由于航空相机拍照时存在像移，会导致成像质量下降，因此在航空相机中必须有像移补偿机构。目前一般采用主观判据，即通过人眼判别是否存在像移以及像移量的大小，来评价像移补偿系统的性能是否达到设计要求。主观判据受人的主观性影响较大，而且只能定性评价。为了建立航空相机成像质量与像移补偿系统其他指标之间的直接关系，提出使用倾斜刃边法测量航空相机像移的调制传递函数(MTF)。设计了相应的实验，实验中通过转台的转动模拟航空相机的扫描像移，分别通过倾斜刃边法测量像移的MTF和通过理论模型计算像移的MTF。实验结果表明，在空间频率为0.10 cycle/pixel时，转台以3、5、8°/s转动时，两种方法得到的MTF之间的误差百分比分别为0.77%、1.15%、4.91%，进而证明了该方法的有效性。

Image motion of aerial camera during exposure time leads to the degradation of image quality, so image motion compensation system is essential for aerial camera. Subjective criterion, namely image motion is distinguished by human eyes, is always used to evaluate whether the performance of the image motion compensation system meets the design requirements. Subjective criterion is usually influenced by people, and only provides qualitative evaluation. In order to establish the direct relationship between image quality of aerial camera and other index of image motion compensation system, modulation transfer function (MTF) measurement of image motion based on slanted-edge method is presented. Then experiment is designed to verify this method. Image motion caused by scanning of aerial camera is simulated by the rotation of turntable, and the MTF of image motion is obtained by two ways. One is measured by slanted-edge method, and the other one is calculated by theoretical model. Experimental results show that when spatial frequency is 0.10 cycle/pixel and the turntable rotates at 3, 5, 8°/s, the difference between the MTF obtained by the two methods is 0.77%, 1.15%, and 4.91%, thus the effectiveness of this method is demonstrated.