图像压缩

The complex Daubechies wavelet had some good properties such as compact support,orthogonality,symmetry and approximate linear phase.

小波分析已成为信号和图像处理的有力工具，基于小波分析的图像去噪、压缩、检测、融合等已得到成功应用。

Finally, a data compression method is presented that compresses the raw SAR data by means of wavelet transform and vector quantizer.

一种用小波变换对星载SAR原始数据进行压缩的方法，结果表明，与传统的方法相比，由该方法压缩后的原始数据生成的SAR图像具有更大的信噪比。

In the compression, may enhance picture all aro...

在压缩中，通过设置参数可以提高图像四周的压缩率而不破坏主体。

Software Description: Image Compressor is an award winning compression software that lets you recompress your JPEG file.

Image Compressor 让你可以在极小甚至没有品质损失的情况下根据你所选择的压缩设置压缩你的 JPEG 图像。

The technique usedSD2 PCM method to reduce spatial and spectral redundance of the images.

结果证明该算法提高了高光谱图像的无损压缩的压缩比，同时算法具有简单的优点。

After that, the thesis will introduce an improved EZW algorithm based on scalariform quantization. The new algorithm can fix some redundancy treating in reorganizing the symbol for wavelet coefficients. Finally, we will draw some conclusion after some experiments by comparing the two methods.

同时，从阶梯量化后系数符号的变化规律，提出进一步优化算法，提高图像的压缩比；最后利用对比实验的方法，先对比阶梯量化与传统EZW在性能上的差别，然后再比较新的改进算法是否进一步提高了压缩比。

AIM: To study the compression performance of three-dimensional CT image based on region wavelet SPIHT algorithm, underlaying the previous researches on the compression coding algorithm of two-dimensional X-ray image based on SPIHT target area.

目的：在以往对二维X射线影像进行基于SPIHT的区域压缩编码算法研究的基础上，探讨基于目标区域小波SPIHT算法对三维CT图像的压缩方法。

By mean tests of microstructure test under uniaxial compression, the image sequences of red sandstones' microstructure were continuously gathered and the quantitative parameters were extracted; then the microstructural evolvement of red sandstones under uniaxal compression has been analyzed.

通过单轴压缩微细结构试验，采集红砂岩的微细结构图像系列，提取微细结构量化参数，对不同风化程度红砂岩在单轴压缩条件下微细结构的演化规律进行分析。

The algorithm is designed to work directly on the wavelet compressed domain which possesses the following characters: First of all, the multi-level gradient energy presentation of face pattern is proposed, which not only can highlight the facial parts in possible face patterns, but also can address effectively the problem of unknown size in face detection in compressed domain and therefore avoid the complex resolution transform in arbitrary ratios ; secondly, the skin-color model in YCbCr space is ameliorated to improve the reliability of skin segmentation; finally, a hierarchical detector which integrates the simply rule-based classifiers and complex neural network based classifier is designed to further improve the processing speed.

该方法有3大特点：首先，提出了小波域人脸模式的多级梯度能量描述，在有效表征脸部特点的同时，可避免复杂的压缩域图像缩放操作，首次较好地解决了压缩域人脸检测中尺寸未知的难点；其次，优化YCbCr彩色空间肤色模型，提高肤色分割准确度；最后，在检测器的设计中，将基于规则的简单分类器和基于神经网络的复杂分类器有机结合，进一步加快处理速度。

By analyzing the methods of imaging spectrometer image data compression, the key point of interference figure compression is found out, and the corresponding relationship between interferogram matching and spectrogram matching is analyzed using the basic principle of several spectral matching models.

文章通过分析目前常用的成像光谱仪图像数据压缩方法，确立了决定干涉图压缩的问题关键，在分析实际应用中常用的几种光谱匹配模型的基本原理的基础上，探讨了干涉图匹配和光谱图匹配之间存在的对应关系。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。