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在实际问题中测得的实验数据有时需寻求简单函数逼近来分析,曲线拟合的最小二乘法在解决这类问题的数据处理和误差分析中应用非常广泛。为了便于说明这种方法的应用,根据最小二乘法原理,采用曲线拟合方法,运用Matlab仿真工具对三角函数实际特性曲线进行拟合,在分别采用3、5、7、9次多项式进行拟合实验的基础上,分析拟合实验效果,通过比较得出正弦函数特性曲线采用5次多项式拟合效果最佳,避免了人工处理数据的随意性,减小了误差。 相似文献
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正弦曲线拟合若干问题探讨 总被引:3,自引:0,他引:3
研究了测量噪声较小情况下正弦曲线的最小二乘多项式拟合误差与拟合阶数的关系,分别采用均方误差和误差平方和分析了测量噪声以及测量数据有效位数对拟合误差的影响,对多周期正弦曲线拟合以及正弦曲线的外推存在的问题进行了探讨,指出了正弦曲线的最小二乘多项式拟合方法的局限性.最后,提出了一种基于傅利叶变换的频率已知正弦曲线拟合方法,仿真结果表明其性能优于最小二乘多项式拟合方法. 相似文献
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为使B样条拟合目标曲线的迭代过程中单独控制部分数据点,调整局部曲线形状,减小局部曲线迭代误差,提出带互异权值的最小二乘渐进迭代逼近法.首先赋统一初始权值于每个数据点,用最小二乘渐进迭代逼近法生成B样条拟合曲线;其次调整部分数据点对应的权值,运用带互异权值的最小二乘渐进迭代逼近法生成B样条拟合曲线;最后比较调整前后拟合误差.实例结果表明,本文所提出方法可调整局部拟合曲线形状,减小拟合误差. 相似文献
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详细介绍了基于同一场景不同曝光量图像序列的高动态范围图像合成过程;针对现有拟合的相机响应曲线随采样点的变化曲线变化大、不稳定等特点,提出一种新的相机响应曲线算法.该算法先根据图像序列成像特点对图像序列去噪;采用最小二乘法拟合出图像序列像素值关系曲线;利用该曲线再一次采用最小二乘法拟合得到相机响应曲线.实验结果表明,该技术拟合出的相机响应曲线比较平滑,能合成出高质量的高动态范围图像. 相似文献
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The complexity of the error correction circuitry forces us to design quantum error correction codes capable of correcting
a single error per error correction cycle. Yet, time-correlated error are common for physical implementations of quantum systems;
an error corrected during the previous cycle may reoccur later due to physical processes specific for each physical implementation
of the qubits. In this paper, we study quantum error correction for a restricted class of time-correlated errors in a spin-boson
model. The algorithm we propose allows the correction of two errors per error correction cycle, provided that one of them
is time-correlated. The algorithm can be applied to any stabilizer code when the two logical qubits and are entangled states of 2
n
basis states in .
相似文献
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本文针对t-EC/d-UED码[7]中介绍的纠t个错和检d个单向错(t-EC/d-UED)码提出了一种改进方法,改进后的码在大多数情况下具有更强的检错能力。 相似文献
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In the past, C
systems have been studied with little consideration of the social context in which they will be used (see Ref. [1]). A framework of social context has been proposed [1] that takes the social aspects of a collaborating community to be a vital consideration in the design of C
systems. This paper aims to extend Mantovani's framework to deal with the issues of human error. The social context plays a large part in the cause, detection, level of consequence and recovery of erroneous actions in C
. This paper considers how current classification of human errors might be adapted for application in C
. A framework has been proposed which can be used in the analysis of the social context of C
. 相似文献
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运用BP和RBF神经网络方法和Matlab6.5工具软件建立了小样本数据条件下的固体火箭发动机比冲的神经网络预测模型,并将两种神经网络预报的效果进行了比较。两种网络较好的预报效果,表明建立的预测模型是合理的。在此基础上,提出了与之相应的预报误差控制方法及其新型号发动机比冲预测的选模判据。数值实验结果表明,所提供的网络模型可在小样本数据条件下实现发动机比冲性能的高精度预测。 相似文献
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John Oliensis 《International Journal of Computer Vision》2005,61(3):259-299
We analyze the least-squares error for structure from motion with a single infinitesimal motion (structure from optical flo). We present asymptotic approximations to the noiseless error over two, complementary regions of motion estimates: roughly forward and non-forward translations. Our approximations are powerful tools for understanding the error. Experiments show that they capture its detailed behavior over the entire range of motions. We illustrate the use of our approximations by deriving new properties of the least-squares error. We generalize the earlier results of Jepson/Heeger/Maybank on the bas-relief ambiguity and of Oliensis on the reflected minimum. We explain the error's complexity and its multiple local minima for roughly forward translation estimates (epipoles within the field of view) and identify the factors that make this complexity likely. For planar scenes, we clarify the effects of the two-fold ambiguity, show the existence of a new, double bas-relief ambiguity, and analyze the error's local minima. For nonplanar scenes, we derive simplified error approximations for reasonable assumptions on the image and scene. For example, we show that the error tends to have a simpler form when many points are tracked. We show experimentally that our analysis for zero image noise gives a good model of the error for large noise. We show theoretically and experimentally that the error for projective structure from motion is simpler but flatter than the error for calibrated images. 相似文献
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D.J. Blacker 《Computers & Mathematics with Applications》2004,48(12):1863-1876
The subject of a posteriori error estimation is widely studied, and a variety of such error estimates have been used for elasticity problems in recent years. Of particular interest is the work carried out in 1. and 2.. In this paper, we derive a new a posteriori error estimator for the quadratic nonconforming Fortin-Soulie element for the error in an energy-like norm. Then, we illustrate the new error bound by presenting some numerical examples, and show an example of a sequence of adaptively refined meshes. 相似文献
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随着通信和计算机技术的发展,基于不可靠网络的视频图象的通信受到了越来越广泛的应用。因此,视频传输中的差错控制技术和差错掩盖技术也显得越来越重要。本文提出了一种精确的差错恢复方案.即将精确差错跟踪和差错掩盖技术相结合的方案,不仅通过帧内编码刷新技术终止了差错的继续传播,而且利用图象和视频特性,在解码器端采
采用差错掩盖技术恢复受损图象。通过在H.263编解系统中的实验表明.这种方法对改善出现差错的视频信号非常有效. 相似文献
采用差错掩盖技术恢复受损图象。通过在H.263编解系统中的实验表明.这种方法对改善出现差错的视频信号非常有效. 相似文献
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为了实现高效的五轴加工,本文对五轴RTCP技术进行深入研究,通过对旋转角度的细分及插补点处非线性误差补偿,减小了加工中的非线性误差并满足补偿算法的实时性,通过对各轴速度进行约束的前瞻算法、减小了加工过程中的机床振动,从而提高了工件表面的加工质量.本文提出采用基于参数配置的运动学模型,提高了工件程序的可移植性.最后将该算法添加到GJ-310数控系统中,并进行了试验验证,结果表明该算法可以满足加工要求. 相似文献