【摘 要】
：
An ordinary space optical remote sensing camera is an optical diffraction-limited system and a low-pass filter from the theory of Fourier Optics,and the dig
【机 构】
：
Xi'anInstituteofOpticsandPrecisionMechanics,China
【出 处】
：
2014年光子与光学工程国际会议暨西部光子学学术会议
论文部分内容阅读
An ordinary space optical remote sensing camera is an optical diffraction-limited system and a low-pass filter from the theory of Fourier Optics,and the digital imaging sensors,whether the CCD or CMOS,are low-pass filters as well.Therefore,when the optical image with abundant high-frequency components passes through an optical imaging system,the profuse middle-frequency information is attenuated and the rich high-frequency information is lost,which will blur the remote sensing image.In order to overcome this shortcoming of the space optical remote sensing camera,an on-line compensating approach of the Modulation Transfer Function(MTF)in the space cameras is designed.The designed method was realized by a hardware analog circuit placed before the A/D converter,which was composed of adjustable low-pass filters with a calculated value of quality factor Q.The experiment results display that the realized compensating circuit in a space optical camera is capable of improving the MTF of the system and can enhance their middle frequency of the remote sensing images.
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