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Abstraction of 2D Shapes in Terms of Parts
"... Abstraction in imagery results from the strategic simplification and elimination of detail to clarify the visual structure of the depicted shape. It is a mainstay of artistic practice and an important ingredient of effective visual communication. We develop a computational method for the abstract de ..."
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Cited by 20 (3 self)
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Abstraction in imagery results from the strategic simplification and elimination of detail to clarify the visual structure of the depicted shape. It is a mainstay of artistic practice and an important ingredient of effective visual communication. We develop a computational method for the abstract depiction of 2D shapes. Our approach works by organizing the shape into parts using a new synthesis of holistic features of the part shape, local features of the shape boundary, and global aspects of shape organization. Our abstractions are new shapes with fewer and clearer parts.
Two Fast Methods for High-Quality Line Visibility
"... Abstract—Lines drawn over or in place of shaded 3D models can often provide greater comprehensibility and stylistic freedom than shading alone. A substantial challenge for making stylized line drawings from 3D models is the visibility computation. Current algorithms for computing line visibility in ..."
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Cited by 12 (6 self)
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Abstract—Lines drawn over or in place of shaded 3D models can often provide greater comprehensibility and stylistic freedom than shading alone. A substantial challenge for making stylized line drawings from 3D models is the visibility computation. Current algorithms for computing line visibility in models of moderate complexity are either too slow for interactive rendering, or too brittle for coherent animation. We introduce two methods that exploit graphics hardware to provide fast and robust line visibility. First we present a simple shader that performs a visibility test for high-quality, simple lines drawn with the conventional implementation. Next we offer a full optimized pipeline that supports line visibility and a broad range of stylization options. 1
2D artistic images analysis, a content-based survey
"... Automatic artwork analysis techniques are used in numerous image-based applications such as virtual restoration, image retrieval, studies on artistic praxis, authentication etc. This paper first presents a comprehensive survey on 2D artworks analysis for the past ten years. Following a content-based ..."
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Cited by 7 (0 self)
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Automatic artwork analysis techniques are used in numerous image-based applications such as virtual restoration, image retrieval, studies on artistic praxis, authentication etc. This paper first presents a comprehensive survey on 2D artworks analysis for the past ten years. Following a content-based taxonomy, we organize and discuss the literature from low-level features to several high-level layers of concepts. We finally open the discussion with several issues, from cognitive processes implied in the creative process that induce some visual cues, to expressive rendering which is a related research fields that shares the same concerns as artwork analysis.
Using Expressive Rendering for Remote Visualization of Large City Models
- in "Web3D 2006: Proceedings of the 11th International Conference on 3D Web Technology", ACM Press, ACM
, 2006
"... all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. A ..."
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Cited by 7 (0 self)
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all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee.
Active Strokes: Coherent Line Stylization for Animated 3D Models
"... Figure 1: Stylized animation of a galloping horse. From left to right: line samples are extracted from a 3D model; active strokes track the samples; brush paths are attched to the strokes and stylized as circular arcs; two more frames of animation exhibit temporal coherence. This paper presents a me ..."
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Cited by 6 (2 self)
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Figure 1: Stylized animation of a galloping horse. From left to right: line samples are extracted from a 3D model; active strokes track the samples; brush paths are attched to the strokes and stylized as circular arcs; two more frames of animation exhibit temporal coherence. This paper presents a method for creating coherently animated line drawings that include strong abstraction and stylization effects. These effects are achieved with active strokes: 2D contours that approximate and track the lines of an animated 3D scene. Active strokes perform two functions: they connect and smooth unorganized line samples, and they carry coherent parameterization to support stylized rendering. Line samples are approximated and tracked using active contours (“snakes”) that automatically update their arrangment and topology to match the animation. Parameterization is maintained by brush paths that follow the snakes but are independent, permitting substantial shape abstraction without compromising fidelity in tracking. This approach renders complex models in a wide range of styles at interactive rates, making it suitable for applications like games and interactive illustrations.
Animated construction of line drawings
- ACM Trans. Graph. (Proceedings of ACM SIGGRAPH ASIA
"... All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately. ..."
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Cited by 6 (1 self)
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All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
Compatible Embedding for 2D Shape Animation
- IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
, 2008
"... Abstract—We present new algorithms for the compatible embedding of 2D shapes. Such embeddings offer a convenient way to interpolate shapes having complex, detailed features. Compared to existing techniques, our approach requires less user input, is faster, more robust, and simpler to implement, maki ..."
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Cited by 5 (0 self)
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Abstract—We present new algorithms for the compatible embedding of 2D shapes. Such embeddings offer a convenient way to interpolate shapes having complex, detailed features. Compared to existing techniques, our approach requires less user input, is faster, more robust, and simpler to implement, making it ideal for interactive use in practical applications. Our new approach consists of three parts. First, our boundary matching algorithm locates salient features using the perceptually-motivated principles of scalespace and uses these as automatic correspondences to guide an elastic curve matching algorithm. Second, we simplify boundaries while maintaining their parametric correspondence and the embedding of the original shapes. Finally, we extend the mapping to shapes ’ interiors via a new compatible triangulation algorithm. The combination of our algorithms allows us to demonstrate 2D shape interpolation with instant feedback. The proposed algorithms exhibit a combination of simplicity, speed, and accuracy that has not been achieved in previous work.
Expressive Illumination of Foliage Based on Implicit Surfaces
"... This paper presents an approach for vivid representations of foliage based on implicit surfaces. It approximates the complex lighting interaction within the foliage and enables a clear illustration of the general shape and the local density of the foliage, thus supporting the three-dimensional depth ..."
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Cited by 5 (1 self)
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This paper presents an approach for vivid representations of foliage based on implicit surfaces. It approximates the complex lighting interaction within the foliage and enables a clear illustration of the general shape and the local density of the foliage, thus supporting the three-dimensional depth cue of the viewer. Due to its straightforward implementation as a preprocessing step that only adjusts the normal vectors of the geometry, this method has no additional memory requirements during the rendering process, and is especially applicable to real-time visualizations. Furthermore, it may be applied to photorealistic as well as nonphotorealistic visualizations, which both benefit from the modified normal vector information. (a) standard local illumination (b) expressive illumination based on implicit surfaces Figure 1: The characteristics of foliage are not recognizable by using standard local illumination. In contrast, the approach presented in this paper accentuates the general structure and the local density of the foliage, which results in vivid and expressive representations that are applicable to the real-time rendering of large scenes. 1 1
Conjoining Gestalt Rules for Abstraction of Architectural Drawings
"... Figure 1: Simplification of a complex cityscape line-drawing obtained using our Gestalt-based abstraction. We present a method for structural summarization and abstraction of complex spatial arrangements found in architectural drawings. The method is based on the well-known Gestalt rules, which summ ..."
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Cited by 4 (0 self)
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Figure 1: Simplification of a complex cityscape line-drawing obtained using our Gestalt-based abstraction. We present a method for structural summarization and abstraction of complex spatial arrangements found in architectural drawings. The method is based on the well-known Gestalt rules, which summarize how forms, patterns, and semantics are perceived by humans from bits and pieces of geometric information. Although defining a computational model for each rule alone has been extensively s-tudied, modeling a conjoint of Gestalt rules remains a challenge. In this work, we develop a computational framework which models Gestalt rules and more importantly, their complex interactions. We apply conjoining rules to line drawings, to detect groups of objects and repetitions that conform to Gestalt principles. We summarize and abstract such groups in ways that maintain structural semantics by displaying only a reduced number of repeated elements, or by replacing them with simpler shapes. We show an application of our method to line drawings of architectural models of various styles, and the potential of extending the technique to other computer-generated illustrations, and three-dimensional models.
