图象压缩

Our experiments show that DSNR of different images in the same scene changes congruously with PSNR, thus can be used to evaluate the quality of decompressed images and image sequences.

实验证明，在相同场景中DSNR能较好地反映PSNR的变化，因而可以用于对同一图象的不同解压缩图象以及图象序列的评价。

On the basis of the attribute theory of knowledge representation, based on database, a model of failure diagnosis knowledge storage is proposed.

为了解决大量铁谱图象信息的存储与传输问题，本文将小波零树压缩编码方法应用于彩色铁谱图象的数据压缩，取得了较好的效果。

In order to solving the packet loss error in network realtime image and video transmission, an efficient balanced multiple description wavelet image robust coding algorithm is proposed, which is based on embedded zeroblock coding and spatial equably subsampling polyphase transform.

针对网络图象和视频传输中不可避免的丢包错误，本文提出基于嵌入式零块压缩编码和空间均匀采样的相位变换的均衡小波图象多表达容错压缩方法——即基于零块编码的多表达小波图象容错编码方法。

The basic theories of mathematical morphology for binary image are stated, and the most simple structure elements of morphologic transformation for binary images are proposed and proved. The geodetic morphologic transformation models are also developed. For the purpose of improving the speed of transformation in computer, the"set symmetric difference"is introduced to adapt each model. Some new morphologic filtering models and quantitative evaluating model of filtering effects in image processing are proposed, under the applied condition. The morphologic thinning methods are studied, and two new morphologic thinning models are developed. On the basis of analyzing the characteristics of mining maps, the image vectorizing tactics and a series of algorithms are proposed, including dynamic adaptive image thresholding using two thresholds, graphic and text separation, noise removal, and multi elements extracting models with mathematical morphology. Accuracy preserving compressed vectorizing model for image vectorization is put forward to generate vector data in multi layer.

论文对二值图象形态学的基础理论进行了较系统的阐述，提出并证明了二值图象处理中形态变换的最简单结构元素，并发展了测地形态变换模型；为了提高形态变换的计算机实现速度，引入了集合论中"对称差"的概念对各形态变换模型进行了改化；针对数学形态学在图象处理中的实际应用，提出了新的形态滤波模型及滤波效果的度量评价模型；研究了形态细化方法，提出了快速形态细化和保形快速形态细化算法；在研究矿图基本特征基础上，提出了人机协同矿图扫描图象矢量化处理策略及一系列扫描图象处理算法模型，包括双阈值动态自适应图象二值化、图文分离、噪声去除、图面多种要素提取形态变换模型等；在图象栅格—矢量转换中，提出了保精度压缩矢量化模型，以生成分层要素矢量数据。

Based on analyzing and comparing the constringent performance of CDF(2,2) and FBI9-7 wavelet, we verify that "there is no wavelet that consistently performs better than all the other wavelets on all the test images."

并通过在自适应算术编码前，重组SPIHT算法后的码流，使本方案中的图象压缩比有进一步的提高。

For fast orthogonal transformation algorithm, the paper carries out detailed research and analysis. In terms of many transform coding, it put forward these four rapid transformation algorithms which are Discrete Cosine Transform, Discrete Fourier Transform, Harr Transform, Walsh-Handmaid Transform, and analysis of these fast algorithms in image compression applications.

对于正交变换的快速算法本文进行了详细的研究与分析，并根据各种变换编码，提出了离散余弦变换、离散傅立叶变换、Harr变换、Walsh-Hadamard变换这四种变换的快速算法，并分析了这些快速算法在图象压缩中的应用。

On the basis of the statistical characterestics of satellite meteorological infrared cloud charts this paper presents a coding algorithm of "Sub sampling+Modified JPEG+Image enlarging",realizing a compression ratio of 50∶1～100∶1, with the PSNR of 35～40dB and visually unperceptible distortion.

依据GMS卫星红外气象云图的统计特性，提出了一种&亚抽样＋修改的JPEG＋图象放大&的静止图象编码方法，使有失真压缩比在50∶1至100∶1时，恢复图象峰值信噪比在35dB～40dB之间，主观质量无视觉可觉察到的失真。

N is the number of pixels to process. bound, which is basically considered as incalculable for the nonce. The feasibility and reliability of proposed method have been verified on a group of ISO test images naturally acquired by various imaging sensors.

对于当前公认基本不可计算的给定图象的无损压缩极限，给出了一个实用的极限估计新方法，在对利用各种不同成象传感器自然获取的十余幅ISO JPEG标准测试图象的实验中显示出该方法的可用性和准确性。

In this method, one of the three color components of a color image is coded using wavelet transform zerotree coding, and the component is segmented into several non overlapping subregions in the same size.

在所见到的有关这方面内容的文献中，对彩色图象的压缩编码，几乎都是对彩色图象的 3个色彩分量分别进行编码，而没有去进一步挖掘 3个色彩分量之间存在的更深层关系，其结果不可避免的是运算量大，压缩比低。

This paper presents an efficient im age compression algorithm that combines the advantages of DCT and wavelet transf orm.

本文提出了一种可在超低比特率情况下使用的高效帧内图象压缩算法。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。