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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Broadcast Engineering
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Journal DOI :
The Korean Institute of Broadcast and Media Engineers
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Volume & Issues
Volume 20, Issue 6 - Nov 2015
Volume 20, Issue 5 - Sep 2015
Volume 20, Issue 4 - Jul 2015
Volume 20, Issue 3 - May 2015
Volume 20, Issue 2 - Mar 2015
Volume 20, Issue 1 - Jan 2015
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Weighted Prediction considering Global Brightness Variation and Local Brightness Variation in HEVC
Lim, Sung-won ; Moon, Joo-hee ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 489~496
DOI : 10.5909/JBE.2015.20.4.489
In this paper, a new weighted prediction scheme is proposed to improve the coding efficiency for video scenes containing brightness variations. Conventional weighted prediction is applied by the reference picture and use only one weighted parameter set. Thus, it is only useful for GBV(Glabal Brightness Variation). In order to solve this problem, the proposed algorithm use three kind of schemes depending on situation. Experimental results show that maximum coding efficiency gain of the proposed method is up to 10.2% in luminance. Average computional time complexity is increased about 163% in encoder and about 101% in decoder.
Performance Analysis of Scalable HEVC Coding Tools
Kim, Yongtae ; Choi, Jinhyuk ; Choi, Haechul ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 497~508
DOI : 10.5909/JBE.2015.20.4.497
Current communication networks consist of channels with various throughputs, protocols, and packet loss rates. Moreover, there are also diverse user multimedia consumption devices having different capabilities and screen sizes. Thus, a practical necessity of scalability on video coding have been gradually increasing. Recently, The Scalable High Efficiency Video Coding(SHVC) standard is developed by Joint Collaborative Team on Video Coding(JCT-VC) organized in cooperation with MPEG of ISO/IEC and VCEG of ITU-T. This paper introduces coding tools of SHVC including adopted and unadopted tools discussed in the process of the SHVC standardization. Furthermore, the individual tool and combined tool set are evaluated in terms of coding efficiency relative to a single layer coding structure. This analysis would be useful for developing a fast SHVC encoder as well as researching on a new scalable coding tool.
A Design for Extension Codec based on Legacy Codec
Young, Su Heo ; Bang, Gun ; Park, Gwang Hoon ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 509~520
DOI : 10.5909/JBE.2015.20.4.509
A design for the merge mode of three dimensional High Efficiency Video Coding (3D-HEVC) is proposed in this paper. The proposed design can reduce the implementation complexity by removing the duplicated modules of the HEVC. For the extension codec, the implementation complexity is as crucial as coding efficiency, meaning if possible, extension codec needs to be easily implemented through by reusing the design of the legacy codec as-is. However, the existing merging process of 3D-HEVC had been built-in integrated in the inside of the HEVC merging process. Thus the duplicated merging process of HEVC had to be fully re-implemented in the 3D-HEVC. Consequently the implementation complexity of the extension codec was very high. The proposed 3D-HEVC merge mode is divided into following two stages; the process to reuse the HEVC modules without any modification; and the reprocessing process for newly added and modified merging modules in 3D-HEVC. By applying the proposed method, the re-implemented HEVC modules, which accounted for 51.4% of 3D-HEVC merge mode confirmed through the operational analysis of algorithm, can be eliminated, while maintaining the same coding efficiency and computational complexity.
Piecewise Image Denoising with Multi-scale Block Region Detector based on Quadtree Structure
Lee, Jeehyun ; Jeong, Jechang ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 521~532
DOI : 10.5909/JBE.2015.20.4.521
This paper presents a piecewise image denoising with multi-scale block region detector based on quadtree structure for effective image restoration. Proposed piecewise image denoising method suggests multi-scale block region detector (MBRD) by dividing whole pixels of a noisy image into three parts, with regional characteristics: strong variation region, weak variation region, and flat region. These regions are classified according to total pixels variation between multi-scale blocks and are applied principal component analysis with local pixel grouping, bilateral filtering, and structure-preserving image decomposition operator called relative total variation. The performance of proposed method is evaluated by Experimental results. we can observe that region detection results generated by the detector seems to be well classified along the characteristics of regions. In addition, the piecewise image denoising provides the positive gain with regard to PSNR performance. In the visual evaluation, details and edges are preserved efficiently over the each region; therefore, the proposed method effectively reduces the noise and it proves that it improves the performance of denoising by the restoration process according to the region characteristics.
Whole Frame Error Concealment with an Adaptive PU-based Motion Vector Extrapolation and Boundary Matching
Kim, Seounghwi ; Lee, Dongkyu ; Oh, Seoung-Jun ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 533~544
DOI : 10.5909/JBE.2015.20.4.533
Recently, most of the video services are usually transmitted in wireless networks. In networks environment, a packet of video is likely to be lost during transmission. For this reason, this paper proposes a new Error Concealment (EC) algorithm. For High Efficiency Video Coding (HEVC) bitstreams, the proposed algorithm includes Adaptive Prediction Unit-based Motion Vector Extrapolation (APMVE) and Boundary Matching (BM) algorithm, which employs both the temporal and spatial correlation. APMVE adaptively decides a Error Concealment Basic Unit (ECBU) by using the PU information of the previous frame and BM employing the spatial correlation is applied to only unreliable blocks. Simulation results show that the proposed algorithm provides the higher subjective quality by reducing blocking artifacts which appear in other existing algorithms.
Overview of Inter-Component Coding in 3D-HEVC
Park, Min Woo ; Lee, Jin Young ; Kim, Chanyul ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 545~556
DOI : 10.5909/JBE.2015.20.4.545
A HEVC-compatible 3D video coding method (3D-HEVC) has been recently developed as an extension of the high efficiency video coding (HEVC) standard. In order to efficiently deal with the multi-view video plus depth (MVD) format, 3D-HEVC exploits an inter-component prediction which allows the prediction between texture and depth map images in addition to a temporal prediction used in the conventional single layer video coding such as H.264/AVC and HEVC. The performance of the inter-component prediction is normally affected by the accuracy of the disparity vector, and thus it is important to have an accurate disparity vector used for the inter-component prediction. This paper, therefore, introduces a disparity derivation method and inter-component algorithms using the disparity vector for the efficient 3D video coding. Simulation results show that the 3D-HEVC provides higher coding performance compared with the simulcast approach using HEVC and the simple multi-view extension (MH-HEVC).
Enhancement of Saliency Map Using Motion and Affinity Model
Gil, Jong In ; Choi, Changyeol ; Kim, Manbae ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 557~567
DOI : 10.5909/JBE.2015.20.4.557
Over the past decades, a variety of spatial saliency methods have been introduced. Recently, motion saliency has gained much interests, where motion data estimated from an image sequence are utilized. In general, motion saliency requires reliable motion data as well as image segmentation for producing satisfactory saliency map which poses difficulty in most natural images. To overcome this, we propose a motion-based saliency generation that enhances the spatial saliency based on the combination of spatial and motion saliencies as well as motion complexity without the consideration of complex motion classification and image segmentation. Further, an affinity model is integrated for the purpose of connecting close-by pixels with different colors and obtaining a similar saliency. In experiment, we performed the proposed method on eleven test sets. From the objective performance evaluation, we validated that the proposed method produces better result than spatial saliency based on objective evaluation as well as ROC test.
Touch Noise Reduction using Kalman Filter and Pre-emphasis
Yu, Seung-wan ; Song, Byung Cheol ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 568~579
DOI : 10.5909/JBE.2015.20.4.568
Recently, mobile devices with touch display panel are widely used. Accuracy and reaction speed of touch signal are very important in touch devices. Therefore, we need to develop an effective algorithm to reduce touch noise quickly and accurately. This paper proposes a touch noise reduction algorithm using Kalman filtering in consideration of signal motion. First, a specific pre-emphasis processing is applied to an input signal so as to maximize the effect of Kalman filtering. In other words, a pure signal in the touch signal increases but noise in the touch signal decreases. Next, motion of the signal is detected. Motion estimation is performed only if motion is detected. If we detect motion by using the only neighborhood of the signal, we can reduce about 75% of the computation in comparison with examining the entire area. Finally, Kalman filtering using the previous state of current signal is performed. Experimental results show that the proposed algorithm suppresses touch noise sufficiently without degradation of the pure signal
2-Subset Difference Broadcast Encryption System Based on Secret Sharing Method
Lee, Jae Hwan ; Park, Jong Hwan ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 580~597
DOI : 10.5909/JBE.2015.20.4.580
Broadcast encryption system is a cryptographic primitive that enables a sender to broadcast a message to a set of receivers in a secure channel. Out of previous proposed broadcast encryption systems, the most effective is the one that uses the Subset Difference(SD) method in a binary tree structure. The SD method has been realized by two underlying approaches: Pseudo-Random Generator(PRG) and Secret Sharing(SS). 2-SD method is the generalized version of the SD method by which two subsets of revoked receivers can be dealt with by one subset (in an SD-based broadcast encryption system). The primary advantage of the 2-SD method is to further reduce the size of transmission overhead, compared to the SD method. Until now, however, there is no known broadcast encryption system that is based on such a 2-SD technique using either PRG or SS basis. In this paper, we suggest a new 2-SD broadcast encryption system using the SS-based technique that was suggested by Jae Hwan Lee et al. in 2014
. The new system can reduce the size of ciphertext by 25% of the one in the previous SS-based broadcast encryption system. Also, on a theoretical note, ours is the first 2-SD broadcast encryption system that is provably secure.
A Study on Internet Emergency Alert Distribution System Adaptive to the Receiver Characteristics
Ahn, Soyoung ; Jeon, Inchan ; Kim, Jihee ; Lee, Yong Tae ; Choi, Seong Jong ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 598~605
DOI : 10.5909/JBE.2015.20.4.598
Effective alerts will drastically mitigate the disaster impacts. One way to enhance the effectiveness is to prepare multiple alert distribution channels. In this paper, we propose a new emergency alert distribution system that will solve the weaknesses of the current distribution systems, such as Cell Broadcasting System and T-DMB Automatic Emergency Alert Service. The weaknesses are: the limitation of message length, small portions of terminals that can receive and display the alert signal, and one-way communication service. To solve these problems, we propose an emergency alert distribution system over the Internet with RSS (Rich Site Summary) format. The system also has the capability of adaptive alert filtering according to the receiver characteristics. We analyzed the characteristics of RSS as an alerting format, and draw functional requirements satisfying use case scenarios. We designed the system only with major requirements and verified it on our test bed. Sending richer message contents through various receiving terminals, the system will achieve more effective emergency alert service.
Face Replacement under Different Illumination Condition
Song, Joongseok ; Zhang, Xingjie ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 606~618
DOI : 10.5909/JBE.2015.20.4.606
Computer graphics(CG) is being important technique in media contents such as movie and TV. Especially, face replacement technique which replaces the faces between different images have been studied as a typical technology of CG by academia and researchers for a long time. In this paper, we propose the face replacement method between target and reference images under different illumination environment without 3D model. In experiments, we verified that the proposed method could naturally replace the faces between reference and target images under different illumination condition.
Online Content Editing System to Edit Broadcasting and Personal Contents
Yang, Chang Mo ; Chung, Kwangsue ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 619~631
DOI : 10.5909/JBE.2015.20.4.619
In this paper, we propose a new online content editing system to edit the broadcasting and personal contents. The proposed editing system consists of the content management server and the content editor, in which the content management server is used for storing the contents, while the content editor is used for editing the contents via the user interface. Unlike the existing content editing methods which edit the downloaded contents, the proposed editing system edits the contents stored in the content management server while the content editor plays them by using the streaming technology. However, it is not effective to edit the whole segments of contents while playing them by using the streaming technology. To resolve the problem, the proposed editing system performs the scene detection of the contents, and the detected scene information is used for playing and editing of contents. After completing the content editing, the edited information is uploaded to the content management server as a metadata format. In the proposed editing system, both scene and edited information are represented only as the metadata format, and the physical content segmentation according to the scene and edited information is not performed. The implementation results show that the proposed editing system provides similar performances with the existing content editing methods which use the content download and editing methods.
Fast Graphic Visualization of Frequency Response for Audio Equalizer
Kim, Ki-Jun ; Park, Hochong ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 632~640
DOI : 10.5909/JBE.2015.20.4.632
This paper proposes a new method for fast graphic visualization of accurate frequency response of audio equalizer (EQ). When a logarithmic frequency scale is used, a frequency response in high resolution is required for accurate low-band frequency response. However, the high-resolution frequency response requires a huge amount of computational load, which makes the real-time graphic visualization of frequency response impossible. In order to solve the problem of computational load, the proposed method utilizes a low-resolution virtual frequency response in the mid band. It first computes the virtual frequency response of each filter of EQ in the mid band, and then moves it to the target band so that the result corresponds to the desired filter response. Then, it determines the final frequency response of EQ by combining all filter responses. The experiments confirm that the proposed method provides the frequency response of EQ which has an equivalent shape to that computed in high frequency resolution with huge computational load.
Frame-level Matching for Near Duplicate Videos Using Binary Frame Descriptor
Kim, Kyung-Rae ; Lee, Jun-Tae ; Jang, Won-Dong ; Kim, Chang-Su ;
Journal of Broadcast Engineering, volume 20, issue 4, 2015, Pages 641~644
DOI : 10.5909/JBE.2015.20.4.641
In this paper, we propose a precise frame-level near-duplicate video matching algorithm. First, a binary frame descriptor for near-duplicate video matching is proposed. The binary frame descriptor divides a frame into patches and represent the relations between patches in bits. Seconds, we formulate a cost function for the matching, composed of matching costs and compensatory costs. Then, we roughly determine initial matchings and refine the matchings iteratively to minimize the cost function. Experimental results demonstrate that the proposed algorithm provides efficient performance for frame-level near duplicate video matching.