Research Of The Acquisition Of Terminal Image In Track Events Based On DSP And Score Judge System

In sports competitions which include race, the accuracy of the athletes' results is decided by high-precision timing and accurate locking in the end point. High-precision timing is very easy to achieve, but the accurate locking in the end point, has been unable to complete through human eye, we must use electronic camera technology. At present, the black-and-white image acquisition and score judge system has been developed and used in small track events in our country. The speed of judge is limited and inconvenient for transplantation. In large-scale tournament, the terminal timer equipments primarily made abroad. Foreign products are very expensive and not suitable for extensive usage. So, it is the need for the development of sports undertakings, also the needs of the market and the most important, and the needs of following the road of national sports science and technology to develop a terminal score judge equipment which has quick, accurate and convenient score judge ability and especially has China's own intellectual property rights. This paper applied DSP (Digital Signal Processing) processor and color linear CCD (Charge Coupled Device) image sensor to the acquisition of terminal image in track events and score judge system. The acquisition of terminal image in track events and pre-processing are carried out in-depth research. DSP as control centre of a terminal image acquisition is responsible for image storage and pretreatment. At the same time, DSP communicates to the master control computer via a USB (Universal Serial Bus) interface and uploads the image to it. The master control computer completes the judge of the athletes' scores. Color linear CCD as image sensor synchronously acquires red, green and blue signals and transmits to the DSP in parallel. This paper focused on the main composing, working principle and realization method of the terminal score judge. The article studied the influences caused by CCD functional parameter to the CCD deferent signal and made the precision up to 1/1000 second through designing appropriate CCD drive circuit. Through the analysis of system requirements, selected the appropriate DSP chip and introduced for its unique performance characteristics of this study, and focused on the design and implementation of hardware and software for synchronization acquisition of the three-way color signal, and achieved no pixel missed accqusision and the fill of time sign. Trough the in-depth analysis of various factors which impact image quality in the process of acquisition of CCD image, proposed two methods. In hardware aspect, selected the chip which has special correlated double sampling circuit and Differential Amplifier to restrain the noise interference and improve Signal Noise Ratio, while in software, took various digital image processing techniques to improve the manifestation result. The keystone of this article was to achieve acquisition, storage and preprocessing of the terminal image, consequently, made pretreatment for score judge on the master control computer. It reduces the burden on the computer , improves obviously the speed of score judge and is ease of transplantation that image storage and pretreatment are processed on DSP instead of on the master computer; It makes judge more accurate using color linear CCD than using black-and-white CCD in the existing system. This paper also put forward the defects that exist in the current system and developing direction in the future.