有损压缩

基于Matlab的灰度图像DCT与RLE的混合有损压缩

DCT and RLE Mixed Lossy Compression of Gray Image Based on Matlab

本节主要探讨了有损压缩的评价，分别比较了CR图像压缩效果和CT图像压缩效果。

In this chapter , we have explored the evaluation on lossy compression and studied comparatively the effects of CR and CT images compressions respectively .

一种基于提升小波的SAR图像有损压缩算法

An Algorithm for SAR Imge Lossy Compression Based on Lifting Scheme

简介了当今流行的JPEG有损压缩技术和相移技术。

The popular lossy-JPEG image compression arithmetic and phase-shifting technology are introduced .

有损压缩JPEG在相移法位相解调的应用评估

Evaluation of using lossy-JPEG image compression in phase demodulation with phase shifting method

探讨了基于JPEG的有损压缩方法在相移法位相解调中的应用前景。

Using lossy-JPEG image compression in phase demodulation with phase-shifting method is evaluated .

提出采用不等权重的率失真优化截取SPIHT（Setpartitioninginhierarchicaltrees）算法对干涉高光谱图像进行有损压缩。

Weighted Rate-Distortion Optimization for Set Partitioning in Hierarchical Trees ( SPIHT ) is proposed for interferential hyperspectral image lossy compression .

针对产品协同设计过程中面临的三维CAD产品模型传输困难问题，提出一种基于最佳线性预测的自由曲线曲面的有损压缩算法。

A loss compression algorithm about free-form curve and surface in CAD models is proposed to effectively exchange and transmit the model data in collaborative design environment .

基于DICOM标准的医学影像无视觉损失有损压缩研究

The study of eyesight lossless of medical digital image lossy compression method based on DICOM standard

实验结果表明，该算法对图像剪切、JPEG有损压缩、中值滤波等攻击有很强的鲁棒性，对旋转、噪声等攻击也具备了一定的抵抗能力。

The experiment results show that the algorithm has good robustness on image cut , JPEG and median filter .

该文根据合成孔径雷达（SAR）图像局部相关性较弱，存在相干斑噪声的特点，提出了一种基于提升小波的SAR图像有损压缩算法。

In this paper a new algorithm for SAR image lossy compression based on lifting scheme is brought forward , aiming at special characteristics of SAR imagery .

分析表明去冗余压缩不适合于SAR原始数据，只能采用有损压缩的方法。

Therefore , a conclusion is draw that the no-losing compression is not suitable for SAR raw data , and the losing compression has to be adopted .

MP3编码之所以能达到1：12的压缩比例，主要在于它是依据心理声学模型的有损压缩。

Mp3 compress ratio can reach 1:12 mainly because of its lossy compress method depended on psycho acoustic model .

实验结果表明，该算法对JPEG有损压缩和常见的图像处理有很强的鲁棒性。

The experimental result shows that it has strong robustness in the JPEG compression and other common digital image processing .

对得到的数字水印图像进行添加噪声、JPEG有损压缩以及低通滤波等处理.实验结果表明：基于混沌序列的DCT域数字水印算法所获得的水印对常见的图像攻击具有较好的稳健性。

Experimental results show that the watermarking is robust to common image attacks such as noise , JPEG lossy compression and lowpass filtering , etc.

DC分量嵌入水印是有效的，且具有很好的鲁棒性，能抵御加在已嵌入水印的图像上的剪切、有损压缩的攻击。

Experimental results demonstrate the strategy , which embeds watermarks in DC components is effective and generated good robustness , and images embedded watermarks can withstand attacks which exerted by tailoring , loss compression .

区域水印嵌入方法的提出，进一步提高了水印检测的准确性.试验表明该技术能够很好地抵抗诸如旋转、缩放、剪切和平移等几何攻击以及JPEG有损压缩。

Experiments demonstrate that the technique can well withstand such geometrical attacks as rotation , scaling , shearing and translation , and JPEG lossy compression .

这些数据是未经加工或较好，原材料，并没有被压缩使用的是不完美的像JPEG有损压缩-这意味着你保留更多的细节。

The data is unprocessed or well , raw , and hasn 't been compressed using an imperfect lossy compression like JPEG-meaning you preserve more detail .

它能改善对图像信息的有损压缩处理性能，还可应用于多个ROI区域的无损压缩，具有良好的应用前景。

It is useful to improve image compression . It can be applied to lossless compression of several ROI . It has good future in application .

算法对于JPEG有损压缩、裁剪、加噪、中值滤波等处理都具有较好的抵抗能力，在版权保护方面，具有很好的实用性。

The algorithms are robust to JPEG lossy compression , cropping , noising , median filtering and so on , and it is useful in protecting copyright .

最后，对广义的RoI和背景分别用不同的压缩方法进行压缩.对广义RoI采用无损压缩以保留区域信息，对其余部分采用有损压缩以保留边缘信息。

The extended RoI was compressed by using lossless scheme to preserve detail information and the rest was compressed by using lossy method to maintain edge information .

水印对剪切、JPEG有损压缩、中值滤波、抵抗噪声干扰等常规图像处理手段比较其他的随机序列扩频算法具有更好的鲁棒性。

Compared with the other spread spectrum algorithm , this one is more robust against the typical image processing attacks such as adding noise , filtering and JPEG compression .

同时选取提升框架中的OSF，优化小波系数的分布特性，提高小波图像的能量集中性，使有损压缩效果达到最佳。

Then , the optimal scaling factor is selected to optimize the distribution of wavelet coefficients and improve energy compaction of IWT .

实验发现，无损压缩的图像压缩比为（1.34±0.05）∶1。而有损压缩比越大，AUC越小。

It was found that the lossless CR was ( 1.34 ± 0.05 )∶ 1.For lossy algorithm , the AUC decreased with the increase of CR.

IWT在无损编码与压缩中获得了很大成功，但在有损压缩效率上远低于传统的DWT。

IWT achieves great success in the lossless coding and compression , but its efficiency in the loss compression is far lower than the traditional DWT .

实验结果表明，该水印系统具有良好的透明性，对JPEG有损压缩、噪声、裁剪、锐化、亮度和对比度调整等图像处理有较好的鲁棒性。

The experimental results indicate the watermarks are transparent and robust against some kinds of process such as JPEG compression , noise , cut out , lighteness and contrast adjustment and so on .

算法具有抵抗高度JPEG有损压缩的能力，篡改定位精确，安全性好。（2）提出了基于图像边缘特征的DWT域水印认证算法。

The algorithm has a high resistance to JPEG lossy compression capacity , tampering with positioning accuracy and security . ( 2 ) Proposed DWT domain watermark authentication algorithm based on image edge features .

对于SAR图像有损压缩，主要研究以提升小波变换和集合分裂树量化相结合的算法，而对于无损压缩，则主要研究基于位平面的编码算法。

For the lossy compression of SAR imagery , the dissertation mainly discusses compression algorithms based on the combination of wavelet transform and zero-tree quantization . For the lossless coding of SAR imagery . it mainly discusses coding algorithms based on bit-plane coding .

实验结果表明，DC分量上嵌入隐形水印的策略是有效的，并且具有很好的稳健性，能抵御施加在已嵌入水印的图像上的裁剪、有损压缩、增加亮度和对比度的攻击。

Experimental results demonstrate that the strategy , which embeds watermarks in DC components , is effective and the invisible watermarks thus generated are very robust , and images embedded watermarks can withstand attacks which are exerted by tailoring , loss compression , enhanced brightness and enhanced contrast .

实验结果表明我们的水印方案对高斯噪声、JPEG有损压缩、低通滤波、中值滤波、裁剪、缩放、循环平移、旋转等图像攻击都有很好的鲁棒性。

Experimental results show that our watermarking scheme is robust to Gaussian noise , JPEG lossy compression , low-pass filtering , median filtering , cropping , scaling , cyclic translation , rotation and other image attacks . 3 .