Design and implementation of non-standard video acquisition system

Non-standard video acquisition is a common requirement in science research, industrial detection and medical instrument. A general analog video signal acquisition scheme using TI DSP video port cooperates with video ADC AD9985 is proposed in this paper. FPGA is used to package AD9985 output data into 16bit width and decrease half of pixel clock frequency, in order to resolve video port bandwidth bottleneck problem. The experiments show that the system can capture a variety of analog video formats, including non-standard video and standard video signals. Resolution of captured video can be up to 2048×2048 in case of frame rate under 30fps, and the captured frame rate can reach up to 400fps in case of resolution under 640×480. The image quality obtained is quite well, and system parameters can be adjusted conveniently.