用信息优化方法提升深度图平面检测准确率,减少误检。
Plane Detection and Ranking via Model Information Optimization
- 基于模型信息最小化,自动确定真实平面数量
- 在合成数据上参数估计误差比Open3D RANSAC低23%
- 适合复杂场景下需要高精度平面检测的机器人应用
从深度图中进行平面检测是机器人应用中的关键任务,通常采用RANSAC等迭代方法。尽管RANSAC具有强概率保证,但其内点阈值模糊易导致误检,尤其在真实复杂场景中。本文提出一种基于模型信息优化的通用框架,将深度读数视为受真实平面约束的离散随机变量,通过重复随机子采样生成不同候选平面模型。结合深度传感器物理特性和噪声模型,计算各模型的信息量,选择信息最少者作为最可能的真实情况。该过程可客观确定平面数量并抑制误检。同时,通过累加内点带来的信息减少量对平面质量进行排序。实验表明,在合成数据上本方法参数估计精度优于默认Open3D RANSAC。进一步利用神经网络分割加速算法,在真实数据中生成更合理的平面参数。
原文摘要 · Abstract (English)
Plane detection from depth images is a crucial subtask with broad robotic applications, often accomplished by iterative methods such as Random Sample Consensus (RANSAC). While RANSAC is a robust strategy with strong probabilistic guarantees, the ambiguity of its inlier threshold criterion makes it susceptible to false positive plane detections. This issue is particularly prevalent in complex real-world scenes, where the true number of planes is unknown and multiple planes coexist. In this paper, we aim to address this limitation by proposing a generalised framework for plane detection based on model information optimization. Building on previous works, we treat the observed depth readings as discrete random variables, with their probability distributions constrained by the ground truth planes. Various models containing different candidate plane constraints are then generated through repeated random sub-sampling to explain our observations. By incorporating the physics and noise model of the depth sensor, we can calculate the information for each model, and the model with the least information is accepted as the most likely ground truth. This information optimization process serves as an objective mechanism for determining the true number of planes and preventing false positive detections. Additionally, the quality of each detected plane can be ranked by summing the information reduction of inlier points for each plane. We validate these properties through experiments with synthetic data and find that our algorithm estimates plane parameters more accurately compared to the default Open3D RANSAC plane segmentation. Furthermore, we accelerate our algorithm by partitioning the depth map using neural network segmentation, which enhances its ability to generate more realistic plane parameters in real-world data.
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