Research And Design Of The Video Detect System Based On DSP Distributed Processing

With the development of the society and the increasing quantity of the vehicles,intelligent traffic becomes necessary. Obtain external images through the camera, utilizethe computer to deal with the picture, to imitate people's vision function, is one of themost effective ways to measure the traffic, so it has become a focus that applyingcomputer vision to traffic administration. This thesis gives a video detect scheme based on DSP distributed processing. Thesystem consists of industrial control computer and DSP board cards, by means of videocapture, image processing, JPEG compressing and data upload, it can perform red lightrunner detect and traffic parameter gathering. The traditional video detect system is madeup of industrial control computer and video capture card, all the work is done at the hostcomputer, but restricted by resource of the host computer, the system is not easy to expand.Compared with the past video detect system, now most work is realized on distributedDSP board cards, the host computer just finishes affairs treatment, so the systematicadvantage embodies in the dependability, expansibility and performance-cost ratio. As aninstance of DSP development based on PCI bus, by utilizing ripe PC framework andoperating environment, this scheme can accelerate the developing progress, and lower thecosts at the same time, so it has a significance of universality. With dual buffer design and ping-pong processing, the systematic real-timeprocessing ability is strengthened. In order to detect the vehicle's motion state, virtualloops are defined on the image sequence extracted from the CCD cameras, then themotion vectors of the virtual loops can be acquired, which can represent the motion stateof the passing vehicles. In addition the thesis does a research on several key technology of DSP programming,especially the software optimizing method, which not only determines whether the cardcan work normally, but also the real-time character. Such debugging course and solutionscan offer reference to late research and application of DSP.