Adaptive optimization algorithm for CDS control parameters of high-speed CCD

作者：Mo Si Te^*

来源：Journal of Sichuan University(Engineering Science Edition), 2011, 43(1): 143-148.

• Adaptive optimization algorithm
• CdS
• Charge Coupled Devices(CCD)
• Control parameters
• Correlated double sampling
• Correlated Double Sampling(CDS)
• Data sampling
• Edge profile
• Exposure parameters
• Fixed targets
• High-speed
• High-speed CCD
• In-field
• RESET pulse
• Signal to noise
• Square sum
• Tenengrad function

The signal-to-noise ratio of Charge Coupled Devices(CCD) output can be improved by the optimization of control parameters of Correlated Double Sampling (CDS). However, the control parameters of CDS of high-speed CCDare difficult to determine from experiments. An adaptive algorithm was proposed to get a better signal to noise ratio of CCD output. With fixed target and exposure parameters, the CDS control parameters such as the width of reset pulse, the timing of noise sampling and data sampling were tuned. The images on all combination of the CDS control parameters were acquired. The square sum of the Tenengrad function of all pixels on each image was used to evaluate the quality of the image. The combination of three CDS parameters corresponding to the maximum sum was chosen as CDS control parameters, resulting the best signal-to-noise ratio of the CCD out. Finally, the algorithm was implemented in Field-Programmable Gate Array (FPGA) and the experiments results showed that compared with the best image acquired without adaptive algorithm, the parameters of Edge Profile are improved from 507.4 pixels per PH to 763.8 pixels per PH, the parameters of MTF50 improved from 526.5 LW/PH to 937.8 LW/PH. It showed that adaptive algorithm can effectively improve the signal to noise ratio of CCD output.

• 出版日期2011
• 单位四川大学