| Embedded system has came into our lifetime along with the great development of electronic information technology, and the video capture application in embedded system has became more and more popular. Video capture and processing have became one of the most important applications of embedded system. The PXA270 processor which Intel Corporation brings out for mobile phone and handheld PC uses QuickCapture technology. The technology which gives the interface to video capture device will help to improve the video quality and to reduce the system cost.How to realize the video capture function which includes still-picture snapshot and dynamic-video capture in the PXA270 embedded mobile platform is the main goal of the task. Intel XScale PXA270 development board is used as hardware platform, and WinCE 5.0 embedded operating system is used as software platform. After deep research on video capture technology, Agilent's ADCM-2650 camera module is adopted.In this paper, the principle of video capture and the progress of video compression are first introduced, next the platform which the task bases on is described, and then the hardware realization of video capture is given. Because WinCE5.0 Operating System has not supported video capture software yet, the software driver must be developed and coded. In order to demonstrate the function of video capture, a demo application has to be given. Finally, the performance optimization to video capture playback is performed and the test data is given by experiments.The difficulty of the task lies on the software design and performance optimization of video capture driver. To make sure the quality of the driver, three rules are given: reliability, practicability and flexibility and the method of state-machine is used. After several tests, the final realization has met the designed requirement: the capability of the captured video preview, the capability of still picture capture and compression, the capability of dynamic video capture. |
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