基于DSP的箭载图像编码算法的改进及实现
The Improvement and Realization of Roket-borne Image Coding Based on DM642
【中文摘要】 随着信息技术的不断进步,图像编码技术也得到了迅速的发展。特别是在过去的几十年间,图像编码已经在航天航空领域得到了广泛的应用。由于图像能够提供更加丰富和直观的信息,现其已经作为了一个重要的遥测参数广泛地使用在导弹、火箭等系统的研制过程中。基于航天航空应用领域的图像编码技术在过去大都应用在专用卫星上,由于弹/箭测试环境和要求不同于卫星,所以针对弹/箭遥测中的图像采集和编码技术的研究有着重要意义。本文的研究工作就是选择一种满足弹/箭测试系统要求的图像压缩算法并在基于DSP的硬件平台上得以实现。根据在航天测试中对图像编码的研究特点,本文将算法的选取范围定位于JPEG与JPEG2000两种静态图像压缩标准。通过两种算法的性能对比研究,最终将JPEG2000作为本课题的重点研究对象,同时针对该算法中复杂度最高的块编码部分进行了改进和优化,提出了一种适合嵌入式系统应用的图像编码算法,并结合本课题基于DM642的硬件开发平台实现了算法的系统移植。
【英文摘要】 With unceasing progress of information technology, image coding technology also obtained the rapid development. Specially, image compression coding already got the widespread application in astronautics in the past decades. Because the image can supply richer and direct-viewing information, it is already used as an important remote-sensing parameter to be used in the process of developing missile and rocket. Image coding technology based on aviation almost is applied on special satellite, so the research of image collection and coding technology aimed at missile/rocket has an important meaning.This research’s job is to select an algorithm to satisfy missile/rocket test system and realize it based on hardware platform. According to image coding characters of aerospace test, this paper’s algorithms are fixed in two still image compression standard: JPEG and JPEG2000. By contrast of two algorithms’performance, ultimately our paper chooses JPEG2000 as our priority research object; and also we improve and optimize to the block coding part whose algorithm complexity is highest; at last it suggests a image coding algorithm which is fit to an embedded operating system, and it realizes algorithm’s system transplantation which is based on DM642 hardware platform.
【中文关键词】 图像压缩; 箭载; JPEG2000; DM642
