The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Luis Herranz - One of the best experts on this subject based on the ideXlab platform.
-
scalable Storyboards in handheld devices applications and evaluation metrics
Multimedia Tools and Applications, 2016Co-Authors: Luis Herranz, Shuqiang JiangAbstract:Summaries are an essential component of video retrieval and browsing systems. Most research in video summarization has focused on content analysis to obtain compact yet comprehensive representations of video items. However, important aspects such as how they can be effectively integrated in mobile interfaces and how to predict the quality and usability of the summaries have not been investigated. Conventional summaries are limited to a single instance with certain length (i.e. a single scale). In contrast, scalable summaries target representations with multiple scales, that is, a set of summaries with increasing length in which longer summaries include more information about the video. Thus, scalability provides high flexibility that can be exploited in devices such as smartphones or tablets to provide versions of the summary adapted to the limited visualization area. In this paper, we explore the application of scalable Storyboards to summary adaptation and zoomable video navigation in handheld devices. By introducing a new adaptation dimension related with the summarization scale, we can formulate navigation and adaptation in a two-dimensional adaptation space, where different navigation actions modify the trajectory in that space. We also describe the challenges to evaluate scalable summaries and some usability issues that arise from having multiple scales, proposing some objective metrics that can provide useful insight about their potential quality and usability without requiring very costly user studies. Experimental results show a reasonable agreement with the trends shown in subjective evaluations. Experiments also show that content-based scalable Storyboards are less redundant and useful than the content-blind baselines.
-
flexible navigation in smartphones and tablets using scalable Storyboards
International Conference on Multimedia Retrieval, 2013Co-Authors: Shuai Zheng, Luis Herranz, Shuqiang JiangAbstract:In this demo paper we present a multiscale browsing interface for handheld devices, in which the user can interactively change the scale of the storyboard to easily adjust the amount of information desired. Conventional and hierarchical Storyboards provide one or very few possible lengths. In contrast, scalable Storyboards allow the number of images and the storyboard itself to be adapted to the device constraints (e.g. aspect ratio, resolution) and navigation state with much finer granularity. Several levels and modes, including segment of interest, are provided for more intuitive and convenient navigation.
-
multiscale browsing through video collections in smartphones using scalable Storyboards
International Conference on Multimedia and Expo, 2012Co-Authors: Luis HerranzAbstract:This paper explores how multiscale browsing can be integrated with smart phone interfaces to provide enhanced navigation through video collections. We propose a system that allows the user to interactively change the scale of the Storyboards, so the user can easily adjust the amount of information provided by them. Three different methods to select key frames are studied, including an efficient method that analyzes the video and creates a scalable description, with very little computational cost. Then, Storyboards of any length can be retrieved on demand without any further analysis, which is very convenient to provide fast multiscale navigation. Experimental evaluations show how this method improves the utility of the summaries and enhances user experience.
Min Chen - One of the best experts on this subject based on the ideXlab platform.
-
hierarchical event selection for video Storyboards with a case study on snooker video visualization
IEEE Transactions on Visualization and Computer Graphics, 2011Co-Authors: Matthew L Parry, Philip A Legg, David H S Chung, Iwan W Griffiths, Min ChenAbstract:Video storyboard, which is a form of video visualization, summarizes the major events in a video using illustrative visualization. There are three main technical challenges in creating a video storyboard, (a) event classification, (b) event selection and (c) event illustration. Among these challenges, (a) is highly application-dependent and requires a significant amount of application specific semantics to be encoded in a system or manually specified by users. This paper focuses on challenges (b) and (c). In particular, we present a framework for hierarchical event representation, and an importance-based selection algorithm for supporting the creation of a video storyboard from a video. We consider the storyboard to be an event summarization for the whole video, whilst each individual illustration on the board is also an event summarization but for a smaller time window. We utilized a 3D visualization template for depicting and annotating events in illustrations. To demonstrate the concepts and algorithms developed, we use Snooker video visualization as a case study, because it has a concrete and agreeable set of semantic definitions for events and can make use of existing techniques of event detection and 3D reconstruction in a reliable manner. Nevertheless, most of our concepts and algorithms developed for challenges (b) and (c) can be applied to other application areas.
Ahmed E Hassan - One of the best experts on this subject based on the ideXlab platform.
-
animated visualization of software history using evolution Storyboards
Working Conference on Reverse Engineering, 2006Co-Authors: Dirk Beyer, Ahmed E HassanAbstract:The understanding of the structure of a software system can be improved by analyzing the system?s evolution during development. Visualizations of software history that provide only static views do not capture the dynamic nature of software evolution. We present a new visualization technique, the Evolution Storyboard, which provides dynamic views of the evolution of a software?s structure. An evolution storyboard consists of a sequence of animated panels, which highlight the structural changes in the system; one panel for each considered time period. Using Storyboards, engineers can spot good design, signs of structural decay, or the spread of cross cutting concerns in the code. We implemented our concepts in a tool, which automatically extracts software dependency graphs from version control repositories and computes Storyboards based on panels for different time periods. For applying our approach in practice, we provide a step by step guide that others can follow along the storyboard visualizations, in order to study the evolution of large systems. We have applied our method to several large open source software systems. In this paper, we demonstrate that our method provides additional information (compared to static views) on the ArgoUML project, an open source UML modeling tool.
-
evolution Storyboards visualization of software structure dynamics
International Conference on Program Comprehension, 2006Co-Authors: Dirk Beyer, Ahmed E HassanAbstract:Large software systems have a rich development history. Mining certain aspects of this rich history can reveal interesting insights into the system and its structure. Previous approaches to visualize the evolution of software systems provide static views. These static views often do not fully capture the dynamic nature of evolution. We introduce the Evolution Storyboard, a visualization which provides dynamic views of the evolution of a softwares structure. Our tool implementation takes as input a series of software graphs, e.g., call graphs or co-change graphs, and automatically generates an evolution storyboard. To illustrate the concept, we present a storyboard for PostgreSQL, as a representative example for large open source systems. Evolution Storyboards help to understand a systems structure and to reveal its possible decay over time. The storyboard highlights important changes in the structure during the lifetime of a software system, and how artifacts changed their dependencies over time.
Caitlain Devereaux Lewis - One of the best experts on this subject based on the ideXlab platform.
-
prioritization strategies for video storyboard keyframes
Journal of the Association for Information Science and Technology, 2007Co-Authors: Hemalata Iyer, Caitlain Devereaux LewisAbstract:This exploratory study investigates one type of video surrogate, Storyboards, in terms of their ability to summarize and communicate the themes of arts-related videos. An HTML interface containing the Storyboards, videos, and instructions was developed and run in a standard browser. Three phases—consisting of storyboard evaluation, full-length video evaluation, and their comparison—were completed by each user for three different videos. The data were analyzed for issues relating to keywords, summaries, and recognition of visual style for both the Storyboards and the full-length videos. The linear sequence and narrative structure of Storyboards are questioned, and a three-tiered model is proposed. The first layer consists of keyframes representing the “entity” and “action” of the video's central theme, the second layer consists of “entity” and “action” keyframes with regard to background or supporting information, and the third layer is composed of keyframes representing attributes, locations, and time periods. This structure facilitates the identification of appropriate keyframes for Storyboards, eliminating redundant or peripheral images, and improves the storyboard's ability to communicate the essential message of videos. The tiered model is motivated and supported by the user study as well as current research on video surrogates and classical indexing theory. © 2007 Wiley Periodicals, Inc.
Jose A Pino - One of the best experts on this subject based on the ideXlab platform.
-
an end user approach to business process modeling
Journal of Network and Computer Applications, 2013Co-Authors: Pedro Antunes, David Simies, Luis Carrico, Jose A PinoAbstract:This paper discusses the main differences between humanistic and mechanistic business process modeling. While the mechanistic approach requires strict process formalization, emphasizes technical details, and constrains the modeling task to technology experts, the humanistic approach is more centered on the end-user. We developed a modeling approach and a collaborative tool supporting end-user business process modeling. Design Storyboards were adopted as a paradigm for knowledge representation and visual composition. The main contributions from this research include the knowledge representation structure and a collaborative tool supporting visual composition of business process models.
