Design Of Image Compressing And Transimitting System Based On DSP

At present, with the development of image compressing technology and signalprocessing technology, compressed image data can not only decrease the capacity of dataand bandwidths, but also can be transmitted through general channels, such as video TV,video phone, etc., however, due to its complexity, high price and demand on morebandwidths, it is difficult to be transmitted through public switch telephone net (PSTN).Since PSTN has enjoyed great popularity nowadays, it is very urgent for us to make fulluse of the resources to meet the keen demand of video surveillance and imagecommunication. In fact, active image transmission is not demanded on many situations inour daily life, several frames per second of still image is enough to meet the demand.Based on this demand, this paper deals with the issue of image coding and low ratetransferring based on digital signal processor (DSP). First, the system scheme is stated at the beginning the paper, C5416 has been used asmain processor, CMOS image sensor as signal source and CPLD as logical controller.Then, the paper gives a general description of the process of this system. As follows, the paper gives details of the three main functional modules: videocapturing module, JPEG coding module and image transferring module. In the videocapturing module, after a brief introduction of the main integrated circuit (IC) OV7620,the paper mainly analyzes the initializing and setting method of this IC and the addressgeneration process of the frame memory. In the JPEG coding module, after an expatiationupon the basic flow and main steps of the JPEG algorithm, the paper puts an emphases onits implementation based on DSP. In the image transferring module, the core ICTL16C750 is illuminated and the hardware and software design is presented in details. At the end of the paper, statements of the whole sytem integration and some ideasabout its improvement have been given.