为定量分析动态漂移时的像旋对成像质量影响的程度,基于动态环扫成像理论,建立一种静态影像与动态漂移间的融合模型。然后结合面阵CMOS相机成像特点与动态运动特性,提出对像旋矢量进行分解处理再融合的仿真模拟方法,设计了一种动态环扫画幅影像像旋仿真分析方法,获取了不同动态成像参数下的模拟影像。最后利用成像幅宽、地面分辨率、成像系统信噪比、峰值信噪比及结构相似性等指标对模拟影像进行定量评估分析。仿真结果表明,相机曝光时间越长,成像系统信噪比越高,像旋越大,成像质量越差,结构相似性越小。研究结果可为未来多种动态成像模式设计中减小像旋影响、提高相机成像质量提供有效的参考。

To quantitatively analyze the influence of image-rotation on the image quality during dynamic drift, a fusion model comprising a static image and dynamic drift is proposed based on the dynamic circular scanning imaging theory. A simulation method of image-rotation vector decomposition and refusion is designed based on the imaging and dynamic motion characteristics of area array CMOS camera. Further, an image-rotation simulation analysis method of the dynamic circular scanning format image is designed. Thus, all simulated images under different dynamic imaging parameters are obtained. Finally, the parameters of image width, ground resolution, signal-to-noise ratio, peak signal-to-noise ratio, and structural similarity are used to quantitatively evaluate and analyze the simulated images. Simulation results show that a longer exposure time of camera corresponds to a higher signal-to-noise ratio of the imaging system, larger image rotation, worse imaging quality, and smaller structural similarity. The results of this research can provide an effective reference for reducing the influence of image-rotation and improving the image quality of the camera in the future design of multiple dynamic imaging modes.