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一种新的Retinex-LLAS图像增强方法
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作者 曹格妮 高星 《江西科学》 2015年第2期259-262,共4页
频率域阈值泊松方程Retinex增强方法,提供了一种高效快速的图像增强方法,改善了人类视觉系统对图像的感知,但同时得到增强的图像噪声会形成马赛克效果。根据Retinex图像增强存在的不足,引入基于图像几何结构演化的LLAS(Level Lines Affi... 频率域阈值泊松方程Retinex增强方法,提供了一种高效快速的图像增强方法,改善了人类视觉系统对图像的感知,但同时得到增强的图像噪声会形成马赛克效果。根据Retinex图像增强存在的不足,引入基于图像几何结构演化的LLAS(Level Lines Affine Shortening)方法,先将图像灰度水平几何分解,图像由栅格像素转变为矢量特征点,在此基础上进行非线性几何演化处理,对演化结果离散化后重构图像。实验结果和统计数据显示,改进方法在保持边缘结构信息的同时消除马赛克噪声的影响,新方法改善了Retinex增强结果。 展开更多
关键词 RETINEX 阈值泊松方程 水平线 LLAS pde演变
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On biological population model of fractional order 被引量:1
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作者 Syed Tauseef Mohyud-Din Ayyaz Ali Bandar Bin-Mohsin 《International Journal of Biomathematics》 2016年第5期107-119,共13页
In this paper, we extensively studied a mathematical model of biology. It helps us to understand the dynamical procedure of population changes in biological population model and provides valuable predictions. In this ... In this paper, we extensively studied a mathematical model of biology. It helps us to understand the dynamical procedure of population changes in biological population model and provides valuable predictions. In this model, we establish a variety of exact solutions. To study the exact solutions, we used a fractional complex transform to convert the particular partial differential equation of fractional order into corresponding partial differential equation and modified exp-function method is implemented to investigate the nonlinear equation. Graphical demonstrations along with the numerical data reinforce the efficacy of the used procedure. The specified idea is very effective, unfailing, well-organized and pragmatic for fractional PDEs and could be protracted to further physical happenings. 展开更多
关键词 Modified exp-function method biological population model fractional calculus Caputo's fractional derivative.
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