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Optimized algorithm for the spatial nonuniformity correction of an imaging system based on a charge-coupled device color camera

机译:基于电荷耦合器件彩色相机的成像系统空间不均匀校正的优化算法

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摘要

We present an optimized linear algorithm for the spatial nonuniformity correction of a CCD color camera's imaging system and the experimental methodology developed for its implementation. We assess the influence of the algorithm's variables on the quality of the correction, that is, the dark image, the base correction image, and the reference level, and the range of application of the correction using a uniform radiance field provided by an integrator cube. The best spatial nonuniformity correction is achieved by having a nonzero dark image, by using an image with a mean digital level placed in the linear response range of the camera as the base correction image and taking the mean digital level of the image as the reference digital level. The response of the CCD color camera's imaging system to the uniform radiance field shows a high level of spatial uniformity after the optimized algorithm has been applied, which also allows us to achieve a high-quality spatial nonuniformity correction of captured images under different exposure conditions.
机译:我们提出了一种用于CCD彩色摄像机成像系统的空间不均匀校正的优化线性算法,以及为实现该算法而开发的实验方法。我们使用积分器立方体提供的均匀辐射场,评估算法变量对校正质量(即,暗图像,基本校正图像和参考水平)的影响以及校正的应用范围。 。最佳空间不均匀性校正是通过使用非零暗图像,将平均数字水平位于相机线性响应范围内的图像作为基本校正图像并将图像的平均数字水平作为参考数字来实现的水平。应用优化算法后,CCD彩色摄像机成像系统对均匀辐射场的响应显示出较高的空间均匀性,这也使我们能够在不同的曝光条件下实现捕获图像的高质量空间不均匀性校正。

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