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Real Time 3d Reconstruction And Rendering For Minimally Invasive Surgery With Multi Cameras Array
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Book Synopsis Real-time 3D Reconstruction and Rendering for Minimally Invasive Surgery with Multi Cameras Array by : Jianwei Ke
Download or read book Real-time 3D Reconstruction and Rendering for Minimally Invasive Surgery with Multi Cameras Array written by Jianwei Ke and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advancements in digital camera technologies have led to significantly smaller camera sensors without compromising imaging quality. This trend opens avenues for replacing single-camera systems with multi-camera arrays, offering benefits such as an expanded field-of-view and 3D information. However, camera arrays require additional processing to interpret the collected image data. This report addresses two significant algorithmic challenges in developing a camera array. The first challenge involves virtual view generation, which is the task of estimating the image for a virtual camera using image data from multiview cameras. Ideally, if the geometry of the underlying scene is known, the virtual view can be generated by projecting the 3D geometry to the virtual camera. However, finding the 3D geometry of a scene from multiview cameras is an active research topic in Computer Vision. Considering the real-time processing requirement (
Book Synopsis Interactive Focus of Light Fields for 3D Displays by : Karen A. Lin
Download or read book Interactive Focus of Light Fields for 3D Displays written by Karen A. Lin and published by . This book was released on 2007 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: We desire to render scenes onto 3D displays for realtime applications based on image data, targeting media such as streaming multi-view video. The conventional method for rendering would be to first perform 3D reconstruction of the image data, then render the 3D geometric and texture data. However, this approach would be too slow and would lack robustness for complex scenes. Instead, we take an image based approach by using appropriate filtering. Our approach interpolates limited light field data of a 3D scene to simulate depth of field, so that we are able to render new stereo pair views from camera array data in realtime. This allows users to roam in front of a 3D display and still experience seamless natural viewing. We produce these images by convolving 2D image data with an elliptical Gaussian. By shearing the line-like Gaussian to minimize variance over an area-of-interest, the application determines the depth of a user designated pixel. This lets users change focus in realtime, so that their vision does not feel inhibited by the shallower focal depth. Instead, they are able to better focus on the details of their current interest. Our method can be combined with eye trackers and video data for minimally invasive surgery, video conferencing, or any other remote controlled interactive visual applications for enhanced realistic viewing experience.
Book Synopsis A Framework for Realtime 3-D Reconstruction by Space Carving Using Graphics Hardware by : Christian Nitschke
Download or read book A Framework for Realtime 3-D Reconstruction by Space Carving Using Graphics Hardware written by Christian Nitschke and published by diplom.de. This book was released on 2007-03-05 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inhaltsangabe:Introduction: Reconstruction of real-world scenes from a set of multiple images is a topic in Computer Vision and 3D Computer Graphics with many interesting applications. There is a relation to Augmented and Mixed Reality (AR/MR), Computer-Supported Collaborative Work (CSCW), Computer-Aided industrial/architectural Design (CAD), modeling of the real-world (e.g. computer games, scenes/effects in movies), entertainment (e.g. 3D TV/Video) and recognition/analyzing of real-world characteristics by computer systems and robots. There exists a powerful algorithm theory for shape reconstruction from arbitrary viewpoints, called shape from photo-consistency. However, it is computationally expensive and hence can not be used with applications in the field of 3D video or CSCW as well as interactive 3D model creation. Attempts have been made to achieve real-time framerates using PC cluster systems. While these provide enough performance they are also expensive and less flexible. Approaches that use GPU hardware-acceleration on single workstations achieve interactive framerates for novel-view synthesis, but do not provide an explicit volumetric representation of the whole scene. The proposed approach shows the efforts in developing a GPU hardware-accelerated framework for obtaining the volumetric photo hull of a dynamic 3D scene as seen from multiple calibrated cameras. High performance is achieved by employing a shape from silhouette technique in advance to obtain a tight initial volume for shape from photo-consistency. Also several speed-up techniques are presented to increase efficiency. Since the entire processing is done on a single PC, the framework can be applied to mobile setups, enabling a wide range of further applications. The approach is explained using programmable vertex and fragment processors and compared to highly optimized CPU implementations. It is shown that the new approach can outperform the latter by more than one magnitude. The thesis is organized as follows: Chapter 1 contains an introduction, giving an overview with classification of related techniques, statement of the main problem, novelty of the proposed approach and its fields of application. Chapter 2 surveys related work in the area of dynamic scene reconstruction by shape from silhouette and shape from photo-consistency. The focus lies on high performance reconstruction and hardware-acceleration. Chapter 3 introduces the theoretical basis for the proposed [...]
Book Synopsis Visual SLAM And Surface Reconstruction For Abdominal Minimally Invasive Surgery by : Bingxiong Lin
Download or read book Visual SLAM And Surface Reconstruction For Abdominal Minimally Invasive Surgery written by Bingxiong Lin and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Depth information of tissue surfaces and laparoscope poses are crucial for accurate surgical guidance and navigation in Computer Assisted Surgeries (CAS). Intra-operative Three Dimensional (3D) reconstruction and laparoscope localization are therefore two fundamental tasks in CAS. This dissertation focuses on the abdominal Minimally Invasive Surgeries (MIS) and presents laparoscopic-video-based methods for these two tasks. Different kinds of methods have been presented to recover 3D surface structures of surgical scenes in MIS. Those methods are mainly based on laser, structured light, time-of-flight cameras, and video cameras. Among them, laparoscopic-video-based surface reconstruction techniques have many significant advantages. Specifically, they are non-invasive, provide intra-operative information, and do not introduce extra-hardware to the current surgical platform. On the other side, laparoscopic-video-based 3D reconstruction and laparoscope localization are challenging tasks due to the specialties of the abdominal imaging environment. The well-known difficulties include: low texture, homogeneous areas, tissue deformations, and so on. The goal of this dissertation is to design novel 3D reconstruction and laparoscope localization methods and overcome those challenges from the abdominal imaging environment. Two novel methods are proposed to achieve accurate 3D reconstruction for MIS. The first method is based on the detection of distinctive image features, which is difficult in MIS images due to the low-texture and homogeneous tissue surfaces. To overcome this problem, this dissertation first introduces new types of image features for MIS images based on blood vessels on tissue surfaces and designs novel methods to efficiently detect them. After vessel features have been detected, novel methods are presented to match them in stereo images and 3D vessels can be recovered for each frame.
Book Synopsis 3D Reconstruction by : Christian Nitschke
Download or read book 3D Reconstruction written by Christian Nitschke and published by VDM Publishing. This book was released on 2007 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our environment is more and more shaped by the influence of digital media which itself evolves at tremendous pace. A small example: 15 years ago, offthe- shelf computers were only able to cope with flat 2D graphics. Improvements in system design made it possible to process 3D scenes, leading to a powerful contribution to our everyday life. However, such scenes need to be created by experienced artists employing difficult and expensive tools. The increasing demand for realism makes things not easier. At the same time, the rapid improvement of commodity hardware enables the development of low cost systems for 3D photography. How can systems for volumetric scene reconstruction be efficiently designed? How may high quality be combined with real-time processing? And how is it possible to create a lightweight architecture using a single computer? After presenting an introductory overview and sketching a novel approach to scene reconstruction, the author Christian Nitschke gives a survey of related work in high-performance reconstruction by shape from silhouette and shape from photo-consistency. To convey a profound understanding to the reader he explains the fundamentals of scene and camera geometry, image formation, light and color as well as 3D reconstruction from multiple views. The novel approach is then introduced in two steps by mapping a basic algorithm to an advanced algorithm using graphics hardware acceleration. Performance and quality issues are analyzed and discussed in detail. The book aims at software and system engineers, scientists and researchers, technical directors as well as the interested public.
Book Synopsis Real-time 3D reconstruction using multiple depth cameras by : Marco Diaz Lopez
Download or read book Real-time 3D reconstruction using multiple depth cameras written by Marco Diaz Lopez and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-view 3D Reconstruction Using Virtual Cameras by : Marc Racicot
Download or read book Multi-view 3D Reconstruction Using Virtual Cameras written by Marc Racicot and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Real Time 3D Reconstruction of Non-structured Domestic Environment for Obstacle Avoidance Using Multiple RGB-D Cameras by : Jordi Magdaleno Maltas
Download or read book Real Time 3D Reconstruction of Non-structured Domestic Environment for Obstacle Avoidance Using Multiple RGB-D Cameras written by Jordi Magdaleno Maltas and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents how to obtain a real-time 3D reconstruction of a non-structured scene using multiple RGB-D cameras with the aim to use it for robot planning. Several techniques have been developed, starting from raycasting. In order to obtain better speeds some point filtering procedures have been used. Finally, a temporal filtering technique is used to replace the raycasting approach, and to provide a better reconstruction, a sparse points filter is implemented.
Book Synopsis 3D Reconstruction from Stereo and Photometric Cues in Minimally Invasive Surgery by : Marco Visentini Scarzanella
Download or read book 3D Reconstruction from Stereo and Photometric Cues in Minimally Invasive Surgery written by Marco Visentini Scarzanella and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last decade, an increasing number of advanced platforms for robotic assisted Minimally Invasive Surgery (MIS) have been translated from research concepts to practical systems used in routine clinical settings. Such systems have defined their own niche in the market place and are gaining increasing acceptance by the surgical community. More importantly, they improve surgeons' dexterity and intra-operative visualisation together with the benefits of improved procedural time, safety, consistency and patient outcome. Some of the new technical features integrated within current robotic systems include higher degrees of freedom for more agile manoeuvring, tremor filtering and haptic feedback. Where the next frontier lies in terms of novel means of surgical assistance is in navigation systems that would enable intra-operative surgical guidance, imposing dynamic active constraints and high fidelity augmented reality environments. At the foundation of all navigation systems lies an accurate 3D reconstruction algorithm. To overcome the current limitations of feature-based matching and reconstruction systems, this thesis investigates a method to integrate depth information from conventional stereo 3D reconstruction with photometric cues from Shape-from-Shading techniques. This is further enhanced with a gaze-contingent framework suitable for intra-operative nav- igation during MIS. The resulting system is suitable for applications with existing MIS platforms without the need of additional hardware, ensuring increased accuracy in areas without salient anatomical landmarks or artificially introduced fiducials. Furthermore, a multi-scale feature detector is proposed for intra-operative stereo telestration required for telementoring and remote collaboration of robotic assisted MIS. An improved formulation of the current state-of-the- art in Shape-from-Shading is integrated with intra-operative scenes for accurate metric depth recovery. The potential clinical application of the technique is demonstrated for autonomous navigation of wireless capsule endoscopes. Future research directions and preliminary results of integrating photometric stereo constraints for reliable reconstruction of featureless, non- Lambertian deforming tissue surfaces are provided and all methods proposed have been validated with either in vivo or phantom experiments to justify their potential clinical values in MIS.
Book Synopsis Real-time Multi-view 3D Reconstruction for Interventional Environments by : Stawros Ladikos
Download or read book Real-time Multi-view 3D Reconstruction for Interventional Environments written by Stawros Ladikos and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Automated Real-time 3D Reconstruction for Indoor Environments Using Monocular Vision by : Samir Shaker
Download or read book Automated Real-time 3D Reconstruction for Indoor Environments Using Monocular Vision written by Samir Shaker and published by . This book was released on 2010 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional maps are useful in various applications: from games, to augmented reality, to the development of tour guides of important landmarks such as museums or university campuses. The manual creation of such maps is labor intensive and has therefore justified its automation using robots with range sensors such as lasers or robots with cameras. This thesis presents an automated 3D reconstruction system for indoor environments using only one camera on a mobile robot with an algorithm that runs in real-time. It relies on a vision-based Occupancy Grid SLAM (Simultaneous Localization and Mapping) to detect the ground. The novelty of this work is the method in which 3D information is extracted and fed to SLAM. The ground is first detected by fitting planes to salient features in image segments and by determining the height and orientation of those planes. Then on the height of the ground, 3D virtual rays are cast in a multitude of angles starting from the camera center until they reach the edges of the ground segments in the image. Detection of the ground boundaries is done by continually reprojecting each ray from the 3D world to the 2D image plane. Dense depth information can then be suggested from these rays and input to SLAM. Edge detection and line fitting is then used on the SLAM map to extend walls from those edges until they reach the ceiling. The system produces good quality maps and reduces the high computational cost of dense stereo matching by processing only a sparse set of salient features in real-time. Extensive experiments are conducted inside a lab setting and results prove the success of the system.
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 3D Image Processing by : D. Caramella
Download or read book 3D Image Processing written by D. Caramella and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few fields have witnessed such impressive advances as the application of computer technology to radiology. The progress achieved has revolutionized diagnosis and greatly facilitated treatment selection and accurate planning of procedures. This book, written by leading experts from many different countries, provides a comprehensive and up-to-date overview of the role of 3D image processing. The first section covers a wide range of technical aspects in an informative way. This is followed by the main section, in which the principal clinical applications are described and discussed in depth. To complete the picture, the final section focuses on recent developments in functional imaging and computer-aided surgery. This book will prove invaluable to all who have an interest in this complex but vitally important field.
Book Synopsis Visualization in Medicine by : Bernhard Preim
Download or read book Visualization in Medicine written by Bernhard Preim and published by Elsevier. This book was released on 2007-06-21 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: Visualization in Medicine is the first book on visualization and its application to problems in medical diagnosis, education, and treatment. The book describes the algorithms, the applications and their validation (how reliable are the results?), and the clinical evaluation of the applications (are the techniques useful?). It discusses visualization techniques from research literature as well as the compromises required to solve practical clinical problems. The book covers image acquisition, image analysis, and interaction techniques designed to explore and analyze the data. The final chapter shows how visualization is used for planning liver surgery, one of the most demanding surgical disciplines. The book is based on several years of the authors' teaching and research experience. Both authors have initiated and lead a variety of interdisciplinary projects involving computer scientists and medical doctors, primarily radiologists and surgeons.* A core field of visualization and graphics missing a dedicated book until now* Written by pioneers in the field and illustrated in full color* Covers theory as well as practice
Download or read book Index Medicus written by and published by . This book was released on 2003 with total page 1972 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Download or read book Science Abstracts written by and published by . This book was released on 1995 with total page 1360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1994 with total page 1496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
