In minimal invasive surgery (MIS) a complete and seamless inspection of organs, e.g. the urinary bladder, using video endoscopes is often required for diagnostics. Since the endoscope is usually guided by free-hand, i...
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ISBN:
(纸本)9781424441211
In minimal invasive surgery (MIS) a complete and seamless inspection of organs, e.g. the urinary bladder, using video endoscopes is often required for diagnostics. Since the endoscope is usually guided by free-hand, it is difficult to ensure a sequence of seamless frame transitions. Also 2-D panoramic images showing an extended field of view (FOV) do not provide always reliable results, since their interpretations are limited by potentially strong geometric distortions. To overcome these limitations and provide a direct verification method, we develop a gap detection algorithm using graphs. Exploiting the motion information of the applied zig-zag scan, we construct a graph representation of the video sequence. Without any explicit global image visualization our graph search algorithm identifies reliably frame discontinuities, which would lead to holes and slit artifacts in a panoramic view. The algorithm shows high detection rates and provides a fast method to verify frame discontinuities in the whole video sequence. Missed regions are highlighted by local image compositions which can be displayed during the intervention for assistance and inspection control.
The usage of video endoscopes in cystoscopic interventions of the urinary bladder impedes an intuitive navigation. Although image-based solutions such as panorama images can provide extended views of the surgical fiel...
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ISBN:
(纸本)9781424441211
The usage of video endoscopes in cystoscopic interventions of the urinary bladder impedes an intuitive navigation. Although image-based solutions such as panorama images can provide extended views of the surgical field, a real-time 3-D navigation is not supported. Furthermore, the integration of common tracking systems in ambulant clinics is often hindered due to low usability and high costs. Thus, we discuss in this paper a first low-cost inertial navigation system. Our evaluation results show that in spite of lower sensor accuracies, mean errors between < 1° and 4° are achieved for solid angles. Using endoscopes with different view angles we apply an extended endoscope model for an adaptive displacement correction. Furthermore, we implement a first guided navigation tool for tumor re-identification in real-time.
Real objects in general are fractional-order systems, although in some types of systems the order is very close to an integer order. Since major advances have been made in this area in the last decades, it is possible...
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The green ICT is becoming extremely important for energy saving. The power consumption of network devices i.e., switches and routers, can be reduced by changing the transmission rate on their interfaces according to t...
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The green ICT is becoming extremely important for energy saving. The power consumption of network devices i.e., switches and routers, can be reduced by changing the transmission rate on their interfaces according to the amount of traffic. Energy-efficient routing based on the power reduction of devices may be attractive way for effectively saving energy over networks. Some schemes for energy-efficient routing have been studied in which traffic from some sources is aggregated on the particular link/node for power saving of others when the amount of traffic on network becomes low. Effectiveness of these schemes were shown by computer simulations and experiments in their own network environments. Therefore in this paper, we first implement some schemes on our test-bed network to compare both power consumption and transmission performance of them. We also investigate the applicability and scalability of these schemes on large scale networks and finally discuss important issues for more general and effective schemes.
This paper describes an optimal mapping of the torus self-organizing map for a human forearm motion discrimination on the basis of the myoelectric signals. This study uses the torus self-organizing map (Torus- SOM) fo...
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A discontinuous control law is proposed to achieve global asymptotic stabilization for oscillators with bounded delayed input. Only the position signal is used to generate the piecewise constant control signal. The as...
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Searchable encryption allows an encrypter to send a message, in an encrypted form, to a decryptor who can delegate to a third party to search the encrypted message for keywords without losing encrypted message content...
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Reversible logic is a promising design methodology, particularly in the scope of quantum computing, for extremely low power consumption by elimination of power dissipation due to information loss. Anticipated high fau...
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Reversible logic is a promising design methodology, particularly in the scope of quantum computing, for extremely low power consumption by elimination of power dissipation due to information loss. Anticipated high fault rates for future technologies raise demand for fault tolerance in reversible logic. In this paper we propose fault masking techniques (to prevent error propagation) for reversible logic. We present different implementations of reversible majority voters. Using voter insertion techniques and taking advantage of available non-functional outputs, we are able to provide diagnosis information with adjustable resolution for reversible circuits. Such diagnosability has important applications in manufacturing testing as well as online repair. In contrast to previous work this voter is robust against single point of failure. We target missing and repeated gate fault models which are specific to reversible logic.
A safe can be made safely by making it key-free. Such a safe can be opened by recognizing the owner's palmprint features only. A new method based on wavelet transform is proposed according to the palmprint line di...
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The electric power is indispensable for modern life. However, there is a problem of harmonic disturbance when the harmonic power runs into electronic devices. To overcome the problem and realize a stable supply of the...
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