AdaContour: An Adaptive Contour Descriptor with Hierarchical Representation for Accurate Shape Modeling

核心概念

AdaContour employs multiple local contour representations to effectively capture complex and irregular object shapes, outperforming existing angle-based contour descriptors that use a single global representation.

摘要

The paper proposes AdaContour, an adaptive contour descriptor that uses a hierarchical representation to accurately model complex object shapes. Existing angle-based contour descriptors, such as Eigen and ESE, suffer from lossy representations for non-starconvex shapes due to their use of a single global inner center and polar coordinate parameterization.
To address this, the paper introduces a novel hierarchical encoding procedure that recursively subdivides the shape until sufficiently regular regions are identified. Each refined region is then encoded by a local contour, allowing AdaContour to better capture irregular boundaries. The paper also utilizes robust subspace recovery techniques and basis-sharing mechanisms to efficiently represent the local contours.
Experiments show that AdaContour outperforms existing angle-based descriptors in accurately representing complex shapes, while retaining computational efficiency. The paper also demonstrates the integration of AdaContour into an object detection framework for instance segmentation, exhibiting favorable performance compared to conventional methods.
The key highlights of the paper are:

Hierarchical encoding of object shapes using multiple local contour representations to handle non-starconvex shapes.
Robust subspace recovery and basis-sharing techniques to enable efficient and accurate shape approximation.
Validation of AdaContour's effectiveness through instance segmentation experiments, outperforming existing angle-based descriptors.

統計資料

The paper reports the following key metrics:

IOU (Intersection over Union) between ground-truth and reconstructed object masks on the KINS, SBD, and COCO2017 datasets.
Average Precision (AP) scores for instance segmentation on the SBD validation dataset.

引述

None.

從以下內容提煉的關鍵洞見

AdaContour: Adaptive Contour Descriptor with Hierarchical Representation

by Tianyu Ding,... 於 arxiv.org 04-15-2024

https://arxiv.org/pdf/2404.08292.pdf

深入探究

How can the hierarchical representation in AdaContour be further leveraged for other computer vision tasks beyond instance segmentation, such as shape deformation, registration, and matching

The hierarchical representation in AdaContour can be further leveraged for various computer vision tasks beyond instance segmentation. One potential application is shape deformation, where the hierarchical encoding can be used to manipulate individual local contours while preserving the overall shape structure. By adjusting the local contours at different levels of hierarchy, one can achieve controlled shape deformations without compromising the overall shape integrity. This can be particularly useful in tasks like morphing objects or generating variations of shapes for creative applications.
Another application is shape registration and matching. The hierarchical representation in AdaContour provides a structured way to encode shapes, making it easier to compare and match shapes based on their hierarchical contours. By aligning the local contours at different levels of hierarchy, one can establish correspondences between shapes and perform accurate shape registration. This can be beneficial in tasks like object recognition, shape analysis, and 3D reconstruction where aligning shapes is crucial for accurate comparisons and measurements.
Furthermore, the hierarchical encoding in AdaContour can be utilized for shape analysis in medical imaging, where understanding the intricate details of shapes is essential for diagnosis and treatment planning. By leveraging the hierarchical contours to extract shape features and patterns, one can enhance the analysis of complex shapes in medical images, leading to improved diagnostic accuracy and treatment outcomes.

What are the potential limitations of the current principal direction divisive partitioning approach used for shape subdivision, and how could alternative techniques, such as skeleton-based methods, be explored to enhance the adaptability of the hierarchical encoding

While the principal direction divisive partitioning approach used for shape subdivision in AdaContour is effective in capturing the main directions of shape variance, it may have limitations when dealing with highly irregular shapes or shapes with intricate details. One potential limitation is the reliance on the direction of minimum data variance for splitting shapes, which may not always capture the most salient features or boundaries of complex shapes. This could lead to suboptimal subdivisions and loss of important shape information.
To enhance the adaptability of the hierarchical encoding, alternative techniques such as skeleton-based methods could be explored. Skeleton-based methods involve extracting the skeleton or medial axis of a shape, which provides a more structured representation of the shape's topology and geometry. By incorporating skeleton information into the hierarchical encoding process, one can ensure that the subdivisions are aligned with the underlying structure of the shape, leading to more accurate and meaningful representations.
Additionally, incorporating geometric constraints or shape priors into the subdivision process could help address the limitations of the current approach. By guiding the subdivision based on known shape properties or geometric rules, one can ensure that the hierarchical encoding captures the essential features of the shape while maintaining adaptability to different shapes and structures.

Given the strong performance of AdaContour, how could the insights from this work inspire the development of more effective contour descriptors that can be seamlessly integrated into end-to-end deep learning pipelines for various vision applications

The strong performance of AdaContour provides valuable insights for the development of more effective contour descriptors that can be seamlessly integrated into end-to-end deep learning pipelines for various vision applications. One key takeaway is the importance of hierarchical representation in capturing complex shape information effectively. This insight can inspire the design of new contour descriptors that leverage hierarchical encoding to enhance shape analysis, object recognition, and segmentation tasks.
Furthermore, the robust subspace projection technique used in AdaContour highlights the significance of robust and efficient subspace learning for contour-based descriptors. This can inspire the development of new contour descriptors that incorporate robust subspace learning methods to handle noisy or outlier-prone data more effectively, leading to more reliable shape representations.
Moreover, the basis-sharing conversion approach in AdaContour demonstrates the efficiency of sharing basis vectors for reconstructing multiple local contours. This concept can be applied to the design of new contour descriptors to optimize memory usage and computational efficiency while maintaining accuracy in shape representation. By adopting similar basis-sharing strategies, future contour descriptors can achieve a balance between accuracy, efficiency, and scalability in vision applications.