图像压缩

In order to decrease space, speed transporation, an image must be compressed. There are two methods: revertible and unrevertible.

为了减少数据存储量，节约传送，处理时间，必须对图像数据进行压缩，这些方案可分为两类，即可逆型和不可逆型，对于掌纹图像，因为我们要掌纹图像的细节，如果用不可逆压缩方法，就会丢失掌纹细节信息，因此，我们只能用可逆型压缩方法。

Fourthly, it discusses the spectral image loss-less compression by applying thecorrelation and the entropy of the spectral image sequence. It gives and analyses three expressions of imaging spectrometer images, and tells the change in correlation coefficient and entropy for different expressions. At last, it puts forward D2PCM de-correlation method to reduce the spatial and spectral redundancy. This method improves the compression ratio and the compression efficiency, being easy and fast in operation.

根据成像光谱图像的空间、谱间相关性和信息熵的特征，提出成像光谱图像序列的三种表示方法，分析了不同表示方法的相关系数和图像信息熵的变化，并研究出了成像光谱图像的无损压缩方法，即利用D~2PCM方法对光谱图像序列进行去相关处理，同时降低图像的空间和谱间冗余，在提高了无损压缩的压缩比和压缩效率的同时，算法具有简单快速的优点。

Fourthly, it discusses the spectral image loss-less compression by applying thecorrelation and the entropy of the spectral image sequence. It gives and analyses three expressions of imaging spectrometer images, and tells the change in correlation coefficient and entropy for different expressions. At last, it puts forward D2PCM de-correlation method to reduce the spatial and spectral redundancy.

根据成像光谱图像的空间、谱间相关性和信息熵的特征，提出成像光谱图像序列的三种表示方法，分析了不同表示方法的相关系数和图像信息熵的变化，并研究出了成像光谱图像的无损压缩方法，即利用D~2PCM方法对光谱图像序列进行去相关处理，同时降低图像的空间和谱间冗余，在提高了无损压缩的压缩比和压缩效率的同时，算法具有简单快速的优点。

In this case, the image is generated through a video digitizer and compressed before transmission. Methods such as JPEG or MPEG, described in Chapter 6, are used to downsize the image. The reduction of image size depends on the compression method and compression rate.

这种方法在传输前先对数字图像进行压缩，一般使用的压缩方法有JPEG和MPEG，压缩后图像的大小取决于选用的压缩方法和压缩时选择的参数。

A new generation of geostationary JPEG2000 image compression standard of discrete wavelet transform as its core technology transformation.

新一代静止图像压缩标准JPEG2000将离散小波变换作为其核心变换技术。

A new generation of geostationary JPEG2000 image compression standard of discrete wavel...

新一代静止图像压缩标准JPEG2000将离散小波变换作为其核心变换技术。

New generation of geostationary JPEG2000 image compression algorithm reference code using C ++, very easy to unders...

新一代静止图像压缩算法JPEG2000的参考代码，采用C＋＋实现，非常易懂，是学习JPEG2000编程应用的好东东。

A new generation of geostationary JPEG2000 image compression standard of discrete wavelet transform as its core technology transformation.

详细说明：用VC写的一个小波正反变换。新一代静止图像压缩标准JPEG2000将离散小波变换作为其核心变换技术。

Image compression algorithm based on the DWT has carried on the realization in the VC++ 6.0 platform.

在VC++ 6.0平台上对基于DWT的图像压缩算法进行了实现。

This system is an important part of self-service operation of numerical cont rol machine tool s.

该系统是数控机床的无人化操作的一个重要组成部分，首先对摄像头输入的模拟信号进行数字化处理，然后送到DSP 系统，按新一代图像压缩标准H。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。