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Zepernick, Hans-Juergen
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Publications (10 of 245) Show all publications
Iqbal, M. I. & Zepernick, H.-J. (2019). Error sensitivity analysis of DMB transport streams. IEEE Access, 7, 154424-154434, Article ID 8876649.
Open this publication in new window or tab >>Error sensitivity analysis of DMB transport streams
2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 154424-154434, article id 8876649Article in journal (Refereed) Published
Abstract [en]

In this paper, we examine the sensitivity of the digital multimedia broadcasting (DMB) MPEG-2 transport stream (TS) format to transmission errors. To find the sensitivity of different parts of TS packets to transmission errors, each TS packet is divided into four cells, i.e., the first three cells comprising 48 bytes each and the last cell is of 44 bytes length. Bit errors are then introduced into these different parts of the TS packets. The sensitivity of DMB videos to transmission errors and their locations is assessed in terms of the following measures: 1) Number of decoder crashes; 2) Number of decodable videos; 3) Total number of decodable frames; and 4) Objective perceptual video quality of the decoded videos. The structural similarity index and visual information fidelity criterion are used as objective perceptual quality metrics. Simulations are performed on seven different DMB videos using various bit error rates. The results show that the first cell of the TS packets is highly sensitive to bit errors compared to the subsequent three cells, both in terms of spatial and temporal video quality. Further, the sensitivity decreases from Cell 1 to Cell 4 of a DMB TS packet. The error sensitivity analysis reported in this paper may guide the development of more reliable transmission systems for future DMB systems and services. Specifically, the insights gained from this study may support designing better error control schemes that take the sensitivity of different parts of DMB TS packets into consideration.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Digital multimedia broadcasting, error sensitivity, objective perceptual video quality, structural similarity index, transport stream, visual information fidelity, Bit error rate, Cells, Cytology, Decoding, Error analysis, Motion Picture Experts Group standards, Sensitivity analysis, Perceptual video quality, Structural similarity indices, Transport streams
National Category
Telecommunications Communication Systems
Identifiers
urn:nbn:se:bth-19143 (URN)10.1109/ACCESS.2019.2948227 (DOI)000510408900003 ()
Available from: 2020-01-23 Created: 2020-01-23 Last updated: 2020-02-20Bibliographically approved
Fiedler, M., Zepernick, H.-J. & Kelkkanen, V. (2019). Network-induced temporal disturbances in virtual reality applications. In: 2019 11th International Conference on Quality of Multimedia Experience, QoMEX 2019: . Paper presented at 11th International Conference on Quality of Multimedia Experience, QoMEX, Berlin, 5 June 2019 through 7 June 2019. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Network-induced temporal disturbances in virtual reality applications
2019 (English)In: 2019 11th International Conference on Quality of Multimedia Experience, QoMEX 2019, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Virtual Reality (VR) applications put high demands on software and hardware in order to enable an immersive experience for the user and avoid causing simulator sickness. As soon as networks become part of the Motion-To-Photon (MTP) path between rendering and display, there is a risk for extraordinary delays that may impair Quality of Experience (QoE). This short paper provides an overview of latency measurements and models that are applicable to the MTP path, complemented by demands on user and network levels. It specifically reports on freeze duration measurements using a commercial TPCAST wireless VR solution, and identifies a corresponding stochastic model of the freeze length distribution, which may serve as disturbance model for VR QoE studies. © 2019 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Application programs, Multimedia systems, Quality of service, Stochastic systems, Virtual reality, Disturbance modeling, High demand, Latency measurements, Length distributions, Network level, Quality of experience (QoE), Simulator sickness, Software and hardwares, Stochastic models
National Category
Communication Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-18605 (URN)10.1109/QoMEX.2019.8743304 (DOI)000482562000056 ()2-s2.0-85068679022 (Scopus ID)9781538682128 (ISBN)
Conference
11th International Conference on Quality of Multimedia Experience, QoMEX, Berlin, 5 June 2019 through 7 June 2019
Funder
Knowledge Foundation, 20170056
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-13Bibliographically approved
Elwardy, M., Zepernick, H.-J., Chu, T. M. & Sundstedt, V. (2019). Objective Perceptual Video Quality Prediction Using Spatial and Temporal Information Differences. In: Proceedings - 2019 19th International Symposium on Communications and Information Technologies, ISCIT 2019: . Paper presented at 19th International Symposium on Communications and Information Technologies, ISCIT, Ho Chi Minh City, 25 September 2019 through 27 September 2019 (pp. 436-441). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Objective Perceptual Video Quality Prediction Using Spatial and Temporal Information Differences
2019 (English)In: Proceedings - 2019 19th International Symposium on Communications and Information Technologies, ISCIT 2019, Institute of Electrical and Electronics Engineers Inc. , 2019, p. 436-441Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, objective perceptual video quality models are proposed that use spatial and temporal perceptual information differences for predicting video quality as perceived by human observers. Spatial perceptual information characterizes the complexity and temporal perceptual information quantifies the motion contained in a video. As such, differences in the spatial and temporal perceptual information of a reference video (original) and test video (processed) may be used to predict quality of videos that have undergone encoding, transmission, or other processing. In particular, several video quality prediction functions are derived using curve fitting along with training and validation on data from a publicly available annotated database. The obtained functions provide predicted mean opinion scores as a measure of perceptual quality subject to spatial and temporal perceptual information differences. The analysis of the video quality prediction performance of the proposed models shows that differences in spatial and temporal perceptual information can be used for objective video quality prediction. © 2019 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
mean opinion score, objective video quality, quality prediction performance, Spatial perceptual information, temporal perceptual information, video quality prediction, Curve fitting, Forecasting, Mean opinion scores, Perceptual information, Quality prediction, Video quality, Information use
National Category
Telecommunications Computer Sciences
Identifiers
urn:nbn:se:bth-19048 (URN)10.1109/ISCIT.2019.8905186 (DOI)2-s2.0-85076234417 (Scopus ID)9781728150093 (ISBN)
Conference
19th International Symposium on Communications and Information Technologies, ISCIT, Ho Chi Minh City, 25 September 2019 through 27 September 2019
Available from: 2019-12-27 Created: 2019-12-27 Last updated: 2019-12-27Bibliographically approved
Tran, D. N., Zepernick, H.-J. & Chu, T. M. (2019). On LSB Data Hiding in High-Definition Images Using Morphological Operations. In: Proceedings - 2019 19th International Symposium on Communications and Information Technologies, ISCIT 2019: . Paper presented at 19th International Symposium on Communications and Information Technologies, ISCIT, Ho Chi Minh City, 25 September 2019 through 27 September 2019 (pp. 386-391). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>On LSB Data Hiding in High-Definition Images Using Morphological Operations
2019 (English)In: Proceedings - 2019 19th International Symposium on Communications and Information Technologies, ISCIT 2019, Institute of Electrical and Electronics Engineers Inc. , 2019, p. 386-391Conference paper, Published paper (Refereed)
Abstract [en]

The aim of steganography is to conceal the presence of communication by way of hiding secret data in perceptually irrelevant parts of a cover object. In this paper, we propose a method for hiding secret images in edge regions of high-definition (HD) images because the human visual system is less sensitive to intensity changes in these regions. In particular, least significant bit substitution is used to embed a secret image in the edge regions of a HD cover image. The edge regions are obtained using a Canny edge detector followed by morphological operations which are used to control the hiding capacity. A performance assessment of the proposed method reveals the trade-off between capacity, detectability, and perceptibility of the hidden data. © 2019 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Economic and social effects, Mathematical morphology, Steganography, Canny edge detectors, Hiding capacity, High definition, Human Visual System, Intensity change, Least-significant-bit substitution, Morphological operations, Performance assessment, Digital television
National Category
Signal Processing Computer Sciences
Identifiers
urn:nbn:se:bth-19049 (URN)10.1109/ISCIT.2019.8905158 (DOI)2-s2.0-85076222836 (Scopus ID)9781728150093 (ISBN)
Conference
19th International Symposium on Communications and Information Technologies, ISCIT, Ho Chi Minh City, 25 September 2019 through 27 September 2019
Available from: 2019-12-27 Created: 2019-12-27 Last updated: 2019-12-27Bibliographically approved
Tran, D. N. & Zepernick, H.-J. (2019). Spherical Light-Weight Data Hiding in 360-Degree Videos with Equirectangular Projection. In: International Conference on Advanced Technologies for Communications: . Paper presented at 12th International Conference on Advanced Technologies for Communications, ATC, Hanoi, 17 October 2019 through 19 October 2019 (pp. 56-62). IEEE Computer Society
Open this publication in new window or tab >>Spherical Light-Weight Data Hiding in 360-Degree Videos with Equirectangular Projection
2019 (English)In: International Conference on Advanced Technologies for Communications, IEEE Computer Society , 2019, p. 56-62Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we propose a spherical light-weight data hiding technique for 360-degree videos with equirectangular projection between sphere and plane. In particular, computationally efficient least significant bit (LSB) data hiding is applied to the color encoded equirectangular projection of the sphere. As viewers put more attention to the areas around the equator of a 360-degree video compared to the poles, LSB data hiding may be performed in the regions around the poles without causing perceptually significant quality degradation. In addition, the equirectangular projection induces a huge amount of data redundancy in the areas near the poles which increases the capacity available for LSB data hiding. A performance assessment of the proposed spherical light-weight data hiding technique is conducted using the weighted-to-spherically-uniform peak-signal-to-noise ratio (WS-PSNR) and the Craster parabolic projection PSNR (CPP-PSNR). Because both metrics take the non-linear relationship between samples on the sphere and the samples mapped to the plane into account, they are well suited for assessing the performance of the spherical LSB data hiding technique. Numerical results are provided for scenarios in which a 360-degree cover video carries a secret video using different numbers of bit planes. It is shown that video fidelity in terms of WS-PSNR and CPP-PSNR is indeed kept high in the 360-degree stego-video as long as the LSB data hiding is performed in the areas around the poles. © 2019 IEEE.

Place, publisher, year, edition, pages
IEEE Computer Society, 2019
Keywords
360-degree video, CPP-PSNR, equirectangular projection, LSB data hiding, WS-PSNR, Poles, Signal to noise ratio, Spheres, Computationally efficient, Data hiding, Least significant bits, Non-linear relationships, Peak signal to noise ratio, Steganography
National Category
Computer Sciences Communication Systems
Identifiers
urn:nbn:se:bth-19141 (URN)10.1109/ATC.2019.8924565 (DOI)2-s2.0-85077542044 (Scopus ID)9781728123929 (ISBN)
Conference
12th International Conference on Advanced Technologies for Communications, ATC, Hanoi, 17 October 2019 through 19 October 2019
Available from: 2020-01-23 Created: 2020-01-23 Last updated: 2020-01-23Bibliographically approved
Chu, T. M., Zepernick, H.-J. & Sundstedt, V. (2018). Analysis of Variance of Opinion Scores for MPEG-4 Scalable and Advanced Video Coding. In: Wysocki, TA Wysocki, BJ (Ed.), 2018 12TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS): . Paper presented at 12th International Conference on Signal Processing and Communication Systems (ICSPCS), Cairns,DEC 17-19. IEEE
Open this publication in new window or tab >>Analysis of Variance of Opinion Scores for MPEG-4 Scalable and Advanced Video Coding
2018 (English)In: 2018 12TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS) / [ed] Wysocki, TA Wysocki, BJ, IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we conduct an analysis of variance (ANOVA) on opinion scores for MPEG-4 scalable video coding (SVC) and advanced video coding (AVC) standards. This work resorts on a publicly available database providing opinion scores from subjective experiments for several scenarios such as different bit rates and resolutions. In particular, ANOVA is used for statistical hypothesis testing to compare two or more sets of opinion scores instead of being constrained to pairs of sets of opinion scores as would be the case for t-tests. As the ANOVA tests of the different scenarios are performed for mean opinion scores (MOS), box plots are also provided in order to assess the distribution of the opinion scores around the median. It is shown that the opinion scores given to the reference videos in SVC and AVC for different resolutions are statistically significantly similar regardless of the content. Further, for the opinion scores of the considered database, the ANOVA tests support the hypothesis that AVC generally outperforms SVC although the performance difference may be less pronounced for higher bit rates. This work also shows that additional insights on the results of subjective experiments can be obtained by extending the analysis of opinion scores beyond MOS to ANOVA tests and box plots.

Place, publisher, year, edition, pages
IEEE, 2018
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-17694 (URN)000458665600006 ()
Conference
12th International Conference on Signal Processing and Communication Systems (ICSPCS), Cairns,DEC 17-19
Funder
Knowledge Foundation, 20170056
Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-04-05Bibliographically approved
Chu, T. M. & Zepernick, H.-J. (2018). Downlink outage analysis for cognitive cooperative radio networks employing non-orthogonal multiple access. In: 2018 IEEE 7th International Conference on Communications and Electronics, ICCE 2018: . Paper presented at 7th IEEE International Conference on Communications and Electronics, ICCE 2018,Saigon Morin HotelHue; Viet Nam, 18 July 2018 through 20 July 2018 (pp. 27-32). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Downlink outage analysis for cognitive cooperative radio networks employing non-orthogonal multiple access
2018 (English)In: 2018 IEEE 7th International Conference on Communications and Electronics, ICCE 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 27-32Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we employ power-domain non-orthogonal multiple access (NOMA) to simultaneously transmit signals to both a primary user (PU) and a secondary user (SU) of a cognitive cooperative radio network (CCRN). Higher priority is given to the PU over the SU by keeping the power allocation coefficients at the base station (BS) and relay (R) above a certain threshold. In this way, similar as the interference power limit imposed by the PU in a conventional underlay CCRN, the power allocation coefficients at the BS and R of the CCRN can be controlled to maintain a given outage performance. Analytical expressions of the cumulative distribution function of the end-to-end signal-to-interference-plus-noise ratios at the PU and SU are derived and then used to assess the outage probabilities of both users. Numerical results are presented to study the impact of system parameters on outage performance of the CCRN with power-domain NOMA. In addition, it is illustrated that increased downlink performance can be obtained by combining power-domain NOMA with CCRNs. © 2018 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Cognitive radio, Distribution functions, Mobile telecommunication systems, Probability distributions, Signal to noise ratio, Analytical expressions, Cognitive cooperative radio networks, Cumulative distribution function, Downlink performance, Interference power, Non orthogonal multiple accesses (NOMA), Non-orthogonal multiple access, Signal to interference plus noise ratio, Outages
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-17426 (URN)10.1109/CCE.2018.8465755 (DOI)2-s2.0-85057577602 (Scopus ID)9781538636787 (ISBN)
Conference
7th IEEE International Conference on Communications and Electronics, ICCE 2018,Saigon Morin HotelHue; Viet Nam, 18 July 2018 through 20 July 2018
Available from: 2018-12-13 Created: 2018-12-13 Last updated: 2018-12-13Bibliographically approved
Chu, T. M. & Zepernick, H.-J. (2018). Non-orthogonal multiple access for DF cognitive cooperative radio networks. In: IEEE International Conference on Communications Workshops: . Paper presented at IEEE International Conference on Communications Workshops, ICC Workshops 2018; Kansas City (pp. 1-6). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Non-orthogonal multiple access for DF cognitive cooperative radio networks
2018 (English)In: IEEE International Conference on Communications Workshops, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 1-6Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we study a power domain non-orthogonal multiple access (NOMA) scheme for cognitive cooperative radio networks (CCRNs). In the proposed scheme, a secondary transmitter communicates with two secondary users (SUs) by allocating transmit powers inversely proportional to the channel power gains on the links to the respective SUs. A decode-and-forward (DF) secondary relay is deployed which decodes the superimposed signals associated with the two SUs. Then, power domain NOMA is used to forward the signals from the relay to the two SUs based on the channel power gains on the corresponding two links. Mathematical expressions for the outage probability and ergodic capacity of each SU and the overall power domain NOMA CCRN are derived. Numerical results are provided to reveal the impact of the power allocation coefficients at the secondary transmitter and secondary relay, the interference power threshold at the primary receiver, and the normalized distances of the SUs on the outage probability and ergodic capacity of each SU and the whole NOMA system. © 2018 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Series
IEEE International Conference on Communications Workshops, ISSN 2164-7038
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-16905 (URN)10.1109/ICCW.2018.8403614 (DOI)000445022200128 ()2-s2.0-85050303770 (Scopus ID)9781538643280 (ISBN)
Conference
IEEE International Conference on Communications Workshops, ICC Workshops 2018; Kansas City
Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2018-10-18Bibliographically approved
Tran, D. N., Zepernick, H.-J. & Chu, T. M. (2018). On Moderately Significant Bit Data Hiding Techniques for High-Definition Images. In: International Conference on Advanced Technologies for Communications: . Paper presented at 11th International Conference on Advanced Technologies for Communications, ATC 2018, Ho Chi Minh City, 18 October 2018 through 20 October 2018 (pp. 47-52). IEEE Computer Society
Open this publication in new window or tab >>On Moderately Significant Bit Data Hiding Techniques for High-Definition Images
2018 (English)In: International Conference on Advanced Technologies for Communications, IEEE Computer Society , 2018, p. 47-52Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we study moderately significant bit data hiding techniques for high-definition (HD) images. In contrast to least significant bit data hiding, we explore the potential of HD images to engage higher order bits for increasing the capacity of hiding secret images. In particular, the number of secret images embedded in moderately significant bits of a given cover image is successively increased to study the impact of this data hiding approach on image fidelity and image quality in the context of HD images. A comprehensive performance assessment is conducted on the stego-image carrying the secret images in terms of peak-signal-to-noise ratio (PSNR) and structural similarity (SSIM) index. It is shown that HD images indeed offer the potential of hiding several images within certain image fidelity and objective perceptual image quality constraints of the resulting stego-HD images. © 2018 IEEE.

Place, publisher, year, edition, pages
IEEE Computer Society, 2018
Keywords
Image quality, Signal to noise ratio, Steganography, Comprehensive performance assessments, High definition, Image fidelity, Least significant bits, Peak signal to noise ratio, Perceptual image quality, Secret images, Structural similarity indices (SSIM), Digital television
National Category
Communication Systems
Identifiers
urn:nbn:se:bth-17622 (URN)10.1109/ATC.2018.8587484 (DOI)000458771800010 ()2-s2.0-85060813550 (Scopus ID)9781538661130 (ISBN)
Conference
11th International Conference on Advanced Technologies for Communications, ATC 2018, Ho Chi Minh City, 18 October 2018 through 20 October 2018
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-03-08Bibliographically approved
Tran, D. N., Zepernick, H.-J. & Chu, T. M. (2018). On the Positioning of Moderately Significant Bit Data Hiding in High-Definition Images. In: Wysocki, TA Wysocki, BJ (Ed.), 2018 12TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS): . Paper presented at 12th International Conference on Signal Processing and Communication Systems (ICSPCS, Cairns, DEC 17-19. IEEE
Open this publication in new window or tab >>On the Positioning of Moderately Significant Bit Data Hiding in High-Definition Images
2018 (English)In: 2018 12TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS) / [ed] Wysocki, TA Wysocki, BJ, IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Mobile services have seen a shift from voice services toward visual stimuli-based services ranging from mobile imaging over mobile gaming to upcoming mobile extended reality applications. In this paper, given the increased resolutions of the related mobile multimedia formats, we propose and examine positioning strategies for light-weight data hiding of secret images in moderately significant bits of high-definition (HD) cover images. Apart from linear and random positioning, visual attention mechanisms of the human visual system are addressed by separately utilizing either the background or center of the HD cover image for data hiding. A performance assessment of these positioning strategies is conducted in terms of the peak-signal-to-noise ratio (PSNR), structural similarity (SSIM) index, and visual information fidelity (VIF). It is shown that HD cover images indeed can carry more than a single secret image until noticeable quality loss is observed. Further, it is revealed that linear positioning of secret images in the whole, background, or center of HD cover images outperforms random positioning. As for the utilized performance metrics, it has been observed that PSNR cannot differentiate among the positioning strategies as it measures pixel-by-pixel differences and hence removes the impact of the position of the hidden data. As for the two quality metrics, compared to the SSIM index, VIF is found to stronger differentiate among the performance of the considered positioning strategies.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
LSB SUBSTITUTION; QUALITY; PSNR
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-17693 (URN)000458665600008 ()978-1-5386-5602-0 (ISBN)
Conference
12th International Conference on Signal Processing and Communication Systems (ICSPCS, Cairns, DEC 17-19
Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-04-05Bibliographically approved
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