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用于视场扫描或者像移补偿的指向反射镜在摄像时的低频角度抖动导致相邻帧间推扫距离产生差异,按照帧间等像素间隔方式输出图像会导致局部畸变。为研究角抖动引起畸变的原因、特点以及校正方法,在航天遥感器像移补偿模型基础上建立图像畸变计算模型,准确引入轨道参数、卫星姿态和指向镜安装方位等因素。在具体参数下仿真得到靶标畸变图样,并采取以特征点像移量来校正图像输出的方法。分别对指向镜无抖动、有抖动两种情况下校正后的图案做最小二乘拟合。仿真结果表明畸变大小除了与轨道、抖动参数有关外,还与景物方向有关,理想状况下采用的畸变校正方法精度优于1pixel;实验验证也取得了较好效果。
The low-frequency angular jitter used in field-of-view scanning or image compensation-compensated pointing mirrors results in differences in the pan-sweep distances between adjacent frames, and the output of images at the same pixel-by-frame intervals results in local distortion. In order to study the reason, characteristic and correction method of distortion caused by angular jitter, an image distortion calculation model is established based on image compensation model of space remote sensor, and the orbital parameters, attitude of satellite and orientation of directional mirror are introduced accurately. The target distortion pattern was simulated under the specific parameters, and the method of correcting the image output with the feature point image shift was adopted. Respectively, to the mirror without jitter, jitter two cases do the least squares fitting after the correction of the pattern. The simulation results show that besides the orbit and jitter parameters, the distortion is related to the direction of the scene. The accuracy of the distortion correction method under ideal conditions is better than 1 pixel. The experimental results also achieved good results.