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This paper presents an efficient video-on-demand (VOD) scheme for free viewpoint television (FTV), and proposes a data format and its data generation method to provide a walkthrough experience. We employ a hybrid rendering approach to describe a 3D scene using 3D model data for objects and textures. However, conventional hybrid rendering methods such as multi-texturing include excessive redundancy...
We propose a robust background subtraction method for multi-view images, which is essential for realizing free viewpoint video where an accurate 3D model is required. Most of the conventional methods determine background using only visual information from a single camera image, and the precise silhouette cannot be obtained. Our method employs an approach of integrating multi-view images taken by multiple...
Motion-compensated (MC) prediction is one of the most effective coding tools for high-compression video coding. In former works, adaptive interpolation filter (AIF) technology, which improves the coding performance of the fractional-pel MC, has been proposed. As for the real-time codec system, the implementation of AIF based on the Wiener filter algorithm is difficult because of its high computational...
This paper proposes a new method to automatically detect important objects from video content. Our approach extracts video frames that show important objects, by recognition of typical TV production techniques. We also present a prototype application for DVRs, which utilizes the proposed method to enable easy access to important scenes of TV programs.
In this paper, the authors propose a novel method to measure the perceived picture quality of H.264 coded video based on hybrid no reference framework. The latter term means that the proposed model uses only receiver-side information for objective video quality assessment, but analyzes both the compressed bitstream and baseband signals of the decoded picture to improve the estimation accuracy of the...
In this paper, we present a pioneering study on genre classification for home video. Analyzing home video is a challenging problem because it is generally unstructured and of low production quality in audio and video. Our approach is to define a set of genres referring to those in the actual video sharing site, and to extract salient low level features from MPEG compressed data which are robust to...
In this paper, we propose geometry based image-based rendering method for sparse multicamera system using multiple local ray-space representation and 3D model generation. In this system, the quality of walk-through view experience is impaired by inaccurate camera parameters and 3D model. In order to eliminate these affects, we enhance the reconstructed local ray-spaces using stereo matching approach...
In this paper, we propose two novel methods for arbitrary listening-point generation for 3D audio-video (3DAV) integration in a large-scale multipoint cameras and microphones system with abilities to process, and display information of any recorded 3D scene in realtime. With this system, users are able to control their own viewpoint/listening-point position, freely. Arbitrary listening-point can be...
In this paper, visual cryptography for halftone images is proposed, which uses threshold arrays generated by a void-and-cluster method. The proposed halftone visual cryptography (HFC) using threshold arrays shows great flexibility for a combination of share images in order to decode a secret image. Moreover, it also achieves high quality share images, high speed processing and extensibility to (k,n)...
In this paper, we propose an efficient algorithm for conversion of an MP3 stream into AAC. Generally, this kind of conversion, transcoding, requires full decoding and re-encoding. However, the re-encoding based transcoding process may result in degradation of quality and take longer than encoding from a PCM signal. This paper proposes a method to inherit the frame structure and quantization scale...
A novel video watermarking method is proposed, which can directly embed a watermark into a bit stream generated by an H.264 video encoder. Watermarking to encoded data provides a content provider of flexible capability to attach secret information; however it brings a drift problem. A drift compensation method has been proposed, however it requires many computations such as DCT and motion compensation...
Multimedia contents transmission and management system "VAST-web" is proposed. It employs store-and-forward transmission technique to maintain the contents quality. It also has a central management function of contents stored at remote locations so that contents query and contents pull model as well as contents push model are supported. A novel transmission protocol "SVFTP" is...
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