Design And Realization Of Imaging Compression System Based On DSP

Since 1990s, the technology of microelectronic, computer, modern communication and telnet has kept on developing promptly. Now, human beings are entering an era of information explosion. As a result, the need of the processing, transforming, and exchanging of image info becomes more and more urgent. In recent years, the process ability and speed of electronic appliance and equipment has increased greatly; compressing technology of digital image also has made great progress. Therefore, digital image has become the main stream of info expression gradually. The visual compression and storage system described in this paper employs the technology of digital image compression synthetically. In addition, it utilizes the latest appliances. The main features of this system lie in its small volume, automobile record, local compression and storage. Besides, it can work normally without the support of net. This system can do well if the background doesn' t change or only changes a little.The system consists of three parts: image acquirement, real time storage and compression. The integration degree of the CMOS image sensor is high, and it can obtain digital image directly. With the technique of making CMOS image sensor being improved, CMOS image sensor is taking more and more quotient in the market; it even seems to have a trend to replace the traditional CCD image sensor. Electronic hard disk is used in the system for storage. It' s usually made by FLASH. It' s very dependable and its ability to resist impingement is excellent. Besides, its size is small, and it can work in gear in terrible environment. The COMPACT FLASH electronic hard disk that is used by this system has standard IDE interface, is easy to control, be widely used and has become a industry standard. The compressprocessor chip adopts company TI' s fixed-point DSP of series 54x. It' s the core of this system and is in charge of the compression of the image data, the screening of image sensor and the storage of electronic hard disk. For the background is unchangeable, this paper adopts DCT commutation with DPCM, RLC coding, and Huffman' s coding arithmetic of image compressing, and gets favorable effect.