In this paper, we consider the problem of imaging a scene with a given depth of field at a given exposure level in the shortest amount of time possible. We show that by 1) collecting a sequence of photos and 2) contro...
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In this paper, we consider the problem of imaging a scene with a given depth of field at a given exposure level in the shortest amount of time possible. We show that by 1) collecting a sequence of photos and 2) controlling the aperture, focus, and exposure time of each photo individually, we can span the given depth of field in less total time than it takes to expose a single narrower-aperture photo. Using this as a starting point, we obtain two key results. First, for lenses with continuously variable apertures, we derive a closed-form solution for the globally optimal capture sequence, i.e., that collects light from the specified depth of field in the most efficient way possible. Second, for lenses with discrete apertures, we derive an integer programming problem whose solution is the optimal sequence. Our results are applicable to off-the-shelf cameras and typical photography conditions, and advocate the use of dense, wide-aperture photo sequences as a light-efficient alternative to single-shot, narrow-aperture photography.
A VR-based training system for practicing biopsies simulates ultrasound imagery by stitching multiple ultrasound volumes on the basis of a 3D scale-invariant feature transform algorithm. In addition, a six-degree-of-f...
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A VR-based training system for practicing biopsies simulates ultrasound imagery by stitching multiple ultrasound volumes on the basis of a 3D scale-invariant feature transform algorithm. In addition, a six-degree-of-freedom force model delivers a realistic haptic rendering of needle insertion.
The logo of computer design is easier to identify, graphics have more features and personality, creation of color is free, unrestrained, and easier to stand out from the ordinary work, to achieve the purposes of publi...
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Visualization PhD students or researchers starting a research project or initiating research on an unfamiliar topic often review the scientific literature about their research topic. This start-up phase involves wadin...
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Visualization PhD students or researchers starting a research project or initiating research on an unfamiliar topic often review the scientific literature about their research topic. This start-up phase involves wading through and reading scores, if not hundreds, of published research papers. Reading these papers and capturing their essential information is a challenge. Furthermore, the difficulty only increases over time as the publications' complexity and quantity increase. However, remembering all the details of what you've read isn't necessary. Several simple guidelines can help students and researchers read—that is, extract the essential, most important information from—visualization research papers. [ABSTRACT FROM PUBLISHER]
computer graphics has undergone a formidable development in the past few decades, starting from the humble origins of tracing some lines on simple but expensive displays to the stunning realistic images that one can s...
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computer graphics has undergone a formidable development in the past few decades, starting from the humble origins of tracing some lines on simple but expensive displays to the stunning realistic images that one can see and use on commodity hardware today. It is, and remains, an exciting field that combines many areas of computer science and of mathematics.
Over the last two decades, there have been many high profile success stories where cutting edge computer graphics (CG) technology was used in collaboration with cultural heritage (CH) professionals to unlock the secre...
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Over the last two decades, there have been many high profile success stories where cutting edge computer graphics (CG) technology was used in collaboration with cultural heritage (CH) professionals to unlock the secrets of humanity's legacy. Well known examples include the empirical 3D acquisition of Michelangelo's David, the laser scan-based 3D mapping of the tombs found in the Valley of the Kings and the decipherment of the instructions to and the operation of the 2nd-century BCE Antikythera Mechanism— arguably the first computer in human kind history.
A new generation of physics-based animation approaches are beginning to emerge that are robust and maintain a standard of visual quality as high as data-driven synthesis. And even with the holy grail of control princi...
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A new generation of physics-based animation approaches are beginning to emerge that are robust and maintain a standard of visual quality as high as data-driven synthesis. And even with the holy grail of control principles that describe human motion still a mystery, the animation research community continues to forge its own path. We've learned that we don't need to solve the problem of biological control, nor do we need to throw out the advantages of animator control and motion capture. Instead, current research aims to find the best of all worlds, judiciously combining physics with human-motion examples, animator input, or both. This special issue brings together four examples of the innovations in this exploding area.
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