压缩比

这种压缩器的压缩比通常比归档XML压缩器的压缩比差。

The compression ratio of this group is usually worse than that of the archival XML compressors .

基于整数压缩比的SAR图像浮点数据压缩研究

SAR Float Image Data Compression based on an Integer Ratio

一种基于Fourier复变换的压缩比自调整ECG数据压缩算法

A CR-self-adjusting data compression algorithm based on complex fourier transform

双站聚束SAR的方位分辨特性和波束压缩比研究

Research on the Azimuth Resolution and Beam Compression Ratio of Bistatic Spotlight SAR

在此基础上设计了点火提前角控制器的软件和硬件，做了高压缩比的LPG发动机试验。

The hardware and software of ignition advanced angle controller are designed in this base .

有DCT补偿的分形编码中最优压缩比控制参数的选择

The Selection of Optimal Controls Parameter for Given Compression Ratio in Fractal Coding with DCT Complement

在压缩比大于8（8.15压缩比10.19）的工况下，采用双级压缩时理论制冷系数比单级提高了9.01%～10.85%，排气温度可降低33°C～44°C。

When the compression ratio is over 8 ( 8.15 compression ratio 10.19 ), theoretical COP of two-stage compression will increase 9.01 % ~ 10.85 % compared with single-stage compression .

提出一种高压缩比、高保真度的DCT（离散余弦变换）压缩ECG（心电图）数据的方法。

Method of ECG data compression via DCT was presented with high compression ratio ( CR ) and high fidelity .

压缩比相同时适当缩小燃烧室直径，有助于降低HC排放。

Reducing combustion chamber diameter was propitious to reduce HC emissions under the same compress ratio .

实验结果显示Hilbert扫描可以增加像素的相关性，对提高压缩比有一定的贡献。

The experiments show that Hilbert scanning can enhance pixel locality , and increase the compression ratio effectively .

对压缩比12的天然气发动机的ECU重新进行标定，得到万有特性曲线图。

A mapping characteristics chart was achieved through calibrating the ECU for the modified NG engine .

分析了进气温度、燃空当量比、压缩比、CO2对燃烧和排放的影响。

The influences of the intake charge tem perature 、 fuel air equivalence ratio 、 compression ratio 、 CO2 to combustion and pollution are studied .

结果与JPEG标准相比，本文的方法能够获得更好的图像质量和更高的压缩比；

Results Compared with JPEG , the method used in the paper could achieve better image quality and higher compression ratio .

位平面变换算法的理论运算复杂度为O（N）量级（N为图像中像素的个数），低于其它常用的图像变换；压缩比达到了1.9以上，与其它超光谱图像压缩算法相当。

The calculation complexity of compression algorithm based on bit plane transform is O ( N ), N is the number of pixels in the image . The compression ratio of algorithm is more than 1.9 .

结果表明：延后喷油正时和（或）减少压缩比可以实现柴油机的低温燃烧，从而降低柴油机的NOx排放率，但柴油机的油耗率和烟度将受到影响；

Experiment results make it clear achieving low temperature combustion and reducing NOx emission from the diesel engine by reducing injection timing or / and compression ratio , but increasing fuel com-sumption and smoke ;

该算法经实验验证，比传统的LZ算法具有更高的压缩比。

Experiments indicate that this algorithm has better compression rate compares with traditional LZ algorithm .

采用测试序列进行验证，结果证明本软件实现了MPEG-4视频图像的高压缩比和较满意的主观图像压缩质量。

The result of test sequence proves that the software has achieved high compression of MPEG-4 video image and satisfactory subjective image compression quality .

改进设计了LPG供气系统和原机点火系统，标定了LPG喷射器的流量特性，分析了不同压缩比、点火角对发动机性能和排放的影响规律。

The LPG supply system was designed and the ignition system was improved according to the requirements of LPG and the flow characteristic of the LPG injector was calibrated .

与原始的层式DCT相比，该算法在同样的压缩比，尤其是较低压缩比下可以获得更高的峰值信噪比。

An improved layer DCT coding algorithm is proposed , which can achieve better PSNR under the same condition of compression ratio compared with the traditional layer DCT coding algorithm .

直接表示的灰度矩形NAM图像可以通过全值存储、限制矩形大小存储以及Huffman编码存储来提高压缩比。

The direct represented gray scale NAM image can improve compression ratio by full value storage , limited rectangle storage and Huffman code storage .

这样，我们稀疏化低显著性的DCT子块，得到更高的压缩比而不改变高显著性DCT子块的压缩比。

In this way , we increase the sparseness of low salience DCT blocks , giving those blocks higher compression ratio while maintaining the compression ratio of high salience DCT blocks .

Fisher算法相比，在压缩比和解码图像质量几乎不变的情况下，并行算法的编码速度比Y.Fisher算法提高近4倍。

The speed of the parallel scheme is nearly 4 times faster than that of the scheme proposed by Fisher with almost the same compression ratio and reconstructed image quality .

为了既能获得较高的压缩比，又能保证较好的图象质量，提出了一种基于三维离散余弦变换（3DDCT）的静止彩色图象编码方法。

In this paper , A three dimensional discrete cosine transform ( 3D DCT ) coder for still color images is presented , which can not only achieve high compression ratio but also ensure good image quality .

但在高压缩比的情况下，解码图像往往会因DCT系数的量化而出现严重的块效应，影响着解码图像的视觉效果。

But it often causes heavy blocking artifacts near the block boundaries at high compression rate for the quantization of DCT coefficients , which could impact visual effect of the decoded image .

为了得到更高的压缩比，在第二代Bandelet变换的研究基础上，提出了一种与Bandelet变换相适应的图像编码方案。

This paper describes a new image coding strategy based on the second generation Bandelet transform .

分形图像编码以较高的压缩比、分辨率无关及解码过程与源图像无关等特性，受到越来越多的关注，它和小波变换、DCT变换一起被誉为第二代图像压缩方法。

Fractal image coding , for its high compression ratio , resolution independent , and the decoding process has nothing to do with the source image and other advantages , was concerned by more and more peoples .

实验结果表明，SPIHT改进算法与原来的SPIHT算法相比，在相同的压缩比下可以获得更高的峰值信噪比。

Experiments show that the improved SPIHT algorithm could provide higher PSNR value than the original SPIHT algorithm at the same compression rate .

MP3是MPEGAudioLayer-3的缩写，即MPEG第三层音频编码标准，使用MP3标准对音频数据编码既可以获得较大的音乐数据压缩比，又可以得到较好的音乐回放质量。

MP3 is short for MPEG Audio Layer-3 . We can obtain higher compression ratio of music data using MP3 technology , and at the same time we could receive good playback quality .

Fisher提出的自适应四叉树编码方法加快了图象编码的速度，提高了图象的压缩比，但是在图象的重建质量上还存在不足。

Self-adapted quadtree image compression method proposed by Fisher [ 13 ] in-creases the speed of encoding procedure of the image , heightens the compression ratio , but the quality of the reconstructed image is not good .

结果表明：采用非共沸环保混合制冷剂（R744/R717）-40℃低温冷柜自然复叠制冷系统在保持压缩比小于8的同时能获得COP值高达0.71，是一个有发展前途的制冷系统。

It is shown that the - 40 ℃ freezer using zeotropic refrigerant mixture of R744 / R717 has high COP of 0.71 while keeping the compressing ratio less than 8 . It is a promising refrigeration system .