Design of large-array CCD real-time display system
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As the CCD camera based on CameraLink interface can not display images without a dedicated data acquisition card and system computer,a kind of simple and real-time image display system was designed for a 4 008×5 344array CCD camera based on CameraLink interface.Two SDRAMs were used in the system to storage images alternately,and the main logical function was accomplished in a Spatan3family Field Programming Gate Array(FPGA)from Xilinx Company.The image data from CameraLink were storaged in a SDRAM by stitching and BIN processing,meanwhile,the image data read from another SDRAM at a speed of 25frame/s(50field/s)were convert to standard TV analog signals by a digital-to-analog encoder chip ADV7300to display in an analog monitor.The verification results show that the system can real-time display the images of the large-array digital aerial camera with different resolutions and their details at a speed of 3.6 frame/s,and also can adjust the brightness of the images to get a good observation according to the weather conditions.The designed system only contains one PCB board and one alanog monitor and has been used in a CCD digital aerial camera with the 4 008×5 344array successfully.