 位作者 REN Na WEI xiao-peng ZHANG Qiang ZHAO Ting-ting 《Computer Aided Drafting,Design and Manufacturing》 2013年第2期48-52,共5页
A new product conceptual design approach is put forward based on Hopfield neural networks models. By research on the mechanisms of Hopfield neural networks, the associative simulation approaches are proposed. The appr... A new product conceptual design approach is put forward based on Hopfield neural networks models. By research on the mechanisms of Hopfield neural networks, the associative simulation approaches are proposed. The approach is given by Hebb learn- ing law, Hopfield neural networks and crossover and mutation. The calculating models and the calculating formulas for the concep- tual design are put forward. Finally, an example for the conceptual design of a solar energy lamp is given. The better results are ob- tained in the conceptual design. 展开更多
关键词 Hopfield neural networks conceptual design solar energy
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Three Dimensional Simulation Method in Early Process of Division and Growth for Tumour Cells 被引量:1
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作者 xia zhi-qiu ZHAO Ting-ting 《Computer Aided Drafting,Design and Manufacturing》 2014年第3期75-83,共9页
The process of division, growth and death for tumour cell mass in the early is simulated. An integrated GUI is provided for users to set the value of each parameters, which are cell growth rates, cell mass division ra... The process of division, growth and death for tumour cell mass in the early is simulated. An integrated GUI is provided for users to set the value of each parameters, which are cell growth rates, cell mass division rates, cell mass death rates, simulate type, maximum running time, polarity and cell colour. It can display the growth process of each cell on result GUI. Also, it can display the values of each parameters for observing and analysing in current life cycle on result GUI, which are cell mass division times, cell mass death rate, cell mass division rate and cell mass growth rate. In the process of simulation, The cell growth rate is described by the approach to combine the exponential model with the linear model. In addition, a linked list data structure to store the tumour cells is used by the cellular automata for a reference to determine the position of each cell. It sets up two linked list to store the cells, one of them save the new small division cells and the other one save the big cell. That can make the painting process of cells on result GUI clearer and more organized. At last, the polarity oftumour growth is described for determining the growth direction of cells. 展开更多
关键词 TUMOUR SIMULATION cell growth cell division
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Graphics Innovation Design Based on Cell Intuition Simulation Method
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作者 xia zhi-qiu REN Na +1 位作者 ZHAO Ting-ting CUI Lunfeng 《Computer Aided Drafting,Design and Manufacturing》 2014年第1期27-31,共5页
This paper proposes a new cell intuition simulation method which is a combination of intuitive simulation calculation method and the operation of binary image, and applied it in the innovation of the graphic design pr... This paper proposes a new cell intuition simulation method which is a combination of intuitive simulation calculation method and the operation of binary image, and applied it in the innovation of the graphic design process. First of all, we study how to express a variety of graphics, and establish the definition of cell intuitive model, work out the cell intuitive operation process and many new cellular operators such as a variety of matrix blocks crossover operator, a variety of matrix blocks mutation operator, matrix blocks replace operator, matrix blocks compression operator, matrix blocks extension operator. By choosing two or more cells and selecting the artificial selection or fitness selection, we can set up and visualize the design and pick the best design results .Finally, validation is made on this algorithm by an example, and a innovation graphic is also represented. 展开更多
关键词 intuitive simulation creation design cell graphics
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