arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.03860cs.CVeess.IV
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一种鲁棒的图像拼接方法

A Robust Method for Image Stitching

Grundium Ltd(Grundium有限公司);Aalto University(阿尔托大学)

Matti Pellikka, Valtteri Lahtinen

摘要:

我们提出了一种新的大规模图像拼接方法,该方法对图像中的重复图案和无特征区域具有鲁棒性。在这种情况下,现有技术的图像拼接方法容易产生图像对准伪影,因为它们可能产生在全局连接图内冲突的错误成对图像配准。我们的方法通过收集所有可能的成对图像配准候选人,其中选择全局一致的候选人,增强了当前的方法。这使得拼接过程能够通过利用来自整个图像的所有可用信息来确定正确的成对配准,例如重复图案和无特征区域之外的明确配准。我们将该方法形式化为加权多重图,其节点表示来自合成图像的各个图像变换,并且其两个节点之间的多个边集表示两个图像的像素坐标之间的所有合理变换。边权重表示变换的可扩展性。图像变换和边缘权重从具有线性约束的非线性最小化问题求解,对于该问题使用投影方法。作为一个例子,我们应用的方法在一个大规模的扫描应用程序中的转换主要是翻译只有轻微的旋转和缩放组件。尽管有这些简化,但现有技术的方法在这样的应用中不能产生足够的结果,因为图像重叠很小,这可能是无特征的或重复的,并且未对准伪影及其隐藏是不可接受的。

英文摘要:

We propose a novel method for large-scale image stitching that is robust against repetitive patterns and featureless regions in the imagery. In such cases, state-of-the-art image stitching methods easily produce image alignment artifacts, since they may produce false pairwise image registrations that are in conflict within the global connectivity graph. Our method augments the current methods by collecting all the plausible pairwise image registration candidates, among which globally consistent candidates are chosen. This enables the stitching process to determine the correct pairwise registrations by utilizing all the available information from the whole imagery, such as unambiguous registrations outside the repeating pattern and featureless regions. We formalize the method as a weighted multigraph whose nodes represent the individual image transformations from the composite image, and whose sets of multiple edges between two nodes represent all the plausible transformations between the pixel coordinates of the two images. The edge weights represent the plausibility of the transformations. The image transformations and the edge weights are solved from a non-linear minimization problem with linear constraints, for which a projection method is used. As an example, we apply the method in a large-scale scanning application where the transformations are primarily translations with only slight rotation and scaling component. Despite these simplifications, the state-of-the-art methods do not produce adequate results in such applications, since the image overlap is small, which can be featureless or repetitive, and misalignment artifacts and their concealment are unacceptable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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