Direction Hole-Filling Method for a 3D View Generator

[[abstract]]Depth image-based rendering (DIBR) technology is an approach to creating a virtual 3D image from one single 2D image. A desired view can be synthesised at the receiver side using depth images to make transmission and storage efficient. While this technique has many advantages, one of the key challenges is how to fill the holes caused by disocclusion regions and wrong depth values in the warped left/right images. A common means to alleviate the sizes and the number of holes is to smooth the depth image. But smoothing results in geometric distortions and degrades the depth image quality. This study proposes a hole-filling method based on the oriented texture direction. Parallax correction is first implemented to mitigate the wrong depth values. Texture directional information is then probed in the background pixels where holes take place after warping. Next, in the warped image, holes are filled according to their directions. Experimental results showed that this algorithm preserves the depth information and greatly reduces the amount of geometric distortion.[[notice]]補正完

An Improved Depth Image Inpainting

[[abstract]]In recent years, the price of depth camera became low, so that researchers can use depth camera to do more application. For computer vision, depth images can provide more useful information. However, generally there are some problems in depth image, such as holes, incomplete edge, and temporal random fluctuations. Conventional inpainting approach must rely on color image and it cannot be processed in real time. Therefore, this paper proposes a real time depth image inpainting method. First, we use background subtraction and mask filter to patch up the no-measured pixels, and then using the relationship between successive depth images to remove temporal random fluctuations. Finally, using erosion and dilation smooth the edge. Experimental results outperform than traditional one.[[sponsorship]]Asia-Pacific Education & Research Association[[conferencetype]]國際[[conferencedate]]20140711~20140713[[booktype]]紙本[[iscallforpapers]]Y[[conferencelocation]]普吉島, 泰

Computer analysis of cardiac radionuclide data

Gamma-camera tomography gives uniform in-plane and cross-plane resolution with propagation of the defect from one plane to another determined only by the usual camera-collimator resolution. These images may be reformatted by computer to portray slices in any orientation. Cross plane resolution is slightly worse than for the other methods, but it is uniform. The efficiency is less than either quadrant slant hole or seven pinhole apertures. Rotating cameras are not portable nor can they be used for dynamic studies.Both slant hole collimators and seven pinhole apertures distort the object in the depth dimension because of the limited viewing angle. The slant hole geometry provides somewhat better sampling and less plane-to-plane cross talk especially for the more distant planes. The full width half maximum of the depth response is not a sensitive indicator of this problem because the depth response function has very long tails.To date, best overall performance of the limited angle methods is offered by the 40[deg] slant hole collimator on a large field-of-view camera. This, however, is not a portable unit and has a field-of-view too small for about 10% of the patients.Seven pinhole imaging offers the advantage of having been well studied by a number of institution.87-90 A large pool of normal patient studies exists and the performance is well documented. Although the seven pinhole alone is suited to dynamic studies, any of the methods may be adapted to multigated studies.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/25165/1/0000603.pd

National Geodetic Satellite Program, Part II: A Report Compiled and Edited for NASA by the AGU

The work performed by individual contributors to the National Geodetic Satellite Program is presented. The purpose of the specific organization, the instruments used in obtaining the data, a description of the data itself, the theory used in processing the data, and evaluation of the results are detailed for each participating organization. An overall evaluation of the entire program is given

Nongeometric Distortion Smoothing Approach for Depth Map Preprocessing

[[abstract]]Depth image-based rendering (DIBR) is a process that uses one 2-D color image and its associated depth map to render virtual view 3-D images. One of the main problems in DIBR is how to reduce holes that occur on the generated virtual view images. In general, preprocessing the whole depth image by smoothing filter before image warping can reduce the hole occurrence. However, smoothing the whole depth image not only produces some geometric distortions on the generated virtual directional images, but also increases computation time. This paper proposes an adaptive edge-oriented smoothing process to solve the above problem, in which the adaptive smoothing filter for the depth map is determined by the characteristics of the hole region with or without vertical lines in the color image. The adaptive smoothing filter contains two types: the asymmetric smoothing filter is used to reduce the geometric distortions by smoothing the hole regions with vertical lines that belong to the background; and the horizontal smoothing filter is used to reduce hole occurrence and computation time by smoothing the hole regions without vertical lines. The experiment results show that the proposed method turns out to be a good tradeoff between time saving, hole reduction rate, and virtual view quality.[[note]]SC

Remote Sensing of Earth Resources: A literature survey with indexes (1970 - 1973 supplement). Section 1: Abstracts

Abstracts of reports, articles, and other documents introduced into the NASA scientific and technical information system between March 1970 and December 1973 are presented in the following areas: agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, oceanography and marine resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis

Nongeometric Distortion Smoothing Approach for Depth Map Preprocessing

[[abstract]]Depth image-based rendering (DIBR) is a process that uses one 2-D color image and its associated depth map to render virtual view 3-D images. One of the main problems in DIBR is how to reduce holes that occur on the generated virtual view images. In general, preprocessing the whole depth image by smoothing filter before image warping can reduce the hole occurrence. However, smoothing the whole depth image not only produces some geometric distortions on the generated virtual directional images, but also increases computation time. This paper proposes an adaptive edge-oriented smoothing process to solve the above problem, in which the adaptive smoothing filter for the depth map is determined by the characteristics of the hole region with or without vertical lines in the color image. The adaptive smoothing filter contains two types: the asymmetric smoothing filter is used to reduce the geometric distortions by smoothing the hole regions with vertical lines that belong to the background; and the horizontal smoothing filter is used to reduce hole occurrence and computation time by smoothing the hole regions without vertical lines. The experiment results show that the proposed method turns out to be a good tradeoff between time saving, hole reduction rate, and virtual view quality.[[note]]SC

Aeronautical engineering: A continuing bibliography with indexes (supplement 292)

This bibliography lists 675 reports, articles, and other documents recently introduced into the NASA scientific and technical information system database. Subject coverage includes the following: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment, and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics