图像压缩

ABSTRACT Fractal image coding, which is also called attractor image coding, is a emergent method of image compression during the last decad...

分形图像编码方法是近十年来诞生并发展起来的一种新型图像压缩方法，它将图像编码为一组收缩映射，由这组收缩映射的不动点近似待编码对象。

So, these standards still couldn't satiate the demands of very low bit-rate applications (under 20kb/s). As to still image coding, even though the performance of wavelet image coding algorithms excel first generation image compression standard JPEG, but they will produce boring mosquito noise at low bit-rates, which are mainly located around image edges.

而在静态图像编码方面，虽然小波图像算法的编码性能远远超过第一代图像压缩标准JPEG，但它在低位率条件下也会出现蚊式噪音，主要集中在图像边缘附近，而且对于包含丰富纹理的自然图像，其编码效率也会急剧下降。

Meanwhile image acquisition is the basis of image processing, compressing and recognizing, so the research on image acquisition system is very important and valuable.

同时图像采集也是进行图像处理、图像压缩、图像识别的基础，所以对图像采集系统的研制有着重要的现实意义和价值。

And these works can't be completed without a set of high-speed image acquisition system. Meanwhile image acquisition is the basis of image processing, compressing and recognizing, so the research on image acquisition system is very important and valuable.

同时图像采集也是进行图像处理、图像压缩、图像识别，从而实现视频监控的基础，所以对图像采集系统的研制有着重要的现实意义和价值。

By the integration of wavelet transforms and fractal coding and by use of self-similarities, the image compression coding based on wavelet transforms and fractal coding is proposed with the iterated function system.

对小波变换、分形压缩编码的原理和特点进行了分析；结合小波变换和分形压缩编码，利用分形的自相似，研究了基於小波域的分形图像压缩方法。

The methods of image compression could be summed up as the lossy and loseless compression.

图像压缩的方法很多，但一般可分为有损压缩和无损压缩两大类。

All such progress accelerates the fascinating combination of these two algorithms to get more practicable compression methods.

本文在分析传统分形图像压缩和小波图像压缩的基础上，对两者相结合的途径和方法进行了探讨。

A rate-distortion model is presented in order to make use of the down channel of deep space effectively and analyzed the error of image loss compression exactly.It is fit for CCSDS image compression standards based on wavelet transform.

为了能更好地利用有限地深空通信下行信道资源，更准确地分析图像有损压缩的失真大小，提出了一种适合于CCS-DS基于小波变换图像压缩标准的速率-失真模型。

A rate-distortion model is presented in order to make use of the down channel of deep space effectively and analyzed the error of image loss compression exactly.It is fit for CCSDS image compression standards based on wavelet transform.

中文摘要：为了能更好地利用有限地深空通信下行信道资源，更准确地分析图像有损压缩的失真大小，提出了一种适合于CCS-DS基于小波变换图像压缩标准的速率-失真模型。

The algorithm has been used in prototype data compression equipment of a spy satellite.

该算法已在某侦查卫星数据压缩样机中实现，实验结果表明，它是一种有效的图像压缩变换，压缩质量接近CDF9/7小波，计算复杂度非常低。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。