【摘要】 随着Internet技术的飞速发展,人们利用图像这种媒介进行交流的需求越来越广泛。文章针对图像数据一般是海量数据,受到网络带宽限制的特点,在基于嵌入式Linux系统平台上实现了JPEG压缩算法。介绍了嵌入式Linux硬件系统的搭建和软件开发环境的建立,接着根据具体平台的特点和实时性要求,对JPEG标准算法在实现上进行了一些改进,然后论述了在宿主机Linux下工程文件的构建,实现对算法实现程序模块的管理,并完成编译、链接后的可执行代码向目标平台的移植。最后书写了测试程序对压缩效果进行观察,达到了22∶1高压缩比和良好的图像效果。更多还原

【Abstract】 With the rapid development of Internet technology, the image gets a great use in our daily communication. Aiming at the fact that the image data is commonly of great capacity and the network bandwidth is limited, the paper realizes JPEG compressed arithmetic on the system platform based on embedded Linux. Firstly, it introduces the building of embedded Linux hardware system and software developing environment; Secondly, it has made some improvements upon the JPEG standard arithmetic on the basis of the characteristic of the hardware platform and the real-time processing demand; Then, it presents the construction of project file which manages arithmetic program modules effectively and accomplishes executable code’s load to target platform. Finally, it gets the effect of 22∶1 compression ratio and good image by testing.更多还原