Design And Implementation Of Embedded Image Collecting Platform

In all kinds of the recruitment of students’ tests and qualification exams, there is a phenomen that someone else replaces tester to take examination. It needs to be quickly and clearly collected the image of candidates by all the entrance examination and enrollment units at the scene of the candidates signing up for examination. It also needs all the entrance examination and enrollment units to confirm identity of the candidates from a variety of sources before the candidates entering the test room. Therefore, it is a difficult task for all the entrance examination and enrollment units conveniently, quickly and clearly to get the information of the image of the candidates. At present, most of the image acquision systems are composed of CCD camera, video capture card and computer. However, there are many disadvantages in these kinds of systems, such as complex structure, high cost and big size and so on. In recent years, with the development of sensing technology, semiconductor technology and embedded systems, a new system of collecting images called the image acquisition based on embedded system have been focused on. The image acquisition based on embedded system has a bright prospect of development, because it has lots of advantages, such as simple structure, low cost, small size and great flexibility. It effectively overcomes the disadvantages of traditional image acquisition system. Therefore, it has a profound significance for the work of entrance exams to further study and design a sort of embedded system collecting images.Embedded system is a computer system, which is based on computer technology, focus on application, its software and hardware could be pruned, furthermore, it has particular requirement for its reliability, cost, volume and power consume.Embedded system is relative to computer system structure, encode theory and work theory, and come down to all kinds of computer interface and memory technology, such as serial and network interface, Flash and SDRAM memory technology. In addition, the processor, interface and memory device will be different according to different applications, but, they have little in common in researching and developing method of embedded system, so, it is significative to research it deeply.Grasped the theory and compiling environment of uboot, directed towards the character of ADSP BF561processor, uboot is transplanted. Then, transplanted uClinux by adding and amending relative files for development board after analyzing the process of uClinux startup. Combining with the actual needs of collecting images in entrance examinations and using the modularization design philosophy, the video acquisition module, the dual-core driver module and the Web Boa transplantation module are carried on the detailed design. On the basic of understanding the fundamental principle of the dual-core communication the design of dual-core driver module is completed by the dual-core structure characteristic of the development platform. The uClinux operating system is run in A nuclear and the video processing algorithm is run in B nuclear. The Web Boa functional feature and configurated method are analyzed. The Web Boa is successfully transplanted to the development platform. Meanwhile using the MFC Activex control in the VC++6.0can be achieved the image display and the paper gives a test result.The result shows that the operation of the whole system runs normally. The clearer images can be seen from the acquisition of the camera in the browser.