一种基于合成孔径聚焦图像的目标测距方法

基于合成孔径聚焦图像提出一种新的目标测距方法。该方法利用小孔成像模型摄像机获取与目标视线垂直的等间隔线阵机位图像序列,并将线阵与目标视线交点处机位的图像作为基准图像。根据图像序列获取各距离段所对应的像差校正叠加图像,计算基准图像中每个像素的邻域与每一幅像差校正叠加图像中相应区域的相似度,并选取相似度随像差校正叠加图像变化的范围大于一预设阈值的像素作为可测距像素,相似度最大的像差校正叠加图像所对应的距离段即为该可测距像素对应目标点所处的距离段。对合成孔径原理进行了仿真分析,并根据摄像机线阵实测数据和航拍序列实测数进行了测距实验。实验表明该测距方法鲁棒性好,算法简单,并且无干扰。

Target Distance Measurement Based on Synthetic Aperture Focusing Image

A novel method is proposed to obtain the target depth. A sequence of images is taken by linear camera arrays spreading perpendicularly to the line of sight. The image from the camera at the intersection of the linear camera array and the line of sight is selected as the reference image. The measurable range is divided into several distance segments. For each segment, a parallax correction stack image is calculated, then the regional similarity of the reference image and the stack image is got. The target distance is in the segment which has maximum similarity of the reference image and the stack image. Without image matching, depth from synthetic aperture focus has good robustness and cannot be influenced by single image error or deviation. Simulation results verify the efficacy of this scheme. Moreover, the range precision is also analyzed. Without electromagnetic pollution, the method has the advantages of concealment.