Two Fast Methods for High-Quality Line Visibility

Cole, Forrester; Finkelstein, Adam

doi:10.1109/tvcg.2009.102

Cited by 12 publications

(8 citation statements)

References 22 publications

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“…We use the segment atlas data-structure describe in [Cole and Finkelstein 2010] to compute the visibility of the paths and perform the final rendering of the strokes on the GPU. Nevertheless, our approach could be used with any system that renders lines as textured quads, such as [McGuire and Hughes 2004;Kalnins et al 2002;Isenberg et al 2002;Markosian et al 1997].…”

Section: Resultsmentioning

confidence: 99%

“…It handles partial visibility, which has been shown to be important for temporal coherence [Cole and Finkelstein 2010]. Since we only consider SLAM textures, we do not require a complex, piece-wise fitting scheme.…”

Section: Resultsmentioning

confidence: 99%

“…Note that by design this weighting scheme corresponds to the exact linear interpolation of the parameterization along the spine of the line, if no paths overlap. The weight of the splat can be varied with the partial visibility [Cole and Finkelstein 2010] of the sample, or the z-depth of the sample at that point.…”

Section: Propagating Parametersmentioning

confidence: 99%

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Self-similar texture for coherent line stylization

Bénard

Cole²,

Golovinskiy

et al. 2010

Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering - NPAR 10

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Figure 1: Shapes drawn with stylized lines using self-similar textures. The bird (above) is a purely 2D figure, while lines are extracted from a 3D model of a horse (below). At different scales the lines appear qualitatively similar, and transitions exhibit temporal coherence. AbstractStylized line rendering for animation has traditionally traded-off between two undesirable artifacts: stroke texture sliding and stroke texture stretching. This paper proposes a new stroke texture representation, the self-similar line artmap (SLAM), which avoids both these artifacts. SLAM textures provide continuous, infinite zoom while maintaining approximately constant appearance in screenspace, and can be produced automatically from a single exemplar. SLAMs can be used as drop-in replacements for conventional stroke textures in 2D illustration and animation. Furthermore, SLAMs enable a new, simple approach to temporally coherent rendering of 3D paths that is suitable for interactive applications. We demonstrate results for 2D and 3D animations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Self-similar texture for coherent line stylization

Bénard

Cole²,

Golovinskiy

et al. 2010

Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering - NPAR 10

Self Cite

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“…In rendering, analytically computed edges are used in combination with sparse sampling of the shading effects to generate high-quality images at interactive rates [Bala et al 2003]. Finally, many works in non-photorealistic rendering, including silhouette and informative edges, and suggestive contours [Raskar and Cohen 1999;DeCarlo et al 2004;Cole et al 2009;Cole and Finkelstein 2010], have used the perceptual importance of the edges to achieve the required rendering effect. We supplement these by exploring the importance of edges in the context of displays by introducing the notion of variable spatial resolution display -a display that does not provide uniform pixel density everywhere but produces higher pixel densities at specific regions of the edges.…”

Section: Introductionmentioning

confidence: 99%

Edge-guided resolution enhancement in projectors via optical pixel sharing

2012

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Imaging Lens 2 nd LCD (14x10.5) Scaling Lens d = 25, f = 30 Lens Array d = (7x5.4), f = 42 1 st LCD (14x10.5) Target High Resolution Enhanced Resolution Low Resolution I ne I e I v I Time Sequential Figure 1: Left: This illustrates the basic concept of decomposing a target high resolution image, I, to a high resolution edge image, I e and a complementary low resolution non-edge image, I ne . I e and I ne are then displayed in a time sequential manner to create an image with spatially varying resolution where edges are displayed at a higher pixel density than the rest of the image. We call this the edge-enhanced image, I v . I v is perceptually close to I. Middle: The image from the enhanced-resolution projector compared with a target high-resolution image and a low resolution image. Note that the edge-enhanced image is perceptually almost indistinguishable from the target high-resolution image. Right: A side view of our prototype enhanced-resolution projector that achieves 1024 × 768 edge-enhanced images by cascading two light modulator panels of 512 × 384 resolution (animated illustrations in the video). The numbers in the image are in millimeters. AbstractDigital projection technology has improved significantly in recent years. But, the relationship of cost with respect to available resolution in projectors is still super-linear. In this paper, we present a method that uses projector light modulator panels (e.g. LCD or DMD panels) of resolution n × n to create a perceptually close match to a target higher resolution cn × cn image, where c is a small integer greater than 1. This is achieved by enhancing the resolution using smaller pixels at specific regions of interest like edges.A target high resolution image (cn × cn) is first decomposed into (a) a high resolution (cn × cn) but sparse edge image, and (b) a complementary lower resolution (n × n) non-edge image. These images are then projected in a time sequential manner at a high frame rate to create an edge-enhanced image -an image where the pixel density is not uniform but changes spatially. In 3D ready projectors with readily available refresh rate of 120Hz, such a temporal multiplexing is imperceptible to the user and the edge-enhanced image is perceptually almost identical to the target high resolution image.To create the higher resolution edge image, we introduce the concept of optical pixel sharing. This reduces the projected pixel size by a factor of 1 c 2 while increasing the pixel density by c 2 at the edges enabling true higher resolution edges. Due to the sparsity of the edge pixels in an image we are able to choose a sufficiently large subset of these to be displayed at the higher resolution using perceptual parameters. We present a statistical analysis quantifying the expected number of pixels that will be reproduced at the higher resolution and verify it for different types of images.

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“…Algorithms for hidden line removal in object space [MKG*97, HZ00, GTDS10] avoid this problem at the price of high computational complexity. The segment atlas of Cole and Finkelstein [CF10] provides similar quality at interactive frame rates by exploiting graphics hardware.…”

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confidence: 99%

State‐of‐the‐Art Report on Temporal Coherence for Stylized Animations

Bénard

Bousseau

Thollot

2011

Computer Graphics Forum

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Non-photorealistic rendering (NPR) algorithms allow the creation of images in a variety of styles, ranging from line drawing and pen-and-ink to oil painting and watercolor. These algorithms provide greater flexibility, control and automation over traditional drawing and painting. Despite significant progress over the past 15 years, the application of NPR to the generation of stylized animations remains an active area of research. The main challenge of computer generated stylized animations is to reproduce the look of traditional drawings and paintings while minimizing distracting flickering and sliding artifacts present in hand-drawn animations. These goals are inherently conflicting and any attempt to address the temporal coherence of stylized animations is a trade-off. This state-of-the-art report is motivated by the growing number of methods proposed in recent years and the need for a comprehensive analysis of the trade-offs they propose. We formalize the problem of temporal coherence in terms of goals and compare existing methods accordingly. We propose an analysis for both line and region stylization methods and discuss initial steps toward their perceptual evaluation. The goal of our report is to help uninformed readers to choose the method that best suits their needs, as well as motivate further research to address the limitations of existing methods.

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Two Fast Methods for High-Quality Line Visibility

Cited by 12 publications

References 22 publications

Self-similar texture for coherent line stylization

Self-similar texture for coherent line stylization

Edge-guided resolution enhancement in projectors via optical pixel sharing

State‐of‐the‐Art Report on Temporal Coherence for Stylized Animations

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