We analyze the luminance uniformity and color uniformity of the color volumetric 3D display system based on a rotating LED screen. We first analyze the luminance and chromatic coordinate distribution for one RGB cube ...
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Current active 3D range sensors, such as time-of-flight cameras, enable acquiring of range maps at video frame rate. Unfortunately, the resolution of the range maps is quite limited and the captured data are typically...
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Current active 3D range sensors, such as time-of-flight cameras, enable acquiring of range maps at video frame rate. Unfortunately, the resolution of the range maps is quite limited and the captured data are typically contaminated by noise. We therefore present a simple pipeline to enhance the quality as well as improve the spatial and depth resolution of range data in real time by up sampling the depth information with the data from high resolution video camera and utilizing a new strategy to increase the sub-pixel accuracy. Our algorithm can greatly improve the reconstruction quality, boost the resolution of the range data to that of video sensor while achieving high computational efficiency for a real-time application.
Constraint is an important aspect of role based access control and is sometimes argued to be the principal motivation for role based access control (RBAC). But so far few authors have discussed consistency maintenance...
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Constraint is an important aspect of role based access control and is sometimes argued to be the principal motivation for role based access control (RBAC). But so far few authors have discussed consistency maintenance for constraint in RBAC model. Based on researches of constraints among roles and types of inconsistency among constraints, this paper introduces corresponding formal rules, rule based reasoning and corresponding methods to detect, avoid and resolve these inconsistencies. Finally, the paper introduces briefly the application of consistency maintenance in ZD PDM, an enterprise oriented product data management (PDM) system.
Providing a wider movement range of virtual camera is an unsolved problem for state-of-the-art image-based rendering system. In this paper, we present a new image based rendering technology called panoramic mosaics of...
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Providing a wider movement range of virtual camera is an unsolved problem for state-of-the-art image-based rendering system. In this paper, we present a new image based rendering technology called panoramic mosaics of slit images with depth that can provide large virtual camera motion region for some scenes. By limiting camera motion to a horizontal plane only, a slit image with united depth value is used as the rendering element. The panoramic mosaics of slit images with depth are easy to capture, and the data size is as small as that of panorama. We present here the capturing, construction as well as rendering process of panoramic slit images mosaic with depth. In addition, we present the join up process of multiple panoramic slit images mosaic with depth.
A shading model which accounts for both diffuse reflection and specular reflection caused by any ideal diffuse polygonal light sources is derived. The diffuse reflection component is accurately represented in an analy...
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A shading model which accounts for both diffuse reflection and specular reflection caused by any ideal diffuse polygonal light sources is derived. The diffuse reflection component is accurately represented in an analytic form, while the specular reflection component is represented by an area integration taking Phong’s specular model as the kernel. To simplify the evaluation of the specular term, we adopt Taylor’s series to approximate the integration. The analytic representations-of both terms involve no complex coordinate transformation and the images generated by the method are very realistic. Finally, a shadow detection algorithm is presented for the polygonal environment. .The precise umbra and penumbra can be produced. Results show great potential of our method.
An efficient coding method based on wavelet transform is presented for color *** tristimulus signals R,G,B of the original images are first converted into the Y,I,Q signals,whichare then decomposed into the luminance ...
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An efficient coding method based on wavelet transform is presented for color *** tristimulus signals R,G,B of the original images are first converted into the Y,I,Q signals,whichare then decomposed into the luminance and edge subimages with the wavelet ***,the edgesubimages are encoded with edge pattern vector quantization while the cosine transform coding method isused to encode the luminance *** results are obtained for coding of color images in thebitrate range from 0.24 to 0.50 bits/***,because of the simplicity of the structure in ourmethod,it is suitable for hardware implementation,and can be used in real time encoding system.
A generalized radiosity method based on the theory of light energy transfer between two differentialdiffuse surface areas is *** the conventional one,our method assumes radiosity tobe variable with each surface *** li...
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A generalized radiosity method based on the theory of light energy transfer between two differentialdiffuse surface areas is *** the conventional one,our method assumes radiosity tobe variable with each surface *** limiting the unknowns to radiosities of differential surface areaslocated at all vertices of surface patches,we have established a complete set of approximated *** generalized radiosity equation has been extended to non-diffuse *** and experimental results demonstrate the great potential of this method.
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