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东南大学 信息科学与工程学院,江苏 南京,210096
收稿日期:2008-07-12,
修回日期:2008-08-15,
网络出版日期:2009-07-25,
纸质出版日期:2009-07-25
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张煜东, 吴乐南. 用改进的Paik型Boltzmann机实现图像复原[J]. 光学精密工程, 2009,17(7): 1737-1744
ZHANG Yu-dong, WU Le-nan. Realization of image restoration by improved Paik's Boltzmann machine[J]. Editorial Office of Optics and Precision Engineering, 2009,17(7): 1737-1744
为解决传统的Boltzmann机方法不仅容易陷入局部最小点
而且收敛速度慢问题
对传统的Boltzmann机进行了改进。将Paik's算法与Boltzmann机结合
使串行模式推广到并行模式以加快收敛速度;使用亚单位步长增进技术增加计算精度;最后
为折中收敛速度与收敛精度这一对矛盾
采用了自适应步长策略。对算法的改进进行了理论验证、收敛性分析并对残差变化进行了讨论。实验表明
该方法能够收敛到全局最优
复原结果的峰值信噪比比改进的Boltzmann机法获得的峰值信噪比高0.5~0.8 dB
且收敛速度仅为该方法的1/3
证明了本文提出的改进的Paik型Boltzmann机对图像复原是有效的。
An improved Paik's Boltzmann machine was presented to optimize the traditional Boltzmann method that suffers from not only being trapped into a local extreme but also a slow convergence. By proposed the method
the Paik's algorithm is integrated into the Boltzmann machine to restored images. Then
serial models are extended to parallel models to fasten the convergence speed and a subunit step is adopted to increase calculation precision. Finally a step adaptive method is used to trade off the contradiction of convergence precision and convergence velocity. Moreover
each improvement for the origonal algorithm is expatiated by theoritical validation
convergence analysis
and discussions of residual variations. Experiments demonstrate that the proposed method can be converged to the global minimum
and the Peak Signal Noise Ratio (PSNR) of the restored image is 0.5-0.8 dB higher than that of the improved Boltzmann method proposed by Bellouquid
while the consumed time is only 1/3 that of the latter. These results show that the proposed method is effective and valid for image restorations.
朱俊, 文玉梅, 李平. 一种像场弯曲的图像复原方法[J]. 光学 精密工程, 2003,11(6):621-626. ZHU J, WEN Y M, LI P. Restoration of field-curved images[J]. Opt. Precision Eng., 2003, 11(6): 621-626. (in Chinese)[2] 韩玉兵, 吴乐南. 基于状态连续变化的Hopfield神经网络的图像复原[J]. 信号处理, 2004,20(5):431-435. HAN Y B, WU L N. Image restoration using a modified hopfield neural network of continuous state change[J]. Signal Processing, 2004,20(5):431-435. (in Chinese)[3] 许廷发, 张敏, 顾海军. 改进的BP算法在多目标识别中的应用[J]. 光学 精密工程, 2003,11(5):513-515. XU T F, ZHANG M, GU H J. Multi-target recognition with improved BP Algorithm . Opt. Precision Eng., 2003,11(5):513-515. (in Chinese)[4] 李鸣鸣, 龚振邦, 欧阳航空, 等. 实验数据RBF神经网络模型中噪声的处理方法[J]. 光学 精密工程, 2005,13(1):227-231. LI M M, GONG ZH B, OUYANG H K, et al.. Strategies to the noise contained in experimental data in RBF neural network model[J]. Opt. Precision Eng., 2005,13(1):227-231. (in Chinese)[5] PAIK J M, GOODMAN J W. Neural networks for computation: number representation and programming complexity Appl[J]. Opt., 1986,25(18):3033-3046.[6] PAIK J K, KASAGGELOS A K. Image Restoration using a modified hopfield network[J]. IEEE Transactions on Image Processing, 1992,1(1):49-63.[7] BELLOUQUID A. From discrete Boltzmann equation to compressible linearized Eluer equations[J]. Electronic Journal of Differential Equations. 2004(104):1-18.[8] 汪源源, 孙志明, 蔡铮. 改进的奇异值分解法估计图像点扩散函数[J]. 光学 精密工程, 2006,14(3):520-525. WANG Y Y, SUN ZH M, CAI ZH. Estimation of PSF of image system using modified SVD method[J]. Opt. Precision Eng., 2006, 14(3): 520-525. (in Chinese)[9] ZHANG Y D, WU L N. Improved image filter based on SPCNN[J]. Science in China F edition: Information Science, 2008, 51(12): 2115-2125.[10] ZHANG Y D, WU L N. Multi-resolution rigid image registration using bacterial multiple colony chemotaxis . Visual Information Engineering,2008:528-532.[11] ZHANG Y D, WU L N. A novel pattern recognition method via PCNN and Tsallis entropy[J]. Sensor, 2008,8(11):7518-7529.
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