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Designing user interfaces to enhance human interpretation of medical content-based image retrieval: application to PET-CT images

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INTERNATIONAL JOURNAL OF COMPUTER ASSISTED RADIOLOGY AND SURGERY 2013年第6期8卷 1003-1014页

作者： Kumar, Ashnil Kim, Jinman Bi, Lei Fulham, Michael Feng, Dagan Univ Sydney Sch Informat Technol Biomed & Multimedia Informat Technol BMIT Res Grp Sydney NSW 2006 Australia Royal Prince Alfred Hosp Dept Mol Imaging Sydney NSW Australia Univ Sydney Sydney Med Sch Sydney NSW 2006 Australia Shanghai Jiao Tong Univ Med X Res Inst Shanghai 200030 Peoples R China

Purpose content-based image retrieval (CBIR) in medicine has been demonstrated to improve evidence-based diagnosis, education, and teaching. However, the low clinical adoption of CBIR is partially because the focus of most studies has been the development of feature extraction and similarity measurement algorithms with limited work on facilitating better understanding of the similarity between complex volumetric and multi-modality medical images. In this paper, we present a method for defining user interfaces (UIs) that enable effective human user interpretation of retrieved images. Methods We derived a set of visualisation and interaction requirements based on the characteristics of modern volumetric medical images. We implemented a UI that visualised multiple views of a single image, displayed abstractions of image data, and provided access to supplementary non-image data. We also defined interactions for refining the search and visually indicating the similarities between images. We applied the UI for the retrieval of multi-modality positron emission tomography and computed tomography (PET-CT) images. We conducted a user survey to evaluate the capabilities of our UI. Results Our proposed method obtained a high rating (4 out of 5) in the majority of survey questions. In particular, the survey responses indicated the UI presented all the information necessary to understand the retrieved images, and did so in an intuitive manner. Conclusion Our proposed UI design improved the ability of users to interpret and understand the similarity between retrieved PET-CT images. The implementation of CBIR UIs designed to assist human interpretation could facilitate wider adoption of medical CBIR systems.

关键词： content-based image retrieval Retrieval interpretation User interface PET-CT

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Trace transform based identifier for speech based image retrieval on mobile phones

Trace transform based identifier for speech based image retr...

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International Conference on Advances in Computing, Communications and Informatics (ICACCI)

作者： S. M. Meena Sachin S Shetty Dept. of Information Science and Engineering B. V. Bhoomaraddi College of Engineering and Technology Hubli India

Present day mobile phones have evolved as multimedia devices, where users can capture and store photos, videos on their mobile phones. As the amount of digital multimedia content expands, it becomes increasingly difficult to find specific images in the device, giving rise to problems of organization, storing and retrieval of images. To improve human access to a large unstructured data in their personal collections on mobile phones, there is a need for effective and precise retrieval algorithms for the user to search browse and interact with these collections in real time. Retrieval algorithms are highly complex and this characteristic becomes more intense on mobile platform due to restrictions in architecture and computing power. In this paper we propose a speech based image retrieval algorithm for personal collections optimized for porting on to a mobile phones. We have treated the speech spectrogram as an image and applied trace transformation to obtain an unique and robust identifier string that acts as a fingerprint for image retrieval systems. Trace transform is popular in image processing algorithms because it is robust to affine transforms for feature extraction. The proposed algorithm exhibits optimization in memory and retrieval time costs.

关键词： Speech Transforms Spectrogram Mobile handsets Image retrieval multimedia communication Robustness

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DOAS: Device-Oriented Adaptive multimedia Scheme for 3 GPP LTE systems

DOAS: Device-Oriented Adaptive Multimedia Scheme for 3 GPP L...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Longhao Zou Ramona Trestian Gabriel-Miro Muntean Performance Engineering Laboratory School of Electronic Engineering Dublin City University Ireland

ISBN: (纸本)9781467362337

The growing popularity of the high-end mobile computing devices - smartphones, tablets, notebooks and more-equipped with high-speed network access, enables the mobile user to watch multimedia content from any source on any screen, at any time, while on the move or stationary. In this context, the network operators must ensure smooth video streaming with the lowest service delay, jitter, and packet loss. This paper proposes a resource efficient Device-Oriented Adaptive multimedia Scheme (DOAS) built on top of the downlink scheduler in LTE-Advanced systems. DOAS bases its adaptation decision on the end-user device display resolution information and Quality of Service (QoS). DOAS is implemented on top of the Proportional Fair (PF) and the well-known Modified Largest Weighted Delay First (M-LWDF) scheduling algorithms within the 3GPP LTE/LTE-Advanced system. The performance of the proposed adaptive multimedia scheme was analyzed and compared against a non-adaptive solution in terms of throughput, packet loss and PSNR.

关键词： Long-term Evolution Mobile Device Resolution Downlink Scheduling

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Swimmer Detection and Pose Estimation for Continuous Stroke Rate Determination

Swimmer Detection and Pose Estimation for Continuous Stroke ...

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Conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Zecha, Dan Greif, Thomas Lienhart, Rainer Univ Augsburg Multimedia Comp Lab Augsburg Germany

ISBN: (纸本)9780819489517

In this work we propose a novel approach to automatically detect a swimmer and estimate his/her pose continuously in order to derive an estimate of his/her stroke rate given that we observe the swimmer from the side. We divide a swimming cycle of each stroke into several intervals. Each interval represents a pose of the stroke. We use specifically trained object detectors to detect each pose of a stroke within a video and count the number of occurrences per time unit of the most distinctive poses (so-called key poses) of a stroke to continuously infer the stroke rate. We extensively evaluate the overall performance and the influence of the selected poses for all swimming styles on a data set consisting of a variety of swimmers.

关键词： Object detection pose estimation stroke rate estimation swimming channel

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Searching through Photographic Databases with QuickLook

Searching through Photographic Databases with QuickLook

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Conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Ciocca, Gianluigi Cusano, Claudio Schettini, Raimondo Santini, Simone de Polo, Andrea Tavanti, Francesca Univ Milano Bicocca Viale Sarca 336 I-20126 Milan Italy Univ Autonoma Madrid Madrid 28049 Spain Alinari 24 ORE SpA RD Multimedia Lab I-50123 Florence Italy

ISBN: (纸本)9780819489517

We present here the results obtained by including a new image descriptor, that we called prosemantic feature vector, within the framework of QuickLook(2) image retrieval system. By coupling the prosemantic features and the relevance feedback mechanism provided by QuickLook(2), the user can move in a more rapid and precise way through the feature space toward the intended goal. The prosemantic features are obtained by a two-step feature extraction process. At the first step, low level features related to image structure and color distribution are extracted from the images. At the second step, these features are used as input to a bank of classifiers, each one trained to recognize a given semantic category, to produce score vectors. We evaluated the efficacy of the prosemantic features under search tasks on a dataset provided by Fratelli Alinari Photo Archive.

关键词： Image retrieval image indexing semantic gap prosemantic features

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Using Wi-Fi-Hotspots as an intrusion vector into corporate networks

Using Wi-Fi-Hotspots as an intrusion vector into corporate n...

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Conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Scharsich, Maximilian Holl, Friedrich L. Univ. of Applied Sciences Brandenburg (Germany)

ISBN: (纸本)9780819489517

The following paper describes a method of gaining access to corporate networks through users who use virtual private networks over a modified Hotspot under the control of an attacker. Over 100,000 Hotspots offer an easy access to the Internet throughout the world. Almost every operator will inform the user though that browsing via a Hotspot is insecure because the connection is unencrypted. Hotspots often offer no typical encryption like WEP, WPA or WPA2;the communication is just send over the air, readable for everyone. This situation is not unknown - the Firesheep-Plugin for Firefox shows this impressive. One possible solution is the usage of a Virtual Private Network (VPN), which enables the user to communicate through a secure tunnel. In this typical business case the company's VPN is used to access internal documents and work with business' applications. All data sent out via a Hotspot using a VPN is encrypted and unreadable for potential attackers. But, what if the Hotspot, the user's connected to, is already under the control of an attacker? Nowadays it's easy to use hardware which extends the range of the Wi-Fi enormously and to set up an own Hotspot (with little expense). If an attacker then copies the login-site of a legit Hotspot and adapts his Hotspot in order to show the same site, he won't just be able to obtain the users credentials, he will also be capable of implementing malware into that site to gain access to the victim's personal device. Now that the attacker has gained access, he can start sniffing around and will possibly find out that a VPN application is being executed. If the attacker finds a proper application, he can start to use the victim's device to access the internal structure of the corporate network;the device now serves as a router for the attacker. Security mechanisms like firewalls and IDS, which are normally used as perimeter protection, won't be able to detect the attacker because he uses legitimate communication tunnels to get

关键词： Internet Control systems Network security Computer security Data communications Java multimedia Applied sciences Imaging systems Mobile devices

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Semantic storyboard of judicial debates: a novel multimedia summarization environment

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PROGRAM-ELECTRONIC LIBRARY AND INFORMATION systems 2012年第2期46卷 199-219页

作者： Fersini, E. Sartori, F. Univ Milano Bicocca DISCo Milan Italy

Purpose - The need of tools for content analysis, information extraction and retrieval of multimedia objects in their native form is strongly emphasized into the judicial domain: digital videos represent a fundamental informative source of events occurring during judicial proceedings that should be stored, organized and retrieved in short time and with low cost. This paper seeks to address these issues. Design/methodology/approach - In this context the JUMAS system, stem from the homonymous European Project (***), takes up the challenge of exploiting semantics and machine learning techniques towards a better usability of multimedia judicial folders. Findings - In this paper one of the most challenging issues addressed by the JUMAS project is described: extracting meaningful abstracts of given judicial debates in order to efficiently access salient contents. In particular, the authors present an ontology enhanced multimedia summarization environment able to derive a synthetic representation of judicial media contents by a limited loss of meaningful information while overcoming the information overload problem. Originality/value - The adoption of ontology-based query expansion has made it possible to improve the performance of multimedia summarization algorithms with respect to the traditional approaches based on statistics. The effectiveness of the proposed approach has been evaluated on real media contents, highlighting a good potential for extracting key events in the challenging area of judicial proceedings.

关键词： multimedia summarization Ontological query expansion multimedia Justice Information retrieval

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Optimimal resources utilization for indexing within a distributed multimedia retrieval system: An implementation for a video surveillance use case 18

Optimimal resources utilization for indexing within a distri...

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18th International Conference on Distributed multimedia systems, DMS 2012

作者： Codreanu, Dana Manzat, Ana-Maria Sedes, Florence Université de Toulouse IRIT UMR 5505 Toulouse31062 France

ISBN: (纸本)1891706322

Effective and flexible solutions for enabling reduced resource consumption and handling content and associated processing (indexing algorithms) diversity (in terms of location, technical characteristics, execution constraints, requested features) are essential in multimedia management systems. In this paper we present a distributed multimedia retrieval system that enables efficient and effective content processing and access. Though the system’s architecture is a generic one, in order to explain system’s functionalities we will present an instance of the architecture for a video surveillance use case. The proposed system addresses all important topic research concerning this type of systems (architecture, indexing, query) and proposes a novel two steps indexing approach (at acquisition time: implicit indexing and at query time: explicit indexing). We also present in this article how the user access management is done. © 2012 by Knowledge systems Institute Graduate School.

关键词： Indexing (of information)

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Design and Evaluation of Security Multi-Media Warnings for Children's Smartphones

Design and Evaluation of Security Multi-Media Warnings for C...

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Conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Menzel, Wiebke Tuchscheerer, Sven Fruth, Jana Kraetzer, Christian Dittmann, Jana Otto von Guericke Univ D-39016 Magdeburg Germany

ISBN: (纸本)9780819489517

This article describes primarily the development and empiric validation of a design for security warning messages on smartphones for primary school children (7-10 years old). Our design approach for security warnings for children uses a specific character and is based on recommendations of a paediatrician expert. The design criteria are adapted to children's skills, e. g. their visual, acoustic, and haptic perception and their literacy. The developed security warnings are prototypically implemented in an iOS application (on the iPhone 3G/4G) where children are warned by a simulated anti-malware background service, while they are busy with another task. For the evaluation we select methods for empiric validation of the design approach from the field of usability testing ("think aloud" test, questionnaires, log-files, etc.). Our security warnings prototype is evaluated in an empiric user study with 13 primary school children, aged between 8 and 9 years and of different gender (5 girls, 8 boys). The evaluation analysis shows, that nearly all children liked the design of our security warnings. Surprisingly, on several security warning messages most of the children react in the right way after reading the warning, although the meaning couldn't be interpreted in the right way. Another interesting result is, that several children relate specific information, e. g. update, to a specific character. Furthermore, it could be seen that most of the primary school test candidates have little awareness of security threats on smartphones. It is a very strong argument to develop e. g. tutorials or websites in order to raise awareness and teach children how to recognize security threats and how to react to them. Our design approach of security warnings for children's smartphones can be a basis for warning on other systems or applications like tutorials, which are used by children. In a second investigation, we focus on webpages, designed for children since smartphones and webpages (t

关键词： security warnings webpages children user-centered studies smartphones

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Proceedings of SPIE-IS and T Electronic Imaging - multimedia content access: algorithms and systems II

Proceedings of SPIE-IS and T Electronic Imaging - Multimedia...

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multimedia content access: algorithms and systems II

ISBN: (纸本)9780819469922

The proceedings contain 27 papers. The topics discussed include: hierarchical photo stream segmentation using context;giving order to image queries;logo detection using wavelet co-occurrence histograms;a novel approach to personal photo album representation and management;facial features matching using a virtual structuring element;picture management using person retrieval for consumer image collections;distributed wireless face recognition system;improving multimedia retrieval with a video OCR;improving scene detection by using gradual shot transitions as cues from film grammar;semantic video indexing using context-dependent fusion;highlight summarization in golf videos using audio signals;content-based image retrieval using greedy routing;evaluation of content-based features for user-centered image retrieval in small medial collections;and visual search engine for product images.

关键词： multimedia services

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