Research Of JEPG Technology On C6000 Series DSP

The JPEG image compress program described in this paper is a module of Carplate Recognition System developed by Wisesoft Ltd. It runs in embedded system operating conditions, must be realtime response. It must have property image compress rate with good image quality and easy to update. Consider on these factors the compress module use JPEG technology.JPEG Standard is a mature image compression technology. It has the advantage of high compress rate with little rate distortion and high run-time speed, it is easy to implement and is applicable to a large field. It has been widely supported since the last teen years when it became international standard. The platform of compression application is base on TI(Texas Instruments) DSP -- TMS320DM642. It is a high performance DSP with high speed and rich external interface for multimedia application. We implied the JPEG compression program on this platform, and summarize our work in this paper.First of all, the paper introduces the meaning of implement of JPEG on realtime system.In succession the detail of JPEG compression standard is introduced. After introducing the JPEG work modes, we describe the Sequential Encoding Mode of JPEG and discusses the color space and file format of JPEG.The paper then describes the architecture and the pipeline of the CPU and summarized the flow of developing DSP program and the matters of code optimization on DSP.From the working experiences, the paper discussed how to imply JEPG on DM642 and summarized the techniques of program optimizing on this platform. The techniques includes code reconstruction, using compiler, using IMGLIB provided by TI, using SIMD (Single Instruction Multiple Data) and pipeline etc.