In order to avoid image degradation caused by rolling shutter distortion, CMOS imager sensors (CISs) with global shutter (GS) function are required to capture a picture of the fast moving scene. However, due to parasitic signal generated at the storage node of the GS CIS, the output of the sensor is degraded, which causes the sensor output varying hugely at the same exposure time but different frame rate. Then, the exclusive relationship between radiation intensity and sensor output cannot be obtained through radiometric calibration. The traditional approach is adding the light-shield structure for the storage node. We present here a new variable operation mode of the GS CIS, which makes it possible to automatically adjust the sequence of the sensor operating state on the basis of the relationship between exposure time and frame rate. This operation mode can ensure that the integrity of the stored signal is not compromised during the memory period. The accuracy of detection can be well improved. Furthermore, this new approach is proved valid by comparing the radiometric calibration results of traditional and new operation modes.

为了避免滚动快门失真导致的图像质量下降，需要具有全局快门 (GS) 功能的 CMOS 成像传感器 (CIS) 来捕捉快速移动场景的图片。然而，由于GS CIS存储节点产生的寄生信号，导致传感器输出劣化，导致相同曝光时间但不同帧率下传感器输出变化巨大。那么，辐射强度与传感器输出之间的排他关系是无法通过辐射定标得到的。传统的做法是在存储节点上加遮光结构。我们在这里提出了 GS CIS 的一种新的可变操作模式，它可以根据曝光时间和帧速率之间的关系自动调整传感器操作状态的顺序。这种操作方式可以保证存储信号的完整性在存储期间不被破坏。可以很好地提高检测的准确性。此外，通过比较传统和新操作模式的辐射校准结果，证明了这种新方法的有效性。