基于双谱相位算法的无人机图像定位研究

由于传统的定位方法都有不同程度的缺陷,如GPS导航或者捷联惯导,所以借助图像匹配技术实现无人机导航定位具有重要研究意义。双谱中只提取相位信息,形成基于相位谱的算法,能很好地抑制不均匀的光照度变化等。首先以对数-极坐标方式进行相位谱的采样处理,然后由相位相关算法获取尺寸和旋转校正值。校正之后,再由相位相关算法进行2幅图像之间的平移配准。仿真结果验证了该算法不仅有很高的配准精度,而且有很强的稳健性。

Researches on UAV Image Matching Based on Phase-Only Bi-spectrum

Because there are much disadvantages in variant extent for conventional positioning methods,such as GPS and strap-down inertial navigation,etc.,it is very significative that we realized UAV navigation and positioning with the method of image matching.Only the phase information is extracted from the bi-spectrum in order to form the algorithm of phase-only bi-spectrum,which can restrain better the nonuniform illumination changes.The scale and the rotation parameters are estimated from the log-polar sampled spectrum using phase-correlation.After revising these parameters,the translation parameter is then matched using the phase-correlation.The simulation result shows that the algorithm is not only precise for matching,but also quite robust.