"基于FPGA的实时视频信号采集与处理系统设计"

Abstract: Images play a crucial role in the acquisition and exchange of information for humans. Nowadays, the application of image processing has expanded into various aspects of human life and work, such as aerospace technology, industrial engineering, military and public security, biomedical engineering, among others. In image processing systems, real-time image acquisition is the front-end part of the entire system and is considered the most important part. The speed and quality of image acquisition at the front end directly impact the algorithm processing and applications at the back end of the image processing system. This paper focuses on designing the front end of an image processing system, specifically the acquisition of video signals. The design utilizes the CMOS image sensor OV7670 for real-time image acquisition, and configures the output signal format of the image sensor using an initialization module designed internally in the FPGA. Based on the timing of its output signal, a capture unit is designed internally in the FPGA. The captured data is sent to a TFT LCD for real-time display, and another route is sent to an SRAM buffer. Once a frame of image is stored, the image is processed in the NIOS II soft core and the processing results are stored in an external storage SD card as an image.Keywords: FPGA; Real-time image; CMOS; Image capture.