Abstract
The demand of real-time video display functions in home security and vehicle video recorder ‘applications are rising. A variety of portable webcam image capturing device has been developed and designed in succession. However, the webcam’ interface is not standardized or it still requires additional circuit design to connect to other webcam components. Therefore, it is inconvenient for develop and design. With USB UVC (USB Video Class) class specification is proposed, the USB webcam is applied more widely. Though most USB webcam-related applications are based on the PC host or notebook based, therefore, this study is mainly to design a USB UVC digital image capturing device based on USB 2.0 architecture. The digital image is displayed on the embedded image acquiring system with Android operating system. Meanwhile, the OV7670 COMS IC (OmniVision) and Cyclone II FPGA development board (Altera) are adopted and combined in the USB UVC digital image capturing device. The EZ-USB FX2 USB 2.0 chipset (Cypress) is utilized to design and meet with USB 2.0 devices of UVC specification. The EZ-USB FX2 USB 2.0 chipset can control the SCCB bus to retrieve the OV7670 sensed digital image data. The output image format from OV7670 is YUV422 and users can easily convert image data for further analysis and processing. The V4L video driver is porting in the embedded video capturing system to connect USB UVC digital image capturing device to achieve real-time image capture and display. The development of current study can be further widely used in the application of various portable platforms.
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