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noise ratio
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    Experimental results show that the proposed algorithm outperforms AT-3DSPIHT (asymmetric transform 3D set partitioning in hierarchical trees) and 3DSPECK by 0.4 dB and 1.4dB on the average PSNR (peak signal to noise ratio) respectively. Compared with popular zerotree approaches, AT-3DSPECK is faster in coding speed.
    实验测试表明:AT-3DSPECK算法的平均PSNR(peak signal to noise ratio)分别比AT-3DSPIHT(asymmetric transform 3D set partitioning in hierarchical trees)和3DSPECK算法高0.4dB和1.4dB.此外,AT-3DSPECK还具有比零树算法更快的编码速度.
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    Adaptive removal of salt-pepper noises through fast noise ratio estimation
    噪声概率快速估计的自适应椒盐噪声消除算法
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    Then the values of NAA/Cr, Cho/Cr, mI/Cr, and SNR (signal noise ratio) were recorded and analyzed.
    记录NAA/Cr,Cho/Cr,mI/Cr和SNR值,并进行统计学分析。
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    Improving signal to noise ratio of seismic profiles using an image processing technique
    图像数字去噪处理方法研究及其应用(英文)
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    The comparison results show that, although EZW algorithm has many advantages such as high compression rate、 good video quality、 high PSNR(Peak Signal to Noise Ratio), it has many disadvantages such as occupying too much system resources、 very great computation quantuty、 high complexity etc.
    比较结果显示,零树小波编解码算法具有高压缩比、高质量的复原图像、高信噪比等特点,同时也暴露了其占用系统资源过大、运算量非常大、复杂度高等缺点。
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  noise ratio
Fast identification of digital amplitude modulation level at low signal-to-noise ratio
      
Simulation results reveal that the AR scheme with its decision algorithm outperforms the conventional and other modified TR schemes in generalized signal-to-noise ratio (SNR).
      
The SNR (signal-to-noise ratio) of the vibration signals of a diesel cylinder lid is the highest.
      
Identification of Discrete Linear Objects with a Large Signal-to-Noise Ratio
      
Methods for the conversion of image silver nanoparticles into luminescent products were developed; this considerably increased the signal-to-noise ratio of luminescence reading.
      
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The basic principle of hybid processing for optical—digital x—ray tomography, the recording system, and the method of data processing are discribed, followed by experiment resuits of two dimension image reconstruction from a set of x ray tomograph. The properties of x ray film used for the recording sineshaped figures in the image are analysed in detail. A new method of correcting sine shaped images is proposed. The paper a so compares the quaities of corre ted sine-shaped figures with the oringinal one. The...

The basic principle of hybid processing for optical—digital x—ray tomography, the recording system, and the method of data processing are discribed, followed by experiment resuits of two dimension image reconstruction from a set of x ray tomograph. The properties of x ray film used for the recording sineshaped figures in the image are analysed in detail. A new method of correcting sine shaped images is proposed. The paper a so compares the quaities of corre ted sine-shaped figures with the oringinal one. The effe t of the film granularity on the noise of reconstructed mage are discussed. A new formula of the signal to-noise ratio is derived.

本文介绍了光学/数字混合处理X光层析的基本原理、系统组成以及数据处理方法。给出了这种方法重建物体横断面吸收系数的二维图象的结果。文中对记录胶片的特性作了较详细地分析,提出了修正正弦图数据的方法,并比较了用修正正弦图数据和直接用正弦图数据重建图象的质量。讨论了胶片的颗粒噪声对重建象的影响,并推导出重建图象的信噪比公式。

This paper presents a computer analysis system for particles in micro-scopic images.Cares has been taken in the designing of the system in orderto take into full account of poor qualities of microscopic images,such as lowcontrast,non-uniformity of illumination,low signal-to-noise ratio,etc..Spe-cial algorithms developed to deal with holes witnin particles and overlappedparticles.The system can be used for analyzing microscopic images of dif-ferent magnification factors and for analyzing images obtained...

This paper presents a computer analysis system for particles in micro-scopic images.Cares has been taken in the designing of the system in orderto take into full account of poor qualities of microscopic images,such as lowcontrast,non-uniformity of illumination,low signal-to-noise ratio,etc..Spe-cial algorithms developed to deal with holes witnin particles and overlappedparticles.The system can be used for analyzing microscopic images of dif-ferent magnification factors and for analyzing images obtained by means otherthan microscopy.The contents of analysis results includes particle area,longaxis,short axis,ratio of long axis and short axis.These results are qiven inthe forms of mean,deviation and distribution curves.

本文权述了一个人机交互式的显微图象计算机粒度分析系统.该系统软件的设计充分考虑了显微图象对比度差、照度不均匀、信噪比小等特点,并且设计了专门的算法以处理颗粒图象中的空洞以及相互重叠的问题。该系统可以用于分析不同放大倍数和不同物质的显微图象或用其它手段所获得的图象.分析结果以分布曲线和数字的形式输出.内容可包括:颗粒面积、长轴、短轴、长短轴之比的统计分布以及上述各项分布的期望值和方差.

This paper discusses a new approach of feature extraction used by SODAMS, the precision of least squares matching based on features, the signal-to-noise ratio of features and some thresholds used in feature detection. The analysis shows how precision depends on the gradient of the feature and on the direction of the edge line. The optimal precision of least squares matching based on features can be tess than 1μm.

本文对SODAMS中采用的新的特征提取方法和基于特征的最小二乘匹配的精度以及特征的信噪比、特征检测的若干阈值、特征的倾斜度与精度的关系、特征线方向与精度的关系等问题,进行了分析与讨论。分析表明,在比较理想的情况下,基于特征的最小二乘匹配的精度可达1μm以下。

 
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