Myungseok Ki

Multimodal priority verification of face and speech using momentum back-propagation neural network

In this paper, we propose a priority verification method for multimodal biometric features by using a momentum back-propagation artificial neural network (MBP-ANN). We also propose a personal verification method using both face and speech to improve the rate of single biometric verification. False acceptance rate (FAR) and false rejection rate (FRR) have been a fundamental bottleneck of real-time personal verification. The proposed multimodal biometric method is to improve both verification rate and reliability in real-time by overcoming technical limitations of single biometric verification methods. The proposed method uses principal component analysis (PCA) for face recognition and hidden markov model (HMM) for speech recognition. It also uses MBP-ANN for the final decision of personal verification. Based on experimental results, the proposed system can reduce FAR down to 0.0001%, which proves that the proposed method overcomes the limitation of single biometric system and proves stable personal verification in real-time.

Interactive contents authoring system based on XMT and BIFS

As the Internet has been widely used for all the area of industries, the traditional characteristics of communication and broadcasting has been merged into a new service such as interactivity based broadcasting. Under an interactive environment, viewers not only watch broadcasting programs provided from a contents provider such as traditional broadcastings, but also pass their requirements to a service provider, obtain supplementary information and search broadcasting programs on the basis of their individual component objects. In order to access a program in terms of its component contents, thus, it is required to compose a scene and have reactions on the basis of its individual objects rather than a whole program itself. Therefore, this paper introduces a new authoring system, which can easily and conveniently produce an interactive contents-based broadcasting program by using MPEG-4 technologies. The authoring system presented in this paper describes a program in terms of two formats such as a textual format (XMT) for readability and a binary format (BiFS) for transmission. Since the XMT format is a XML-like one, it is easier for a user to understand and edit a scene composition. Alterantively, BiFS is suitable for transmission because of its binary property.

Bidirectional Interactive Contents Player for Terrestrial Digital Multimedia Broadcasting

This paper presents a bidirectional interactive contents player for terrestrial digital multimedia broadcasting (T-DMB). The presented player is capable of sending user requests to a proper return channel server using information included in a scene presentation. The player provides functionality to combine requested data received via communication networks with the initially broadcasted contents to present additional information to users. The result of a request transmitted back through the broadcasting network can also be presented properly using the presented player.

Interactive Multi-View Visual Contents Authoring System

This paper describes issues and consideration on authoring of interactive multi-view visual content based on MPEG-4. The issues include types of multi-view visual content; functionalities for user-interaction; scene composition for rendering; and multi-view visual content file format. The MPEG-4 standard, which aims to provide an object based audiovisual coding tool, has been developed to address the emerging needs from communications, interactive broadcasting as well as from mixed service models resulting from technological convergence. Due to the feature of object based coding, the use of MPEG-4 can resolve the format diversity problem of multi-view visual contents while providing high interactivity to users. Throughout this paper, we will present which issues need to be determined and how currently available tools can be effectively utilized for interactive multi-view visual content creation

ROUTE/DASH server system development for realtime UHD broadcasting

Recently, digital broadcasting has been increasingly demanded for high-definition broadcasting services such as HDR UHDTV. In addition, consumption environment of multimedia is also changing to a tendency to enjoy through various types of terminals. In order to satisfy such changes, we developed a ROUTE/DASH Server system to be inputted real-time encoded UHD stream, packetize it into ROUTE/DASH and output it to UDP, and we also verify it through developed ROUTE/DASH client. The developed ROUTE/DASH Server system provides a way to solve that the limitations of various network and receiving environment of existing MPEG-2 TS system. Using the developed system, it is expected that it can be used not only for multimedia service through broadband but also for transmission system of broadcasting system of ATSC 3.0 in which next standard broadcasting is being standardized.

MPEG-7 over MPEG-4 systems decoder for using metadata

In this paper, we propose the MPEG-7 over MPEG-4 systems decoder, which is compatible with MPEG-4 systems specification and added MPEG-7 module, which uses OCI and MPEG-7 textual descriptor for content search, and it is provides content management and metadata information.

Stereo matching using generalized symmetry transform

We propose a way to find corresponding points of a stereoscopic image by applying an algorithm of a generalized symmetry transform. A stereoscopic image entails the acquisition of a left image and right image simultaneously. Firstly, by using corner detection for the edge of both left and right images, feature points are analyzed, a square domain on the center of each feature point is found, and symmetry magnitude is such that edges within this domain have cumulated to positions of a feature point. Points are selected below the threshold value to correspond by executing a comparison of symmetry magnitude between edges of the right image and results of the left image. A more subdivided comparison of these corresponds in reserve through symmetry magnitude comparison of the radius unit within the domain, and if point correspondence could not be obtained in this way, corresponding points can be analyzed by measuring color correspondence rate of corresponding points in reserve. As for calculating correspond points, the proposed algorithm is more accurate than execution with feature points.