Directional estimation is a common problem in many tracking applications. Traditional filters such as the Kalman filter perform poorly in a directional setting because they fail to take the periodic nature of the prob...
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ISBN:
(纸本)9781479902842
Directional estimation is a common problem in many tracking applications. Traditional filters such as the Kalman filter perform poorly in a directional setting because they fail to take the periodic nature of the problem into account. We present a recursive filter for directional data based on the Bingham distribution in two dimensions. The proposed filter can be applied to circular filtering problems with 180 degree symmetry, i.e., rotations by 180 degrees cannot be distinguished. It is easily implemented using standard numerical techniques and is suitable for real-time applications. The presented approach is extensible to quaternions, which allow tracking arbitrary three-dimensional orientations. We evaluate our filter in a challenging scenario and compare it to a traditional Kalman filtering approach.
This paper presents a novel framework for efficiently propagating the stroke-based user edits to the regions with similar colors and locations in high resolution images and videos. Our framework is based on the key ob...
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In the decade of data explosion, a significant challenge is how to transform data into understandings and insights that are useful to people. Visualization, the use of computer-supported, interactive visual representa...
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In the decade of data explosion, a significant challenge is how to transform data into understandings and insights that are useful to people. Visualization, the use of computer-supported, interactive visual representations of data to amplify cognition, is an important approach to addressing this challenge. In particular, scientific visualization primarily represents physical or geometric data while information visualization mainly represents abstract data such as text documents, graphs, and multidimensional data. Visual analytics, springing out of the fields of information visualization and scientific visualization,
Engineered nanoparticles have gained importance in recent years and will do so in the future, but their potential toxicity remains an open question. To better understand their effects on the human body, it is necessar...
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The interaction with 3D scenes is an essential requirement of computer applications ranging from engineering and entertainment to architecture and social networks. Traditionally 3D scenes are rendered by projecting th...
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ISBN:
(纸本)9781921770074
The interaction with 3D scenes is an essential requirement of computer applications ranging from engineering and entertainment to architecture and social networks. Traditionally 3D scenes are rendered by projecting them onto a 2-dimensional surface such as a monitor or projector screen. This process results in the loss of several depth cues important for immersion into the scene. An improved 3D perception can be achieved by using immersive Virtual Reality equipment or modern 3D display devices. However, most of these devices are expensive and many 3D applications, such as modelling and animation tools, do not produce the output necessary for these devices. In this paper we explore the use of cheap consumer-level hardware to simulate 3D displays. We present technologies for adding stereoscopic 3D and motion parallax to 3D applications, without having to modify the source code. The developed algorithms work with any program that uses the OpenGL fixed-function pipeline. We have successfully applied the technique to the popular 3D modelling tool Blender. Our user tests show that stereoscopic 3D improves user's perception of depth in a virtual 3D environment more than head coupled perspective. However, the latter is perceived as more comfortable. A combination of both techniques achieves the best 3D perception, and has a similar comfort rating as stereoscopic 3D.
CMOS imagers are complex systems whose design requires quite different pieces of expertise, namely: pixels, analog signal processing, pixel readout and analog-to-digital conversion, digital signal processing, output d...
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CMOS imagers are complex systems whose design requires quite different pieces of expertise, namely: pixels, analog signal processing, pixel readout and analog-to-digital conversion, digital signal processing, output drivers, etc. Confronting the design of new imagers require hence the concourse of multidisciplinary teams. However, because correct operation calls for the close interconnection among the different parts, global knowledge is mandatory for successful design. This is particularly pertinent for the newer generations of smart imagers required for high-end applications and/or requiring ultra-high image capture, on-chip image correction, scene interpretation, high dynamic range capture, etc. All these features demand architectural and circuital innovations and pose significant challenges to designers. Also, the increased interest on sensors capable of capturing 3-D scenes raise new challenges at circuit level related to the necessity to interface pixels different from those employed for 2-D capture, on the one hand, and to extract and convert to digital domain time information, on the other hand. This tutorial addresses the design of smart CMOS imagers by following a comprehensive and complete top-down approach where each subsystem is contemplated and described as a part of a whole. Starting the formulation of the performance metrics used to specify and characterize imagers, the tutorial explains how the subsystem behavior and non-idealities impact on the global imager metrics, thereby setting the basis to specify the subsystems for given global image sensor specs. Such methodology is illustrated in the tutorial via a dedicated, MATLAB-based modeling tool which will be employed to allow the attendees gaining insight on the impact of non-ideal sub-systems behaviors. The tutorial overviews the state-of-the-art regarding: pixels; analog signal processing and read-out circuitry; data conversion circuitry, covering both amplitude data converters (required for 2-D
The research on facial animation has grown very fast and become more realistic in term of 3D facial data since the laser scan and advance 3D tools can support creating complex facial model. However, that approaches st...
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Failure bitmaps of manufactured memory arrays may contain the information associated to some systematic defects and have hence been used to monitor the process and improve the memory yield. It is very important to dev...
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