Fixed window aggregation AD-census algorithm for phase-based stereo matching

Zhang Shengming; Wu Mingxiong; Wu Yanxue; Wu Gaoxu; Liu Fei

摘要

Phase-based stereo matching (PSM) is a vital step in binocular structured light. PSM is hard to strike a balance between efficiency and accuracy, especially because of the absolute phase matrix's (APM) double data type. It means that PSM needs more run time and memory than conventional intensity images' stereo matching. In this paper, we propose a modified absolute difference (AD)-Census algorithm called the fixed window aggregation AD-Census (FWA-AD-Census) to balance the contradiction between efficiency and accuracy in PSM. The FWA-AD-Census aggregates matching cost in a fixed support window instead of an adaptive support window in AD-Census. We analyze the reason why PSM is more suitable to aggregate the matching cost in a fixed support window. Simulations and experiments are conducted to verify the FWA-AD-Census's performances by comparing the FWA-AD-Census with two other local stereo matching algorithms. One is the AD-Census, which is more accurate but less efficient. Its matching cost is aggregated in an adaptive support window. Another is the sum of absolute difference (SAD), which is more efficient but less accurate, and its matching cost is aggregated in a fixed support window. Theoretical analysis and experimental results both indicate that the proposed algorithm can achieve similar accuracy to the AD-Census with less run time. (C) 2019 Optical Society of America

机译：基于相位的立体匹配（PSM）是双目结构光的重要步骤。 PSM难以在效率和准确性之间取得平衡，特别是因为绝对相位矩阵的（APM）双数据类型。这意味着PSM需要比传统的强度图像的立体匹配更多的运行时间和内存。在本文中，我们提出了一种修改的绝对差异（AD）-Census算法，称为固定窗口聚合AD-CINSUS（FWA-AD-PINEUS）来平衡PSM中效率和准确性之间的矛盾。 FWA-AD-CINSUS在固定支持窗口中汇总成本，而不是Ad-Census中的自适应支持窗口。我们分析PSM更适合在固定支持窗口中聚合匹配成本的原因。通过将FWA-Ad-Pensus与另外两种本地立体声匹配算法进行比较来验证FWA-Ad-Census的性能，进行模拟和实验。一个是ad-pensus，这更准确但效率较低。其匹配成本在自适应支持窗口中聚合。另一个是绝对差异（SAD）的总和，这更有效但更准确，并且其匹配成本在固定支持窗口中聚合。理论分析和实验结果表明，该算法可以在较少运行时实现对广告群体的类似精度。（c）2019年光学学会

Fixed window aggregation AD-census algorithm for phase-based stereo matching

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