Abstract:Aiming at the shortcomings of long remote image transmission delay and data loss of traditional image acquisition system, a real-time video acquisition and image transmission system based on ZYNQ chip is designed. The system has two acquisition channels, and the analog video signal is connected to the device through the BNC signal line and digitized by the ADC. The FPGA resources inside the main control chip are used to deploy a parallel processing unit to complete the low-latency processing of digital image data; the data is transmitted to the DDR3 memory in the form of DMA by driving the on-chip AXI bus; the dual-core ARM Cortex-A9 processor inside the chip is used to migrate the embedded Linux system to the acquisition device, and the Gstreamer streaming media application server is built to realize the complex task scheduling of the entire acquisition system and the remote network transmission of image data. Compared with the image acquisition system of the traditional single ARM or DSP processor, the system benefits from the parallel processing capability of the FPGA and the high-bandwidth internal interconnection bus, which improves the image data processing speed, reduces the transmission delay of image data from the acquisition end to the memory, and provides a stable remote image transmission function. The experimental test shows that the system realizes the video signal output of 25 frames per second, which is consistent with the acquisition rate of the front-end ADC. The video picture is continuous and stable during the whole process of collection and display.
