71 |
Video sculpture:spatio-temporal warpingGroves, Jeff David 30 September 2004 (has links)
In this thesis the concept behind our notion of video sculpture is to imagine an image sequence or movie as a three dimensional volume. We then also imagine that there is a frameset that traverses the image sequence to give us what we commonly think of as a video or movie. In the ordinary sense this frameset moves through an image sequence in a completely timeparallel linear fashion. In video sculpture, we free the frameset from these bounds so that we can sample space and time in completely unorthodox ways. We can view the whenwhere in previously unforeseen perspectives. Slices of the video environment can simultaneously reveal both past and future actions within a single frame.
Building on this free representation of video spacetime, we then wrest the frame once more from the present constraints of topography and/or topology. The frame can bend and twist and jump and dive. The view of a fading quadratic surface cutting through two scenes makes for a beautiful curtain transition. We present a framework and an implementation for modeling the frame as it passes through the image sequence volume object.
|
72 |
Steganalysis of video sequences using collusion sensitivityBudhia, Udit 16 August 2006 (has links)
In this thesis we present an effective steganalysis technique for digital video sequences
based on the collusion attack. Steganalysis is the process of detecting with a high probability
the presence of covert data in multimedia. Existing algorithms for steganalysis target
detecting covert information in still images. When applied directly to video sequences
these approaches are suboptimal. In this thesis we present methods that overcome this
limitation by using redundant information present in the temporal domain to detect covert
messages in the form of Gaussian watermarks. In particular we target the spread spectrum
steganography method because of its widespread use. Our gains are achieved by exploiting
the collusion attack that has recently been studied in the field of digital video watermarking
and more sophisticated pattern recognition tools. Through analysis and simulations we,
evaluate the effectiveness of the video steganalysis method based on averaging based collusion
scheme. Other forms of collusion attack in the form of weighted linear collusion and
block-based collusion schemes have been proposed to improve the detection performance.
The proposed steganalsyis methods were successful in detecting hidden watermarks
bearing low SNR with high accuracy. The simulation results also show the improved performance
of the proposed temporal based methods over the spatial methods. We conclude
that the essence of future video steganalysis techniques lies in the exploitation of the temporal
redundancy.
|
73 |
Computer/video games as a play therapy tool in reducing emotional disturbances in childrenHull, Kevin Boyd. January 2009 (has links)
Thesis (Ph.D.)--Liberty University, 2009. / Includes bibliographical references.
|
74 |
Digital video segmentation and annotation in news programsWang, Yang, January 2001 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 130-133).
|
75 |
Real-time video postprocessing algorithms and metrics /Gao, Wenfeng, January 2003 (has links)
Thesis (Ph. D.)--University of Washington, 2003. / Vita. Includes bibliographical references (leaves 94-103).
|
76 |
Performance modeling and evaluation of digital video over wireless networks /Zhao, Jian. January 2003 (has links)
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003. / Vita. Includes bibliographical references (leaves 149-160). Also available in electronic version. Access restricted to campus users.
|
77 |
On predictive coded video : facilitating VCR functionality and error recovery /Yang, Ruiduo. January 2003 (has links)
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003. / Includes bibliographical references (leaves 63-68). Also available in electronic version. Access restricted to campus users.
|
78 |
Real-Time Management of Videos for UAS Telemetry SystemSong, Jian, Luo, Ni 10 1900 (has links)
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA / Airborne videos are crucial for monitoring unmanned aircraft systems (UAS). However, the number of videos that could be sent to ground is limited due to the bandwidth of a telemetry system. An architecture of airborne video acquirement system with real-time management is present in this paper. In addition to acquire videos and other data like control commands, that architecture make it possible to manage and switch the videos to be transferred to the ground through telemetry channels for ground real-time monitoring and controlling.
|
79 |
Automated Lecture Video Segmentation: Facilitate Content Browsing and RetrievalLin, Ming January 2006 (has links)
People often have difficulties finding specific information in video because of its linear and unstructured nature. Segmenting long videos into small clips by topics and providing browsing and search functionalities is beneficial for information searching. However, manual segmentation is labor intensive and existing automated segmentation methods are not effective for plenty of amateur made and unedited lecture videos. The objectives of this dissertation are to develop 1) automated segmentation algorithms to extract the topic structure of a lecture video, and 2) retrieval algorithms to identify the relevant video segments for user queries.Based on an extensive literature review, existing segmentation features and approaches are summarized and research challenges and questions are presented. Manual segmentation studies are conducted to understand the content structure of a lecture video and a set of potential segmentation features and methods are extracted to facilitate the design of automated segmentation approaches. Two static algorithms are developed to segment a lecture video into a list of topics. Features from multimodalities and various knowledge sources (e.g. electronic slides) are used in the segmentation algorithms. A dynamic segmentation method is also developed to retrieve relevant video segments of appropriate sizes based on the questions asked by users. A series of evaluation studies are conducted and results are presented to demonstrate the effectiveness and usefulness of the automated segmentation approaches.
|
80 |
Adaptive rate-constrained transform video codingSu, Jonathan K. 12 1900 (has links)
No description available.
|
Page generated in 0.0491 seconds