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2D/3D freeview video generation for 3DTV system / Dongbo Min in Signal processing. Image communication, Vol. 24 N° 1/2 (Janvier 2009)

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[article]
in Signal processing. Image communication > Vol. 24 N° 1/2 (Janvier 2009) . - pp. 31-48
Titre : 2D/3D freeview video generation for 3DTV system
Type de document : texte imprimé
Auteurs : Dongbo Min, Auteur ; Donghyun Kim, Auteur ; SangUn Yun, Auteur
Article en page(s) : pp. 31-48
Note générale : Electronique
Langues : Anglais (eng)
Mots-clés : Occlusion handling Semi-N-view & N-depth framework Stereo matching Virtual view rendering
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : In this paper, we present a new method of synthesizing novel views from the virtual cameras in multiview camera configurations for three-dimensional TV (3DTV) system.
We introduce a semi-N-view & N-depth framework in order to estimate disparity maps efficiently and correctly.
This framework reduces redundancy on disparity estimation by using information from neighboring views.
N views can be classified as reference and target images.
The disparity maps on the reference images are only estimated by using the cost aggregation method with the weighted least square.
The cost functions on the target images are computed by the proposed warping technique so that significant reduction of computation loads is possible.
The occlusion problem, which significantly affects the quality of virtual view rendering, is handled by using cost functions computed with multiview images.
The proposed method provides a 2D/3D freeview video for 3DTV system.
User can select 2D/3D modes of freeview video and control 3D depth perception by adjusting several parameters in 3D freeview video.
Experimental results show that the proposed method yields the accurate disparity maps and the synthesized novel view is satisfactory enough to provide seamless freeview videos for 3DTV system.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

[article] 2D/3D freeview video generation for 3DTV system [texte imprimé] / Dongbo Min, Auteur ; Donghyun Kim, Auteur ; SangUn Yun, Auteur . - pp. 31-48.
Electronique
Langues : Anglais (eng)
in Signal processing. Image communication > Vol. 24 N° 1/2 (Janvier 2009) . - pp. 31-48
Mots-clés : Occlusion handling Semi-N-view & N-depth framework Stereo matching Virtual view rendering
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : In this paper, we present a new method of synthesizing novel views from the virtual cameras in multiview camera configurations for three-dimensional TV (3DTV) system.
We introduce a semi-N-view & N-depth framework in order to estimate disparity maps efficiently and correctly.
This framework reduces redundancy on disparity estimation by using information from neighboring views.
N views can be classified as reference and target images.
The disparity maps on the reference images are only estimated by using the cost aggregation method with the weighted least square.
The cost functions on the target images are computed by the proposed warping technique so that significant reduction of computation loads is possible.
The occlusion problem, which significantly affects the quality of virtual view rendering, is handled by using cost functions computed with multiview images.
The proposed method provides a 2D/3D freeview video for 3DTV system.
User can select 2D/3D modes of freeview video and control 3D depth perception by adjusting several parameters in 3D freeview video.
Experimental results show that the proposed method yields the accurate disparity maps and the synthesized novel view is satisfactory enough to provide seamless freeview videos for 3DTV system.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

3DTV view generation using uncalibrated pure rotating and zooming cameras / Songkran Jarusirisawad in Signal processing. Image communication, Vol. 24 N° 1/2 (Janvier 2009)

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[article]
in Signal processing. Image communication > Vol. 24 N° 1/2 (Janvier 2009) . - pp. 17-30
Titre : 3DTV view generation using uncalibrated pure rotating and zooming cameras
Type de document : texte imprimé
Auteurs : Songkran Jarusirisawad, Auteur ; Hideo Saito, Auteur
Article en page(s) : pp. 17-30
Note générale : Electronique
Langues : Anglais (eng)
Mots-clés : Free viewpoint video View interpolation Projective grid space Trifocal tensor
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : This paper proposes a novel method for synthesizing free viewpoint video captured by uncalibrated pure rotating and zooming cameras.
Neither intrinsic nor extrinsic parameters of our cameras are known.
Projective grid space (PGS), which is the 3D space defined by the epipolar geometry of two basis cameras, is employed for weak camera calibration.
Trifocal tensors are used to relate non-basis cameras to PGS.
Given trifocal tensors in the initial frame, our method automatically computes trifocal tensors in the other frames.
Scale invariant feature transform (SIFT) is used for finding corresponding points in a natural scene between the initial frame and the other frames.
Finally, free viewpoint video is synthesized based on the reconstructed visual hull.
In the experimental results, free viewpoint video captured by uncalibrated hand-held cameras is successfully synthesized using the proposed method.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

[article] 3DTV view generation using uncalibrated pure rotating and zooming cameras [texte imprimé] / Songkran Jarusirisawad, Auteur ; Hideo Saito, Auteur . - pp. 17-30.
Electronique
Langues : Anglais (eng)
in Signal processing. Image communication > Vol. 24 N° 1/2 (Janvier 2009) . - pp. 17-30
Mots-clés : Free viewpoint video View interpolation Projective grid space Trifocal tensor
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : This paper proposes a novel method for synthesizing free viewpoint video captured by uncalibrated pure rotating and zooming cameras.
Neither intrinsic nor extrinsic parameters of our cameras are known.
Projective grid space (PGS), which is the 3D space defined by the epipolar geometry of two basis cameras, is employed for weak camera calibration.
Trifocal tensors are used to relate non-basis cameras to PGS.
Given trifocal tensors in the initial frame, our method automatically computes trifocal tensors in the other frames.
Scale invariant feature transform (SIFT) is used for finding corresponding points in a natural scene between the initial frame and the other frames.
Finally, free viewpoint video is synthesized based on the reconstructed visual hull.
In the experimental results, free viewpoint video captured by uncalibrated hand-held cameras is successfully synthesized using the proposed method.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

Adaptation–aware encryption of scalable H.264/AVC video for content security / H. Kodikara Arachchi in Signal processing. Image communication, Vol. 24 N° 6 (Juillet 2009)

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[article]
in Signal processing. Image communication > Vol. 24 N° 6 (Juillet 2009) . - pp. 468-483
Titre : Adaptation–aware encryption of scalable H.264/AVC video for content security
Type de document : texte imprimé
Auteurs : H. Kodikara Arachchi, Auteur ; X. Perramon, Auteur ; S. Dogan, Auteur
Article en page(s) : pp. 468-483
Note générale : Electronique
Langues : Anglais (eng)
Mots-clés : End-to-end secure content adaptation Content–aware encryption Video adaptation H.264/SVC Initialisation vector
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : Data encryption is one of the key information security technologies used for safeguarding multimedia content from unauthorised access and manipulation in end-to-end delivery and access chains.
This technology, combined with the appropriate cryptographic methods, effectively prevents the content against malicious attacks, so as to protect its authenticity as well as integrity.
While encryption-based security is ensuring the authorised consumption of the multimedia content, content adaptation technologies have the primary goal of providing means for wider dissemination of the content across diverse networks, devices and users, and thus enriching user satisfaction and experience of the delivered content within a given set of usage environment constraints.
Traditionally, protected contents can only be adapted at trusted adaptation engines residing between the source and end-users, since they have to be fully decrypted before performing the necessary adaptation operations.
The drawback of such a process is that it significantly limits the availability and flexibility of adaptation engines applicable for adapting protected contents on the fly.
Thus, this paper proposes a novel scalable H.264/advanced video coding (AVC)-compatible video encryption technique, which is also transparent to adaptation engines in an end-to-end video delivery scenario.
The proposed technology relies on keeping syntax elements required for performing the adaptation operations clear (i.e., not encrypted).
The effectiveness of the proposed technique has been successfully verified in scenarios, where both conventional joint scalable video model (JSVM) bit stream extracting and random packet dropping mechanisms are used.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

[article] Adaptation–aware encryption of scalable H.264/AVC video for content security [texte imprimé] / H. Kodikara Arachchi, Auteur ; X. Perramon, Auteur ; S. Dogan, Auteur . - pp. 468-483.
Electronique
Langues : Anglais (eng)
in Signal processing. Image communication > Vol. 24 N° 6 (Juillet 2009) . - pp. 468-483
Mots-clés : End-to-end secure content adaptation Content–aware encryption Video adaptation H.264/SVC Initialisation vector
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : Data encryption is one of the key information security technologies used for safeguarding multimedia content from unauthorised access and manipulation in end-to-end delivery and access chains.
This technology, combined with the appropriate cryptographic methods, effectively prevents the content against malicious attacks, so as to protect its authenticity as well as integrity.
While encryption-based security is ensuring the authorised consumption of the multimedia content, content adaptation technologies have the primary goal of providing means for wider dissemination of the content across diverse networks, devices and users, and thus enriching user satisfaction and experience of the delivered content within a given set of usage environment constraints.
Traditionally, protected contents can only be adapted at trusted adaptation engines residing between the source and end-users, since they have to be fully decrypted before performing the necessary adaptation operations.
The drawback of such a process is that it significantly limits the availability and flexibility of adaptation engines applicable for adapting protected contents on the fly.
Thus, this paper proposes a novel scalable H.264/advanced video coding (AVC)-compatible video encryption technique, which is also transparent to adaptation engines in an end-to-end video delivery scenario.
The proposed technology relies on keeping syntax elements required for performing the adaptation operations clear (i.e., not encrypted).
The effectiveness of the proposed technique has been successfully verified in scenarios, where both conventional joint scalable video model (JSVM) bit stream extracting and random packet dropping mechanisms are used.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

Adaptive two-stage FEC scheme for scalable video transmission over wireless networks / Yufeng Shan in Signal processing. Image communication, Vol. 24 N° 9 (Octobre 2009)

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[article]
in Signal processing. Image communication > Vol. 24 N° 9 (Octobre 2009) . - pp. 718-729
Titre : Adaptive two-stage FEC scheme for scalable video transmission over wireless networks
Type de document : texte imprimé
Auteurs : Yufeng Shan, Auteur ; Su Yi, Auteur ; Shivkumar Kalyanaraman, Auteur
Article en page(s) : pp. 718-729
Note générale : Electronique
Langues : Anglais (eng)
Mots-clés : Wireless FEC Video streaming Cross-layer Scalable
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : In this paper, we present a two-stage forward error correction (FEC) scheme with an enhanced link-layer protocol especially for multimedia data transmission over wireless LANs.
At the application layer, packet-level FEC (stage-one) is added across packets to correct packet losses due to congestion and route disruption.
Bit-level FEC (stage-two) is then added to both application packets and stage-one FEC packets to recover bit errors from the link layer.
Then at the link layer, header-CRC/FEC is used to enhance protection and to cooperate with the two-stage FEC scheme.
The proposed scheme thus provides joint protection across the protocol stack.
We explore both its bandwidth efficiency and video performance for the highly efficient and scalable MC-EZBC video codec using the network simulator ns-2.
Our results show that the proposed scheme can effectively increase application-layer throughput, reduce both end-to-end transmission delay and application bandwidth fluctuation, and significantly improve video performance.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

[article] Adaptive two-stage FEC scheme for scalable video transmission over wireless networks [texte imprimé] / Yufeng Shan, Auteur ; Su Yi, Auteur ; Shivkumar Kalyanaraman, Auteur . - pp. 718-729.
Electronique
Langues : Anglais (eng)
in Signal processing. Image communication > Vol. 24 N° 9 (Octobre 2009) . - pp. 718-729
Mots-clés : Wireless FEC Video streaming Cross-layer Scalable
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : In this paper, we present a two-stage forward error correction (FEC) scheme with an enhanced link-layer protocol especially for multimedia data transmission over wireless LANs.
At the application layer, packet-level FEC (stage-one) is added across packets to correct packet losses due to congestion and route disruption.
Bit-level FEC (stage-two) is then added to both application packets and stage-one FEC packets to recover bit errors from the link layer.
Then at the link layer, header-CRC/FEC is used to enhance protection and to cooperate with the two-stage FEC scheme.
The proposed scheme thus provides joint protection across the protocol stack.
We explore both its bandwidth efficiency and video performance for the highly efficient and scalable MC-EZBC video codec using the network simulator ns-2.
Our results show that the proposed scheme can effectively increase application-layer throughput, reduce both end-to-end transmission delay and application bandwidth fluctuation, and significantly improve video performance.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

All phase biorthogonal transform and its application in JPEG-like image compression / Zheng-Xin Hou in Signal processing. Image communication, Vol. 24 N° 10 (Novembre 2009)

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ISBD

[article]
in Signal processing. Image communication > Vol. 24 N° 10 (Novembre 2009) . - pp. 791-802
Titre : All phase biorthogonal transform and its application in JPEG-like image compression
Type de document : texte imprimé
Auteurs : Zheng-Xin Hou, Auteur ; Cheng-You Wang, Auteur ; Ai-Ping Yang, Auteur
Article en page(s) : pp. 791-802
Note générale : Electronique
Langues : Anglais (eng)
Mots-clés : Biorthogonal transform Image compression JPEG algorithm All phase biorthogonal transform (APBT) Dual biorthogonal basis vectors Walsh transform (WT) Discrete cosine transform (DCT) Inverse discrete cosine transform (IDCT) Peak signal to noise ratio (PSNR)
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : This paper proposes new concepts of the all phase biorthogonal transform (APBT) and the dual biorthogonal basis vectors.
In the light of all phase digital filtering theory, three kinds of all phase biorthogonal transforms based on the Walsh transform (WT), the discrete cosine transform (DCT) and the inverse discrete cosine transform (IDCT) are proposed.
The matrices of APBT based on WT, DCT and IDCT are deduced, which can be used in image compression instead of the conventional DCT.
Compared with DCT-based JPEG (DCT-JPEG) image compression algorithm at the same bit rates, the PSNR and visual quality of the reconstructed images using these transforms are approximate to DCT, outgoing DCT-JPEG at low bit rates especially.
But the advantage is that the quantization table is simplified and the transform coefficients can be quantized uniformly.
Therefore, the computing time becomes shorter and the hardware implementation easier.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

[article] All phase biorthogonal transform and its application in JPEG-like image compression [texte imprimé] / Zheng-Xin Hou, Auteur ; Cheng-You Wang, Auteur ; Ai-Ping Yang, Auteur . - pp. 791-802.
Electronique
Langues : Anglais (eng)
in Signal processing. Image communication > Vol. 24 N° 10 (Novembre 2009) . - pp. 791-802
Mots-clés : Biorthogonal transform Image compression JPEG algorithm All phase biorthogonal transform (APBT) Dual biorthogonal basis vectors Walsh transform (WT) Discrete cosine transform (DCT) Inverse discrete cosine transform (IDCT) Peak signal to noise ratio (PSNR)
Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs
Résumé : This paper proposes new concepts of the all phase biorthogonal transform (APBT) and the dual biorthogonal basis vectors.
In the light of all phase digital filtering theory, three kinds of all phase biorthogonal transforms based on the Walsh transform (WT), the discrete cosine transform (DCT) and the inverse discrete cosine transform (IDCT) are proposed.
The matrices of APBT based on WT, DCT and IDCT are deduced, which can be used in image compression instead of the conventional DCT.
Compared with DCT-based JPEG (DCT-JPEG) image compression algorithm at the same bit rates, the PSNR and visual quality of the reconstructed images using these transforms are approximate to DCT, outgoing DCT-JPEG at low bit rates especially.
But the advantage is that the quantization table is simplified and the transform coefficients can be quantized uniformly.
Therefore, the computing time becomes shorter and the hardware implementation easier.
DEWEY : 361.382
ISSN : 0923-5965
En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]

An asymmetric post-processing for correspondence problem / Dongbo Min in Signal processing. Image communication, Vol. 25 N° 2 (02 EX.) (Février 2010)

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An efficient high-dimensional indexing method for content-based retrieval in large image databases / I. Daoudi in Signal processing. Image communication, Vol. 24 N° 10 (Novembre 2009)

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An efficient optimisation scheme for scalable surveillance centric video communications / Naeem Ramzan in Signal processing. Image communication, Vol. 24 N° 6 (Juillet 2009)

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An efficient retinex-like brightness normalization method for coding camera flashes and strong brightness variation in videos / Hoi-Kok Cheung in Signal processing. Image communication, Vol. 25 N° 3 (02 ex.) (Mars 2010)

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An efficient VLSI architecture for CBAC of AVS HDTV decoder / Junhao Zheng in Signal processing. Image communication, Vol. 24 N° 4 (Avril 2009)

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An integrated approach to summarization and adaptation using H.264/MPEG-4 SVC / Luis Herranz in Signal processing. Image communication, Vol. 24 N° 6 (Juillet 2009)

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AVS trick modes for PVR and VOD services / Zhijie Yang in Signal processing. Image communication, Vol. 24 N° 4 (Avril 2009)

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Combined adaptive-fixed interpolation with multi-directional filters / Zhongmou Wu in Signal processing. Image communication, Vol. 24 N° 4 (Avril 2009)

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Compressed domain indexing of scalable H.264/SVC streams / Christian Käs in Signal processing. Image communication, Vol. 24 N° 6 (Juillet 2009)

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Context-based entropy coding in AVS video coding standard / Zhang, Li. in Signal processing. Image communication, Vol. 24 N° 4 (Avril 2009)

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Détail de l'indexation

621.382 : Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs

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