Analyzing and simulating fracture patterns of theran wall paintings

Shin, Hijung Valentina; D̲oumas, Christos; Rusinkiewicz, Szymon; Steiglitz, K.; Vlachopoulos, Andreas; Weyrich, Tim

doi:10.1145/2362402.2362404

Cited by 11 publications

(13 citation statements)

References 34 publications

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“…Thus, including color and texture information, may provide better results in certain cases [Sagiroglu and Ercil 2006;Fornasier and Toniolo 2005]. However, when considering multiple properties, a classifier is required to estimate the quality of a given alignment, according to all considered criteria Shin et al 2010].…”

Section: Automatic Reconstruction From Fragmentsmentioning

confidence: 99%

A Discrete Approach for Pairwise Matching of Archaeological Fragments

Vendrell-Vidal¹,

Sánchez-Belenguer²

2014

J. Comput. Cult. Herit.

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This paper addresses the problem of automatic reconstruction of ancient artifacts from archaeological fragments. The technique described here focuses on pairwise matching of flat fragments (typically fresco fragments), and it is intended to be the core of a larger system for artifact reconstruction. Global registration techniques are challenging due to the combinatory explosion that happens in the solution space: the goal is to find the best alignment among all possible ones without an initialization. This fact defines the duality between performance and correction that we face in this work. The proposed technique defines a cost function to evaluate the quality of an alignment based on a discrete sampling of the fragments that ensures data alignment. Starting from an exhaustive search strategy, the technique progressively incorporates new features that lead to a hierarchical search strategy. Convergence and correction of the resulting technique are ensured using an optimistic cost function. Internal search calculations are optimized so the only operations performed are additions, subtractions and comparisons over aligned data. All heavy geometric operations are carried out by the GPU on a pre-processing stage that only happens once per fragment.

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Section: Automatic Reconstruction From Fragmentsmentioning

confidence: 99%

A Discrete Approach for Pairwise Matching of Archaeological Fragments

Vendrell-Vidal¹,

Sánchez-Belenguer²

2014

J. Comput. Cult. Herit.

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“…In Computer Graphics, Valette et al [VPLL08] estimated densities of area, length and connectivity of crack patterns to validate their simulation results against real patterns. Shin et al [SDF*10] recently analyzed fracture patterns observed in wall paintings, in order to improve the matching of fresco fragments [FSTF*11]. We rely on a similar set of statistics, but we use them to fit simulation parameters rather than reconstructing the fractured object.…”

Section: Related Workmentioning

confidence: 99%

“…Starting with a photograph of the desired pattern, the location of the cracks is first specified by the user through a standard graphics editor. The obtained pattern is then processed into edges, junctions and fragments, and a set of statistical properties are obtained from them similar to [SDF*10]. The various statistics extracted have different levels of influence on the resulting visual similarity to the exemplar.…”

Section: Overviewmentioning

confidence: 99%

“…Our method starts with an input photograph of a given crack pattern. We extract statistics of the fractures, using features identified in [SDF*10], such as fragment area, crack edge length, orientation or straightness. We then perform a perceptual study to establish that these statistics are indeed correlated with visual similarity between fracture patterns, and to determine the relative importance of each statistic in the perception of similarity.…”

Section: Introductionmentioning

confidence: 99%

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Example‐Based Fractured Appearance

Glondu

Muguercia

Marchal

et al. 2012

Computer Graphics Forum

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A common weathering effect is the appearance of cracks due to material fractures. Previous exemplar‐based aging and weathering methods have either reused images or sought to replicate observed patterns exactly. We introduce a new approach to exemplar‐based modeling that creates weathered patterns on synthetic objects by matching the statistics of fracture patterns in a photograph. We present a user study to determine which statistics are correlated to visual similarity and how they are perceived by the user. We then describe a revised physically‐based fracture model capable of producing a wide range of crack patterns at interactive rates. We demonstrate how a Bayesian optimization method can determine the parameters of this model so it can produce a pattern with the same key statistics as an exemplar. Finally, we present results using our approach and various exemplars to produce a variety of fracture effects in synthetic renderings of complex environments. The speed of the fracture simulation allows interactive previews of the fractured results and its application on large scale environments.

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“…Papaodysseus et al in [18] analyze and reconstruct some characteristic patterns in Theran murals, such as spirals, and infer conclusions regarding their painting method. Shin et al [25] use interactive hardware to trace fragment boundaries and geometric analysis algorithms to study their shapes and contacts, so that they create a statistical model for hierarchical fragment synthesis.…”

Section: Introductionmentioning

confidence: 99%

An integrated system for digital restoration of prehistoric Theran wall paintings

Karianakis¹,

Maragos²

2013

2013 18th International Conference on Digital Signal Processing (DSP)

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Abstract-We present a computer vision system for robust restoration of prehistoric Theran wall paintings, replacing or just supporting the work of a specialist. In the case of significant information loss on some areas of murals, the local inpainting methods are not sufficient for satisfactory restoration. Our strategy is to detect an area of relevant semantics, geometry and color in another location of the wall paintings, which in turn is stitched into the missing area by applying a seamless image stitching algorithm. An important part of our digital restoration system is the damaged and missing areas detector. It is used in combination with total variation inpainting at first for the missing area extraction and repair, and secondly for the elimination of minor defects on the retrieved part in the non-local inpainting mechanism. We propose a morphological algorithm for rough detection and we improve upon this approach by incorporating edge information. For missing areas with complicated boundaries we enhance the detection by using iterated graph cuts.

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Analyzing and simulating fracture patterns of theran wall paintings

Cited by 11 publications

References 34 publications

A Discrete Approach for Pairwise Matching of Archaeological Fragments

A Discrete Approach for Pairwise Matching of Archaeological Fragments

Example‐Based Fractured Appearance

An integrated system for digital restoration of prehistoric Theran wall paintings

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