| Today, the research field of video gradually from SD to HD era, HD videocapture technology has been widely used in many fields. The imaging quality of thetraditional CCD image sensor acquisition system is good but data transmission andprocessing speed is so slow. It can just achieve real-time rate (25FPS). So, the CCDsensor rule the SD field. HD CCD sensor which comes form SD technology hasexcellent imaging quality, high sensitivity, and low illumination. But the highresolution and high speed performance cannot be satisfied simultaneously, especiallywith great limitations in high-speed moving target shooting.At present, high resolution, high frame frequency is an important characteristicof modern special field camera development. For aerial camera for high frame rateand high resolution requirements, there using the high-end CCD image sensor whichproduced by America, with the timing driving chip, and using the fpga multiplexdrive the CCD sensor, to design a CCD image acquisition system with high speed,doubling the frame rate, so it can achieve two million pixels,60frame/sec anduncompressed real-time image acquisition system. The system hardware circuit isdesigned by Cadence software, mainly includes the CCD signal acquisition andperipheral driving circuit, analog front end circuit and the timing circuit, FPGAcontrol and image processing circuit.The system software is designed based on the hardware platform, includingCCD drive control module, image data receiving and splicing module, AE algorithmmodule and image mirror module.Finally has carried on the system debugging. By experimental verification, thissystem has realized the real-time, stable and reliable work, can output video which is1920×1080@60fps, center resolution of1000TV lines. The whole system isdesigned to meet the high frame frequency and high resolution and real-time imageacquisition and processing, this system occupying less system resources, improve theefficiency of the system. |
