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It has been proved that errors caused by ray-beam hardening can be eliminated by using image subtraction method. 实践表明，采用图象减法技术则有助于消除光束硬化现象造成的误差。
Method:Adopting IR subtraction method and comparing the location of absorption peaks. 方法:采用红外差谱技术,比较吸收峰位置,无需分离提取。
An adaptive background subtraction method is utilized to segment the moving regions and locate the positions of human bodies. 由自适应动态背景减除算法进行区域分割,确定人体的位置。
"Single peak" of absorbance subtraction method in infrared spectrometry was used to determine mixtures in visible and ultraviolet spectra. 将红外光谱分析中“独立峰”差谱法应用于可见光区混合物谱峰的分离和测定。
Method:Adopting IR subtraction method and comparing the location of absorption peaks.There would be no meed of separation and abstraction. 方法:采用红外差谱技术,比较吸收峰位置,无需分离提取。
Method invokes the add or subtract method of the counter service with a supplied value using request parameters that are submitted via a form. 方法使用通过表单提交的请求参数,调用具有提供值的计数器服务的加减方法。
With the illumination information processing as former procedure，this algorithm combined the merits of background subtraction method and symmetrical differencing method. 该算法结合了帧间差分与背景模型算法的优点，同时引入亮度信息进行前序的处理；
The factor effect on CIE coordinates error is analyzed, system error caused by standard source transfer is argued and the background signal subtraction method is brought forward. 对影响色坐标的各项因素进行了误差分析,分析了标准传递带来的系统误差和基线扣除方法,分析了随机噪声带来的重复性误差。
The factor effect on CIE coordinates error is analyzed, system error caused by standard source transfer is argued and the background signal subtraction method is brought forward. The repeatability error caused by random noise is also analyzed. 对影响色坐标的各项因素进行了误差分析,分析了标准传递带来的系统误差和基线扣除方法,分析了随机噪声带来的重复性误差。
In this paper, a new spectral subtraction method is presented, which breaks the assumption that the noise is Gaussian distribution with mean 0 in the original spectral subtraction method. 本文针对谱减法中关于噪声是零均值的高斯分布的假设,提出了一种可以打破这一假设的改进谱减算法。
He professed to know nothing about the matter. 他声称对此事一无所知。
the limited strength fold subtraction method 有限元强度折减法
When it comes to German, I know nothing. 谈到德语，我一窍不通。
Dissimilar subtraction method of soil fertility 地力差减法
Nothing is known of the authorship of the book. 无人知道该书是何人所写。
He was known to be a young man with lofty ideals. 人们都知道他是一个有抱负的青年。
I take it you know what a stethoscope is. 我想你知道听诊器是个什么东西。
The place is known for its handicraft products. 这地方因出手工艺品而出名。
I know where the picturesque old-world village is. 我知道那个风景如画的古老村寨在哪儿。
But the subtractive method, while requiring complex chemical techniques, has turned out to be more practical and is the basis of all modern color films. 但减色法尽管需要复杂的化学技术，最终比前者更加实用，并成为现代彩色电影的基础。