中国科学院云南天文台机构知识库

为改善sCMOS读出电路工艺偏差导致的非均匀性问题,本文提出了自适应多点非均匀性校正方法。算法首先以搜寻最小范数点、阈值比较的方式分别确定最优分段点的位置以及最佳分段数量,然后再根据这些分段信息在各区间段分别进行两点校正。通过该自适应方法可有效改善传统多点法中由于分段参数选择不当导致的校正性能下降。同时,为实现实时的非均匀性校正,文中根据自适应多点法的算法特点,提出了一种与之匹配的嵌入式数据串流校正方案,可在不影响现有相机采集结构以及采集速率的情况下实现非均匀性的校正。

In order to improve the nonuniformity caused by the process bias of sCMOS readout circuit, an adaptive multipoint nonuniformity correction method is presented. The algorithm first determines the location of the optimal segment point and the optimal number of segments by searching for the minimum norm point and threshold comparison, then corrects two points in each interval segment according to the segment information. This adaptive method can effectively improve the correction performance of traditional multipoint methods, which is caused by improper selection of segment parameters. At the same time, in order to achieve real-time non-uniformity correction, a matching embedded data series correction scheme is proposed based on the algorithm characteristics of adaptive multipoint method, which can achieve non-uniformity correction without affecting the existing camera acquisition structure and acquisition rate.