光学学报, 2019, 39 (8): 0815001, 网络出版: 2019-08-07   

基于微透镜阵列型光场相机的多目标快速测距方法 下载: 1287次

Multi-Objective Fast Ranging Method Based on Microlens Array Light Field Camera
作者单位
中北大学大数据学院, 山西 太原 030051
摘要
以LYTRO相机为例,提出一种基于微透镜阵列型(MLA)光场相机的多目标快速测距方法。该方法的研究过程分为三个部分:第一部分,通过对原始数据进行点扩展函数计算及色彩恢复,并对数据进行超分辨处理,获取重聚焦序列图像,完成对待测目标的预处理过程;第二部分,利用三角形定理,通过贴片的方法,提出一种直接测距法;第三部分,对现有的相对测距法进行超分辨处理,大幅提高算法精度,同时利用改进型的拉普拉斯算子验证算法的正确性。最后将这两种算法结合,即得到一种MLA光场相机的多目标快速测距算法。实验证明,对于少量待测物体,直接测距法精度高,速度快;对于数量较多的待测物体,将直接测距法与相对测距法相结合,不但能够保证精度,还可以提高时效性。该方法为光场相机深度获取、三维重建等方面的研究提供了重要的数据参考及较为精准的评价依据。
Abstract
Taking LYTRO camera as an example, a fast multi-target ranging method based on microlens array (MLA) light field camera is proposed. The process of the method is divided into three parts. In the first part, the paper acquire the re-focusing sequence images of the data by calculating the point spread function, restoring the color of the original data and conducting the super resolution. Then the pretreatment process of the target is completed. In the second part, a direct ranging method is proposed by using the principle of triangle and patch method. In the third part, the existing relative ranging method is optimized by super-resolution processing, which greatly improves the accuracy of the original algorithm. At the same time, the correctness of the algorithm is verified by the improved Laplace operator. Finally, a fast multi-target ranging algorithm for MLA light field camera is obtained by combining the two algorithms. Experiments results show that, for small number of objects to be measured, the direct ranging method is with high accuracy and fast speed, and for large number of objects to be measured, the combination of direct ranging method and relative ranging method can not only ensure the accuracy, but also greatly improve the timeliness. The proposed method can provide important data reference and more accurate evaluation basis for depth acquisition and three-dimensional reconstruction of light field camera.

孙福盛, 韩燮. 基于微透镜阵列型光场相机的多目标快速测距方法[J]. 光学学报, 2019, 39(8): 0815001. Fusheng Sun, Xie Han. Multi-Objective Fast Ranging Method Based on Microlens Array Light Field Camera[J]. Acta Optica Sinica, 2019, 39(8): 0815001.

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