关键词: Nios II, ITU656, 字符叠加, UART

Abstract:

Most traditional computer-based endoscopic devices are too large to take along. To solve this problem, an endoscopic video display system is designed, and a character superposition scheme is proposed based on the system. The main control chip of the system is FPGA. The Nios II processor is built in FPGA . The video decoder chip, the encoding chip and related peripherals are used to construct the hardware system of the endoscope. The system video data processing flow, the ITU656 data protocol, the image character superposition principle and the related program design thought are expounded.Realizes the superposition of characters and images under the control of the serial port in the endoscope system. The experimental results show that the system can realize the superimposition of character and image under the control of the serial port in the endoscope,which has the characteristics of simple circuit structure, low cost, small volume and flexible design.

Key words: Nios II;ITU656;OSD;UART