【摘 要】
：
To reduce the charge-coupled device(CCD) readout noise and improve the detection ability un-der low illumination and dim targets,a new low-noise CCD signal processing technology-CCD dig-ital denoise-is gradually being employed in aerospace detection and o
【机 构】
：
Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,P.R.China
论文部分内容阅读
To reduce the charge-coupled device(CCD) readout noise and improve the detection ability un-der low illumination and dim targets,a new low-noise CCD signal processing technology-CCD dig-ital denoise-is gradually being employed in aerospace detection and other fields.In this study,the main readout noise of CCD detectors and its characteristics are analyzed.A CCD digital denoise sys-tem and an experimental platform are designed as well as established by using a PCIe data acquisi-tion card.According to the characteristics of readout noise,some digital filters are analyzed and de-signed based on distributed kernel coefficient,and the optimal kernel coefficients are obtained through iteration.Then,CCD signal and filter model are established,and the optimal filter is de-signed to apply to the digital denoise system.Finally,according to the image data obtained from the system,the performance of the digital denoise system and digital filtering algorithm is evaluated and compared.At 500 kHz and 1 MHz CCD readout rates,the denoising performance of the optimal filter designed in the experiment is 16％-32％ higher than that of the digital filter with kernel distribution coefficient,and 50％-60％ higher than that of the traditional correlated double sampling technology.
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