专业英语-image and televisions

One loss-less technique is known as run length encoding. 有一种非损失性压缩技术称为行程编码。 The compression algorithm processes each line of input imagery looking for regions in which data values are the same. 该压缩算法对每一行输入图像进行处理以找出 数据值一致的范围。
Compression rates may be generated by determining the size of the compressed image in terms of number of bits per image pixel for the original image. 决定压缩图像尺寸的压缩比可以通过原始图像 各像素所需压缩的比特数来确定。 Here we only considers compression of single high resolution multi-spectral images. 在此，先只考虑单个高分辨率多谱图像的压缩。

There are two general types of compression: (1)loss-less, and (2) loss. Loss-less compression means that you can achieve a certain compression factor and be able to exactly reproduce the original image. 通常有两种压缩方法：非损失性压缩和损失性 压缩。非损失性压缩意味着能产生某个压缩系 数并可以完全复现原始图像。 Loss compression on the other hand allows some loss, but has the potential for much higher compression rates. 损失性图像压缩则允许某些图像信息丢失，但 在压缩比上有着更大的潜力。
Length of time an image stays on the screen after the electrical signal is removed Persistence Front end of a TV receiver that selects desired station Tuner Extremely high-Q filters often used in TV and radar applications Surface acoustic wave filters High-Q band stop circuit that attenuates a narrow band of frequencies Wavetrap Trap Another name for wavetrap Black-and-white TV Monochrome
The principal evaluation criteria for the analysis of compressed versus uncompressed imagery is whether a person can tell the difference between the images. 评价压缩图像和未压缩图像的主要标准是人们 是否能区分它们。 A more implemental measure is the Root Mean Square (RMS) error between the original image and the image that has been compressed. 更有效的度量方法则是原始图像与压缩图像之 间的均方根差。
Object recognition 目标识别 Magnitude spectrum 幅度谱 Phase spectrum 相位谱 CT Computed tomography 计算机层析 MRI Magnetic resonance imaging 核磁共振成像 Run length encoding 行程编码 Huffman encoding 哈夫曼编码 DCT Discrete cosine transform 离散余弦变换
Higher compression rates will be achieved in a motion sequence where frame to frame variations may be quantified and only the changes from a reference image need be coded. 更高的压缩比可从运动序列的一帧到另 一帧的变化量化获得，并且只对参考图 像的变化部分进行编码。
Rows and columns 图像的行和列 Gray scale image 灰度图像 Gray scale level 灰度级 Image contrast 图像对比度 Bar graph 条形图 Histogram equalization 直方图均衡 Resultant matrix 结果矩阵 Edge detection 边缘检测
Specialized English on Telecommunication
Yang XiaoQing
Unit 17 Images and Televisions
Key terms Picture element; the smallest resolved area in a video scanning technique Pixel Shade 颜色深浅，渐变 Histogram 直方图 Reassign 再分配 A portion of a TV signal, transmitted by frequency modulation Aural signal a portion of a TV signal, which is amplitude modulated onto a carrier Video signal
Filter in a TV transmitter that allows both the video AM signal and audio FM signal to feed the same antenna Diplexer 天线公用器 A light-sensitive chip used to convert optical images to an electronic form CCD Charge couple device The time it takes an electron beam to move from the end of one line to the start of the next time Retrace interval (回程间隔) In a TV picture, the ratio of frame width distance to frame height distance Aspect ratio
No matter what technique that you use, the exact rate is very dependent on the complexity of the image that you are analyzing. 无论你采用什么技术，准确的压缩率室依靠于 你所分析的图像的复杂程度的。 For example, the normal best that can be achieved with loss-less encoding in a rate of 2 bits per pixel. 例如，通常非损失性编码能产生最好的效果是 各像素2位的压缩比。
a numerical measure of the uncertainty of an outcome Entropy Correlation 相关性 a grouping of a number of similar things Cluster Asymmetric 不对称的 Code book 码本 Fractal 分形 High definition television 高清晰度电视 RMS Root mean square 均方根 GIS Ground instrument system 地面测量系统 Vector quantization 矢量量化
In fact, for some land-sat scenes with urban areas and many small farms, the factor of 2 bits per pixel may not be able to achieved. 实际上，对于很多农场的乡村卫星图像，用各 像素2位的系数就不能够实现。 The same technique applied to a land-sat image of the mid-west where large fields occur and few shadows exist in images might produce a much better compression. 但对于大片开阔地和少数阴影的中西部地区的 卫星图像，同样的技术能产生较好的压缩。
The development of high definition television is further focusing the attention of industry and university scientists toward problems of data reduction and digital transmission. 高清晰度的电视的发展正进一步吸引工 业界和研究人员致力于数据压缩和数字 传播的研究。
Time-lapsed 时间上相继的 the branch of pure mathematics dealing with the theory of numerical calculations Arithmetic bend out of shape Warping 扭曲，变形 a computer method that is used to make one image gradually change into a different one Morph 变体,变种 the act of expanding an aperture Dilation Erosion 腐蚀 make unclear Blur Kernel 核心，要点 the size of something as given by the distance around it Perimeter 周长