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根据科学级CMOS(sCMOS)图像传感器开发的工程实际需求,设计了基于FPGA的二阶多项式拟合的非均匀性校正算法。该非均匀性校正算法首先通过定标得出每个像素的响应曲线,然后采用最小二乘法将sCMOS像素响应曲线参考平均响应曲线进行拟合,得出校正系数并通过FPAG对像素值进行实时校正。通过处理后的图像非均匀性从17.1%降低到7.6%。该算法有效提高了sCMOS器件对高动态、非线性响应特性的适应能力,并具备实时计算校正优点,通过模块化设计可以方便移植和集成。
According to the actual engineering requirements of the development of the science-level CMOS (sCMOS) image sensor, a non-uniformity correction algorithm based on the second-order polynomial fitting of FPGA is designed. The non-uniformity correction algorithm firstly obtains the response curve of each pixel by scaling, and then uses the least square method to fit the reference response curve of the sCMOS pixel response curve to obtain the correction coefficient and real-time correction of the pixel value by FPAG . The image non-uniformity is reduced from 17.1% to 7.6% after processing. This algorithm effectively improves the ability of sCMOS devices to adapt to high dynamic and nonlinear response characteristics, realizes the advantages of real-time calculation and correction, and facilitates the transplantation and integration through the modular design.