变换

Then every curve is fitted by an ideal ellipse.

基于Hough变换的算法是检测这些形状的常用算法，Hough变换是将几何图形转化为带多个自由参数的曲线，它是定义在图像空间和参数空间上的一个映射。

Owing to its small volume, light weight, high efficiency, succinct circuitry, high reliability and great capability of self-equalizing output loads in different circuitries, the Fly-back Converter becomes the optimally topological form of designing auxiliary power supply of high frequency switching power and driving power supply of power switching.

由于反激式变换器不但具有体积小、重量轻、效率高、线路简洁、可靠性高等优点，而且还具有较强的自动均衡各路输出负载的能力，目前反激式变换器的电路拓扑形式已成为人们设计高频开关电源的辅助电源以及设计各种功率开关驱动电源的首选。

The output power of interleaved flyback converter is two times high than that of flyback converter.

交错反激变换器可将反激变换器的输出功率提高1倍。

Firstly, the summarize of the development and actuality of flyback converter is given, and different snubber circuits applied in the flyback converter are analyzed and compared.

首先，对反激变换器的发展与现状做了全面的概述，比较了反激变换器各种缓冲电路的优缺点。

Introduced formal notations of derivative which keep the properties of derivative and their operations are easily realized on computer,A mechanization proving principle of automatic reasoning of transformations between differential equations is built.

引进保持性质的导数的形式记号，建立了微分方程变量间依赖关系的自动推理的机械化证明原理，从而方程间的变换（如Backlund变换等）均可机械地验证。

The use of Fourier transform and analysis, as well as introduce the principle of Fourier transform.

详细说明：傅立叶变换的运用与分析，以及对傅立叶变换的原理介绍。

Detailed analysis and Fourier Transform on the principle and the fast Fourier transform analysis and method introduced.

详细分析和讲解傅立叶变换的原理和快速傅立叶变换的分析与实现方法介绍。

VC do image processing procedures, including tensile contrast, Fourier transform, discrete cosine transform, and so on Wiener filter.

用VC做的图象处理程序，包括对比度拉伸，傅立叶变换，离散余弦变换，维纳滤波等等。

These math operations involve not only the simple plus, minus, and multiplication operation but also the function of signal analysis such as Fast Fourier Transform and Discrete Cosine Transform.

这些数学运算从简单的加减法和乘法到复杂滤波以及信号分析功能如快速傅立叶变换和离散余弦变换都具有显著的优势。

Using the limit definition of Fourier transform, the paper has proved the universal form of Fourier transform differential and integral characteristic theorem, explained its application method, and pointed out that errors can be substantially reduced by using this method.

提要：本文采用Fourier变换的极限定义式，证明了普遍形式的Fourier变换微积特性定理。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。