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Accurately estimating rigid transformations in registration using a boosting-inspired mechanism

机译:使用灵感激发机制精确估计配准中的刚性转化

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摘要

Feature extraction and matching provide the basis of many methods for object registration, modeling, retrieval, and recognition. However, this approach typically introduces false matches, due to lack of features, noise, occlusion, and cluttered backgrounds. In registration, these false matches lead to inaccurate estimation of the underlying transformation that brings the overlapping shapes into best possible alignment. In this paper, we propose a novel boosting-inspired method to tackle this challenging task. It includes three key steps: (i) underlying transformation estimation in the weighted least squares sense, (ii) boosting parameter estimation and regularization via Tsallis entropy, and (iii) weight re-estimation and regularization via Shannon entropy and update with a maximum fusion rule. The process is iterated. The final optimal underlying transformation is estimated as a weighted average of the transformations estimated from the latest iterations, with weights given by the boosting parameters. A comparative study based on real shape data shows that the proposed method outperforms four other state-of-the-art methods for evaluating the established point matches, enabling more accurate and stable estimation of the underlying transformation.
机译:特征提取和匹配为对象注册,建模,检索和识别提供了许多方法的基础。但是,由于缺乏功能,噪音,遮挡和背景混乱,这种方法通常会引入错误匹配。在配准中,这些错误匹配会导致对基础转换的不准确估算,从而使重叠形状达到最佳对齐状态。在本文中,我们提出了一种新颖的激发灵感的方法来解决这一艰巨的任务。它包括三个关键步骤:(i)加权最小二乘意义上的基础变换估计;(ii)通过Tsallis熵进行增强参数估计和正则化;以及(iii)通过Shannon熵进行权重重新估计和正则化并使用最大融合进行更新规则。该过程是重复的。最终的最佳基础变换估计为从最新迭代估计的变换的加权平均值,权重由提升参数给出。根据真实形状数据进行的比较研究表明,所提出的方法优于其他四种用于评估已建立的点匹配的最新方法,从而能够更准确,更稳定地估计基础变换。

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