https://www.npcglib.orgNon-photorealistic computer graphics resources.en-usCopyright 2011, NPCGLibstathis@npcglib.orgMon, 17 Oct 2011 20:50:02 +0100http://blogs.law.harvard.edu/tech/rss600 https://www.npcglib.org/paper.php?entryid=878 https://www.npcglib.org/paper.php?entryid=878 <pre>@inproceedings{Papari:2009:ASI, author = {Giuseppe Papari and Patrizio Campisi and Patrick Le Callet and Nicolai Petkov}, title = {Artistic Stereo Imaging by Edge Preserving Smoothing }, doi = {10.1109/DSP.2009.4786001}, abstract = {Stereo imaging is an important area of image and video processing, with exploding progress in the last decades. An open issue in this field is the understanding of the conditions under which the straightforward application of a given image processing operator to both the left and right image of a stereo pair preserves the stereoscopic perception. In this paper, we explore this problem with application to artistic imaging and we prove that, unlike other methods, artistic operators based on edge preserving smoothing have this desirable property. We also present a novel multiresolution artistic operator, purposely designed for stereo images, which enhances the perception of three-dimensionality by means of a depth driven local scale control. }, booktitle = { IEEE 13th Digital Signal Processing Workshop and 5th IEEE Signal Processing Education Workshop (DSP/SPE'09)}, year = {2009}, editor = {}, volume = {}, number = {}, series = {}, pages = {639--642}, address = {}, month = {}, organization = {}, publisher = {}, note = {} }</pre> Giuseppe Papari, Patrizio Campisi, Patrick Le Callet, Nicolai Petkov Mon, 17 Oct 2011 20:37:25 +0100 https://www.npcglib.org/paper.php?entryid=879 https://www.npcglib.org/paper.php?entryid=879 <pre>@inproceedings{ORegan:2009:SSV, author = {Deirdre O'Regan and A.C. Kokaram}, title = {Skin-Aware Stylization of Video Portraits}, doi = {10.1109/CVMP.2009.15}, abstract = {This paper presents a new non-photorealistic/stroke-based rendering (NPR/SBR) framework for the stylization of videos featuring head shots of people, such as home videos, movies, and camera mobile phone clips. Spatiotemporal skin and edge detection are used to locate and emphasize the semantic content in the stylization process. The SBR portion of the algorithm features novel techniques for motion expression with elliptical brush strokes, brush stroke anchor point distribution, spatio-temporal color-sampling, and brush stroke animation with regard to state-of-the-art issues such as object occlusion and uncovering in the source video. A wide user-accessible parameter space and finishing touches such as cartoon-like edge decoration and other quirky effects empowers a variety of artistic outputs. The resulting stylized sequences are fun and interesting with regard to compression, summarization, motion visualization, story-boarding and art. Both the semantic content, and underlying video motion is highlighted and summarized on every frame of the stylized output sequence. }, booktitle = {Conference for Visual Media Production (CVMP '09)}, year = {2009}, editor = {}, volume = {}, number = {}, series = {}, pages = {35--44}, address = {}, month = {}, organization = {}, publisher = {}, note = {} }</pre> Deirdre O'Regan, A.C. Kokaram Mon, 17 Oct 2011 20:48:47 +0100 https://www.npcglib.org/paper.php?entryid=876 https://www.npcglib.org/paper.php?entryid=876 <pre>@article{Kyprianidis:2011:IVA, author = {Jan Eric Kyprianidis and Henry Kang}, title = {Image and Video Abstraction by Coherence-Enhancing Filtering}, doi = {10.1111/j.1467-8659.2011.01882.x}, abstract = {In this work, we present a non-photorealistic rendering technique to create stylized abstractions from color images and videos. Our approach is based on adaptive line integral convolution in combination with directional shock filtering. The smoothing process regularizes directional image features while the shock filter provides a sharpening effect. Both operations are guided by a flow field derived from the structure tensor. To obtain a high-quality flow field, we present a novel smoothing scheme for the structure tensor based on Poisson's equation. Our approach effectively regularizes anisotropic image regions while preserving the overall image structure and achieving a consistent level of abstraction. Moreover, it is suitable for per-frame filtering of video and can be efficiently implemented to process content in real-time.}, journal = {Computer Graphics Forum}, year = {2011}, volume = {30}, number = {2}, pages = {593--602}, month = {}, note = {} }</pre> Jan Eric Kyprianidis, Henry Kang Mon, 17 Oct 2011 20:09:44 +0100 https://www.npcglib.org/paper.php?entryid=875 https://www.npcglib.org/paper.php?entryid=875 <pre>@article{Slomp:2011:GSF, author = {Marcos Slomp and Michihiro Mikamo and Bisser Raytchev and Toru Tamaki and Kazufumi Kaneda}, title = {GPU-based SoftAssign for Maximizing Image Utilization in Photomosaics}, doi = {}, abstract = {Photomosaic generation is a popular non-photorealistic rendering technique, where a single image is assembled from several smaller ones. Visual responses change depending on the proximity to the photomosaic, leading to many creative prospects for publicity and art. Synthesizing photomosaics typically requires very large image databases in order to produce pleasing results. Moreover, repetitions are allowed to occur which may locally bias the mosaic. This paper provides alternatives to prevent repetitions while still being robust enough to work with coarse image subsets. Three approaches were considered for the matching stage of photomosaics: a greedy-based procedural algorithm, simulated annealing and SoftAssign. It was found that the latter delivers adequate arrangements in cases where only a restricted number of images is available. This paper introduces a novel GPU-accelerated SoftAssign implementation that outperforms an optimized CPU implementation by a factor of 60 times in the tested hardware. }, journal = {International Journal of Networking and Computing}, year = {2011}, volume = {1}, number = {2}, pages = {211--229}, month = {July}, note = {} }</pre> Marcos Slomp, Michihiro Mikamo, Bisser Raytchev, Toru Tamaki, Kazufumi Kaneda Sun, 16 Oct 2011 19:25:59 +0100 https://www.npcglib.org/paper.php?entryid=874 https://www.npcglib.org/paper.php?entryid=874 <pre>@inproceedings{Hsin:2007:ANR, author = {Lin Hsin Hsin}, title = {A Non-Photorealistic Rendering Images By A Handheld Device}, doi = {10.1109/IV.2007.13}, abstract = {From phantom haptic devices, 3D mouse to multimodal interfaces, while the academics contend about the similarities and differences in theoretical approaches and understanding of the next generation of interfaces in the pursuit of formulating research directions; researchers are actively pursuing the emergence of the next generation of human-computer interaction predictions, discussing emerging new interaction styles and interface designs; few or almost none has discussed the exquisite offerings, the use and merits of using simply the age old two-button mechanical mouse in the artistic interactive taxonomy. This paper presents an exclusive range of results created by the autonomous, ubiquitous and pervasive handheld interaction of the mechanical mouse. It discusses the tangible interfaces -- lightweight, tacit, passive, perceptual and non-command line interaction interface. The core of this framework is founded of an event-based dab-and-scribe, press-and-release dexterity in a discrete or continuous process as an user interface widget. It eliminates the necessity of extra input layers, offers instant visualization and demonstrates the embodied interfaces of this handheld device technology. This approach and practice establishes that such handheld device is an indispensable tool that offers endto-end solution from instant conceptualization to visualization thus bridging the gap between desire, creative thinking and realization that reigns. The author, creator of an extensive repertoire of NPR images, compares the sensitivity of this wired two-button mechanical roller ball mouse versus a high precision laser mouse while she profiles the futility of the wireless self-powered optical mouse as well as the pen tablet. }, booktitle = {11th International Conference on Information Visualization (IV '07)}, year = {2007}, editor = {}, volume = {}, number = {}, series = {}, pages = {845--849}, address = {}, month = {}, organization = {}, publisher = {}, note = {} }</pre> Lin Hsin Hsin Sun, 16 Oct 2011 19:12:25 +0100 https://www.npcglib.org/paper.php?entryid=873 https://www.npcglib.org/paper.php?entryid=873 <pre>@article{Browne:2008:GOG, author = {Cameron Browne}, title = {Gaud\'{i}'s organic geometry}, doi = {10.1016/j.cag.2007.09.005}, abstract = {Spanish architect Antoni Gaud\'{i} drew on natural precedent to create fantastic organically inspired designs. This paper examines some common motifs in his works, and demonstrates how simple geometric operations can be applied to polyhedral models to achieve similar results. The importance of the partial hyperbolic paraboloid surface (or hypar) is discussed in this context.}, journal = {Computers \& Graphics}, year = {2008}, volume = {32}, number = {1}, pages = {105--115}, month = {}, note = {} }</pre> Cameron Browne Sun, 16 Oct 2011 18:44:58 +0100 https://www.npcglib.org/paper.php?entryid=872 https://www.npcglib.org/paper.php?entryid=872 <pre>@article{Kubisch:2010:GSV, author = {Christoph Kubisch and Christian Tietjen and Bernhard Preim}, title = {GPU-based smart visibility techniques for tumor surgery planning}, doi = {10.1007/s11548-010-0420-0}, abstract = {Purpose The rating of distances and infiltrations to vital structures is important for the planning of tumor surgery or interventional procedures. To support such an assessment, the target structures should be clearly emphasized in a 3D visualization by ensuring their visibility. Methods Smart Visibility techniques such as Ghosting Views and Breakaway Views are employed. Ghosting Views highlight focus structures by fading out occluding structures and are often used in anatomical illustrations. Breakaway Views reveal the structure by cutting into surrounding structures. As a result, an intersection surface is created that allows relating the focus structure with its surroundings. In this contribution, a specialized GPU-based implementation of these techniques is presented for polygonal models derived from a segmentation of the anatomical structures. Results We present different rendering styles of the techniques and apply them to highlight enlarged lymph nodes in the neck, as well as tumors inside the liver. Compared to other methods, we focus on polygonal models and optimizations. Thus, very high frame rates could be achieved on consumer graphics hardware. Furthermore, we employed markers that support the estimation of distances within the scene and possible infiltrations around the focus structures. Conclusion The parameters for the techniques are defined automatically to aid the employment in clinical routine. Such an application is also supported by the combination and refinement of established rendering techniques.}, journal = {International Journal of Computer Assisted Radiology and Surgery}, year = {2010}, volume = {5}, number = {6}, pages = {667--678}, month = {}, note = {} }</pre> Christoph Kubisch, Christian Tietjen, Bernhard Preim Sun, 16 Oct 2011 18:35:48 +0100 https://www.npcglib.org/paper.php?entryid=871 https://www.npcglib.org/paper.php?entryid=871 <pre>@inproceedings{Teoh:2009:GDF, author = {Soon Tee Teoh}, title = {Generalized Descriptions for the Procedural Modeling of Ancient East Asian Buildings}, doi = {10.2312/COMPAESTH/COMPAESTH09/017-024}, abstract = {Many ancient East Asian buildings are noted for their immense beauty and intricate design. We introduce a graphics modeling library based on a generalized procedural description we formulated to describe East Asian architecture. By setting the desired parameters, a user can create a building in any of the many different styles, such as Chinese, Japanese or Korean. Different building types, such as palace halls, commoner houses, temples, pagodas, pavilions, ceremonial gates and fences, are described by our modeling system. This large range of traditional East Asian styles and structures is significantly more than those supported by existing systems.}, booktitle = {5th International Symposium on Computational Aesthetics in Graphics, Visualization, and Imaging (CAe 2009)}, year = {2009}, editor = {Oliver Deussen and Peter Hall}, volume = {}, number = {}, series = {}, pages = {17--24}, address = {}, month = {}, organization = {}, publisher = {Eurographics Association}, note = {} }</pre> Soon Tee Teoh Fri, 14 Oct 2011 23:57:09 +0100 https://www.npcglib.org/paper.php?entryid=870 https://www.npcglib.org/paper.php?entryid=870 <pre>@inproceedings{Xu:2009:MCC, author = {Ling Xu and David Mould}, title = {Magnetic Curves: Curvature-Controlled Aesthetic Curves Using Magnetic Fields}, doi = {10.2312/COMPAESTH/COMPAESTH09/001-008}, abstract = {We describe 'magnetic curves', a particle-tracing method that creates curves with constantly changing curvature. It is well known that charged particles in a constant magnetic field trace out circular or helical trajectories. Motivated by John Ruskin's advice to use variation in curvature to achieve aesthetic curves, we propose to continuously change the charge on a simulated particle so that it can trace out a complex curve with continuously varying curvature. We show some examples of abstract figures created by this method and also show how some stylized representational forms, including fire, hair, and trees, can be drawn with magnetic curves.}, booktitle = {5th International Symposium on Computational Aesthetics in Graphics, Visualization, and Imaging (CAe 2009)}, year = {2009}, editor = {Oliver Deussen and Peter Hall}, volume = {}, number = {}, series = {}, pages = {1--8}, address = {}, month = {}, organization = {}, publisher = {Eurographics Association}, note = {} }</pre> Ling Xu, David Mould Fri, 14 Oct 2011 23:57:25 +0100 https://www.npcglib.org/paper.php?entryid=869 https://www.npcglib.org/paper.php?entryid=869 <pre>@article{Brooks:2007:MMP, author = {Stephen Brooks}, title = {Mixed Media Painting and Portraiture}, doi = {10.1109/TVCG.2007.1025}, abstract = {This paper presents a technique for mixed media nonphotorealistic painting and portraiture. The goal of this work is to transform digital images into renderings that approximate the appearance of mixed-media artwork, which incorporates two or more traditional visual media. We achieve this by first separating an input image into distinct regions based on the degree of local detail present in the image. Each region is then processed independently with a user-selected nonphotorealistic rendering (NPR) filter. This allows the user to treat highly detailed regions differently from regions of low-frequency content. The separately processed regions are then smoothly fused in the gradient domain. In addition, we extend our work to the rendering of mixed-media portraits. Portraits pose unique challenges that we address with our method of segmentation, which is based on a composite of face detection and image detail. Our approach offers the user a great deal of flexibility over the end result, while at the same time requiring very little input. This input takes the form of a few simple and discrete choices. The results demonstrate an impressive array of transformational possibilities.}, journal = {IEEE Transactions on Visualization and Computer Graphics}, year = {2007}, volume = {13}, number = {5}, pages = {1041--1054}, month = {}, note = {} }</pre> Stephen Brooks Fri, 14 Oct 2011 21:07:40 +0100