全景图像镶嵌中累积误差的分析与减少方法研究

An accumulated error analysis and a reduction method for panoramic mosaic images

针对全景图像镶嵌中累积误差的问题,提出了一种基于多次柱面投影的变换基准图策略。首先,为了将累积误差有效地分散到各相邻图像之间,并减少柱面投影变换的计算量,算法利用相位相关和多分辨率分解法对柱面投影算法进行了改进;然后,利用改进变换基准图的分层匹配策略对图像序列进行镶嵌,避免了误差的单向累积;最后,运用拉普拉斯算子对镶嵌图像分级融合,消除了镶嵌缝隙。实验结果表明,该方法可以大大减弱镶嵌过程中累积误差的影响,提高图像的镶嵌精度。

In order to solve the problem of the accumulated error in panoramic mosaic images, we propose a reference image transformation strategy based on multiple cylindrical projections. Firstly, we improve the cylindrical projection algorithm by combining the phase correlation and the multiresolution decomposition to effectively distribute the accumulated error of the adjacent image and reduce the amount of computation in the cylindrical projection transformation. Secondly, we adopt the strategy of hierarchical matching based on reference image transformation to perform image sequence mosaic, which can avoid unidirectional error accumulation in the mosaic. Finally, we utilize the Laplacian operator to carry out step fusion, which generates highquality results and renders a seamless output panorama. Experimental results show that the proposed strategy can greatly reduce the impact of accumulated error in the process of mosaic and improve mosaic precision.