Creation of 3d models from a single RGB image is challenging problem in image processing these days, as the technology is in its early development stage. However, the demands for 3d technology and3dreconstruction ha...
详细信息
Creation of 3d models from a single RGB image is challenging problem in image processing these days, as the technology is in its early development stage. However, the demands for 3d technology and3dreconstruction have been rapidly increasing nowadays. The traditional approach of computer graphics is to create a geometric model in 3d and try to reproduce it onto a 2d image with rendering. The major aim of the study is to create 3d models from 2d RGB image using machine learning techniques to be less computationally complex as compared to any deep learning algorithm. The proposed model has been based on three different modules such as: 2.5d features extraction, mesh generation, and3d boundary detection. The ShapeNet dataset has been used for comparison. The testing results has shown an accuracy of 90.77 % in the plane class, 85.72% in the chair class, and 72.14% in the automobile class. The proposed model could be applicable to problems where reconstruction of 3d models is required such as: variations in geometric scale, mix of textured, uniformly colored, and reflective surfaces.
In honour of the International Year of Sound and for the 1 year memorial of the Notre-dame cathedral fire, a team of researchers and sound engineers created a virtualreconstruction of a concert in the cathedral, usin...
详细信息
ISBN:
(纸本)9781665409988
In honour of the International Year of Sound and for the 1 year memorial of the Notre-dame cathedral fire, a team of researchers and sound engineers created a virtualreconstruction of a concert in the cathedral, using close-mic recordings made on 24-April-2013 of a performance of La Vierge by Jules Massenet. This reconstruction was carried out during the period of strict COVId-19 confinement. With 83 musicians, 6 singers and a 160-person choir spatially distributed throughout the cathedral, the original performance offered a spatial composition highlighting the complex acoustics and interactions between source and listener positions. Individual tracks were convolved with spatial room impulse responses, created from a calibrated geometrical acoustic simulation. Several listening positions were binaurally rendered, along with an artistic mix created by a sound engineer, offering a unique 3d-audio experience approaching the reality of the moment in the past. distributed on-line, the website presenting this virtualreconstruction has been visited from users around the world. A listener opinion survey was included on the website. This paper presents an overview of the source material, the production workflow, and the challenges of realising such a production during confinement. Finally, an overview of visitor statistics and survey results is presented, providing insight into the reception of the virtual recreation and the interest towards future productions.
This work presents a versatile digital holography software (HOLO4d) that provides an all-in-one solution for holographic reconstruction, simulation, de-twining and lens distortion removal in a user-friendly graphical ...
详细信息
ISBN:
(数字)9781510644731
ISBN:
(纸本)9781510644731
This work presents a versatile digital holography software (HOLO4d) that provides an all-in-one solution for holographic reconstruction, simulation, de-twining and lens distortion removal in a user-friendly graphical interface. The software accepts holograms for both, in-line and off-axes schemes with the option to locate and specify the cross-term in the latter case. Both amplitude and phase shifts are recovered from holograms generated by plane waves using multiple functionalities for propagation. These include the angular spectrum method, sinc-interpolation, upsampling-lowpass filter and zero-padding processes that can be applied in a variety of combinations to optimize holographic reconstructions. The virtual image that obscures the real image in these reconstructions is suppressed using a subtraction division plus mean (SdPM) normalization procedure or by iteratively updating the complex-valued wavefront in the detector plane. The use of lenses to manipulate the effective position of the hologram introduces optical distortions. These are removed by calibrating a dot-pattern hologram reconstruction in a step-by-step auto-detection procedure and mapping the distortion characteristics to the corresponding object hologram reconstruction. Hologram simulations enable determining the maximum field-of-view, fringes captured, and the lateral resolution possible based on the imaging sensor, illumination and setup specifications. The numerical package is used to process holograms of 80 mu m thick hair strands, scan the depth-of-field and locate the precise three-dimensional (3d) location of reconstructed objects. The results demonstrate the versatility of the software to reconstruct, de-twin, undistort and simulate holograms in a user-friendly manner and its applicability as a robust tool for 3dvisualization, education, and holographic research.
Anterior cruciate ligament (ACL) reconstruction is crucial for restoring knee joint stability, and its success rate is largely dependent on the precise positioning of the femoral tunnel. Traditional surgical methods r...
详细信息
ISBN:
(数字)9798350351514
ISBN:
(纸本)9798350351521
Anterior cruciate ligament (ACL) reconstruction is crucial for restoring knee joint stability, and its success rate is largely dependent on the precise positioning of the femoral tunnel. Traditional surgical methods rely on two-dimensional (2d) images, which are accompanied by low spatial resolution, lack of three-dimensional (3d) anatomical information, and poor visualization. Mixed reality (MR) technology, with its advantages of preoperative computed tomography (CT) reconstruction and anatomical position visualization, has shown substantial potential in enhancing surgical precision. This research designed a novel Mixed Reality Surgical Navigation System (MR-SNS) and evaluated its effectiveness in assisting femoral tunnel positioning in single-bundle ACL reconstruction. The results suggested that the MR group using MR-SNS demonstrated higher femoral tunnel positioning precision (F
$0.22\pm 0.16,0.66\pm 0.27$
), notably superior to the conventional group (
$2.57\pm 0.30$
and
$2.07\pm 0.34$
). MR also displayed positive effects in reducing the cognitive load on surgeons. This study supports the application of MR-SNS in orthopaedic surgery, providing scientific evidence for the development of MR in surgical navigation. With technological advancements and cost reductions, MR-SNS is expected to become an indispensable tool for orthopaedic surgeons in achieving precise surgeries.
There are many studies on 3dreconstruction based on monocular vision, but for complex surface parts, contour occlusion problems will occur, which requires binocular or multi-eye vision for 3dreconstruction. This pap...
详细信息
Non-contact inspection has dominated various industries for many years, particularly in the field of food and agricultural processes. Volume estimation can be achieved by volumetric imagery or 3dreconstruction. The c...
详细信息
ISBN:
(数字)9798350383027
ISBN:
(纸本)9798350383034
Non-contact inspection has dominated various industries for many years, particularly in the field of food and agricultural processes. Volume estimation can be achieved by volumetric imagery or 3dreconstruction. The casting of shadows or shape by shading is an active technique that can be utilized to generate volumetric imagery. By evaluating the length of shadows, the object height data can be achieved, and the transformation of image coordinates to world coordinates is facilitated by means of homography transformation. The width, length, and height of object edges along the entirety of its length are employed to reconstruct virtual slices. The integration of these virtual slices enables the estimation of the object's volume. This research studied the variation of the measuring locations, three different diameters spherical balls 38mm, 50mm, and 80mm are used as test materials. The percentage of errors in volume obtained from all sections by shadow casting were compared to computation volume of sphere formula is approximately -1.6 %, -1.13 %, and - 6.60%, respectively, depending on the size of the object. Furthermore, a visualization-based analysis is presented which has no significant difference. From this studied, it can be concluded that this method is valuable in estimating the volume of axially symmetrical objects.
Background: Managing segmental mandibular defects remains challenging, requiring a multidisciplinary approach despite the remarkable progress in mandibular reconstruction plates, finite element methods, computer-aided...
详细信息
Background: Managing segmental mandibular defects remains challenging, requiring a multidisciplinary approach despite the remarkable progress in mandibular reconstruction plates, finite element methods, computer-aideddesign and manufacturing techniques, and novel surgical procedures. complex surgeries require a comprehensive approach, as using only reconstruction plates or tissue scaffolds may not be adequate for optimal results. The limitations of the treatment options should be investigated towards a patient-specific trend to provide shorter surgery time, better healing, and lower costs. Integrated hybrid scaffold systems are promising in improving mechanical properties and facilitating healing. By combining different materials and structures, hybrid scaffolds can provide enhanced support and stability to the tissue regeneration process, leading to better patient outcomes. The use of such systems represents a significant advancement in tissue engineering and a wide range of medical procedures. Materials and Methods: A head and neck computed tomography (CT) data of a patient with odontogenic myxoma was used for creating a three-dimensional (3d) mandible model. virtual osteotomies were performed to create a segmental defect model, including the angulus mandibulae region. The first mandibular reconstruction plate was designed. Finite elemental analyses (FEA) and topology optimizations were performed to create two different reconstruction plates for different treatment scenarios. The FEA were performed for the resulting two plates to assess their biomechanical performance. To provide osteoconductive and osteoinductive properties a scaffold was designed using the defect area. A biomimetic Tricalcium phosphate-Polycaprolactone (TCP-PCL) hybrid bone scaffold enhanced with Hyaluronic aciddipping was manufactured. Results: The results of the in-silico analysis indicate that the designedreconstruction plates possess robust biomechanical performance anddemonstrate remark
In order to enhance the 3dvisualization of art images, this paper studies the 3d visual enhancement of fashion art images based on image virtual reality technology. The 3d feature detection anddata acquisition of vi...
In order to enhance the 3dvisualization of art images, this paper studies the 3d visual enhancement of fashion art images based on image virtual reality technology. The 3d feature detection anddata acquisition of virtual scene are realized by the method of dark channel color scene parameter acquisition and information fusion. The distributed parameter model of fashion art image is established, the virtual reality scene of fashion art image is reconstructed, and the 3d filtering and feature analysis model is established. Feature analysis and RGB pixel reorganization are carried out by image information enhancement and parameter feedback compensation. Through exposure fusion and white balance control, the stereo visual enhancement of fashion art image is realized. The simulation results show that the research improves the reconstruction and recognition ability of fashion style art images, and the three-dimensional expression ability of art images is better, and the scene fidelity is higher.
reconstruction of 3d images is always a challenging task for the research community and scientist because 3d image reconstructiondescribes the quantitative characteristics of the objects i.e., shape, size, texture, a...
详细信息
This paper examines the use of both flow control and passive low noise technologies to reduce the aerodynamic noise radiated from a modified LAGOON landing gear, as tested in the EU funded H2020 collaborative research...
详细信息
ISBN:
(数字)9781624106644
ISBN:
(纸本)9781624106644
This paper examines the use of both flow control and passive low noise technologies to reduce the aerodynamic noise radiated from a modified LAGOON landing gear, as tested in the EU funded H2020 collaborative research project: INVENTOR, InnoVative dEsign of iNstalled airframe componenTs for aircraft nOise Reduction. At approach to landing, landing gear noise is still a significant contributor to environmental noise in the vicinity of airports. Progress is being made with ambitious projects which aim to develop significantly reconfigured aircraft architectures to reduce airframe noise. The current project examines noise abatement measures which could be retrofit to existing landing gear configurations. Flow control in the form of low TRL "air curtains" which form a fluidic shield or virtual fairing are examined. Amongst the most interesting passive solutions are a selection of higher TRL porous materials in the form of wire mesh, perforated plates and3d materials. In order to provide a simplified baseline landing gear mock-up on which to test the low noise technologies, the LAGOON NLG is modified with the addition of a torque-link and brakes and is called the "LAGOON-SLG". The porous materials are assessed experimentally in the A-Tunnel aeroacoustic facility in TU delft, the Netherlands and the air curtains are examined in dLRs AWB aeroacoustic facility in Braunschweig, Germany.
暂无评论