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Tatouage robuste de vidéo basé sur la notion de régions d'intérêtKoubaa, Mohamed 23 November 2010 (has links)
Le travail présenté dans ce mémoire a pour objectif le développement de nouvelles approches permettant d'introduire de manière robuste des marques dans une vidéo. Il s'agira tout d'abord de sélectionner les zones des images les plus appropriées à l'introduction du tatouage. Pour cela, plusieurs critères devront être pris en compte. Tout d'abord, lorsqu'une marque est introduite dans une zone de l'image, il est nécessaire d'introduire la même marque au même endroit sur toutes les images de la séquence. En effet, dans le cas contraire, un simple filtrage temporel dans le sens du mouvement permet de détruire la marque. Il sera également important de détecter les zones moins importantes visuellement dans lesquelles des modifications pourraient être introduites plus facilement sans qu'elles soient visibles. Il s'agit notamment des zones visibles dans peu d'images différentes, ou des zones ou l'œil humain est peu susceptible de détecter des différences, telles que les zones d'ombres en mouvement. Pour parvenir à une détection efficace de telles régions, une phase d'analyse permettant notamment la création d'images mosaïques (ou sprite dans le contexte MPEG-4) et la détection des ombres en mouvement devra être réalisée. / The work presented in this thesis aims to develop new approaches to introduce, in a robust way, a marks in a video. The areas of the images which are most appropriate to the introduction of the tattoo should be selected. For that, several criteria must be taken into account. Firstly, when a mark is introduced into an area of the image, it is necessary to introduce the same mark at the same location on all images in the sequence. It is also important to detect an invisible areas where changes could be introduced easily without being seen. These are areas where the human eye is less sensitive to changes, such as shadows region of moving objects. To achieve the e#ective detection of such regions, a phase of analysis including the creation of mosaic images and the detection of shadows of moving objects will be realized.
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Digital Video Watermarking Robust to Geometric Attacks and CompressionsLiu, Yan 03 October 2011 (has links)
This thesis focuses on video watermarking robust against geometric attacks and
video compressions. In addition to the requirements for an image watermarking algorithm,
a digital video watermarking algorithm has to be robust against advanced
video compressions, frame loss, frame swapping, aspect ratio change, frame rate change,
intra- and inter-frame filtering, etc. Video compression, especially, the most efficient
compression standard, H.264, and geometric attacks, such as rotation and cropping,
frame aspect ratio change, and translation, are considered the most challenging attacks
for video watermarking algorithms.
In this thesis, we first review typical watermarking algorithms robust against geometric
attacks and video compressions, and point out their advantages and disadvantages.
Then, we propose our robust video watermarking algorithms against Rotation,
Scaling and Translation (RST) attacks and MPEG-2 compression based on the logpolar
mapping and the phase-only filtering method. Rotation or scaling transformation
in the spatial domain results in vertical or horizontal shift in the log-polar mapping
(LPM) of the magnitude of the Fourier spectrum of the target frame. Translation has
no effect in this domain. This method is very robust to RST attacks and MPEG-2
compression. We also demonstrate that this method can be used as a RST parameters
detector to work with other watermarking algorithms to improve their robustness to
RST attacks.
Furthermore, we propose a new video watermarking algorithm based on the 1D
DFT (one-dimensional Discrete Fourier Transform) and 1D projection. This algorithm
enhances the robustness to video compression and is able to resist the most advanced video compression, H.264. The 1D DFT for a video sequence along the temporal domain
generates an ideal domain, in which the spatial information is still kept and the
temporal information is obtained. With detailed analysis and calculation, we choose
the frames with highest temporal frequencies to embed the fence-shaped watermark
pattern in the Radon transform domain of the selected frames. The performance of the
proposed algorithm is evaluated by video compression standards MPEG-2 and H.264;
geometric attacks such as rotation, translation, and aspect-ratio changes; and other
video processing. The most important advantages of this video watermarking algorithm
are its simplicity, practicality and robustness.
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Digital Video Watermarking Robust to Geometric Attacks and CompressionsLiu, Yan 03 October 2011 (has links)
This thesis focuses on video watermarking robust against geometric attacks and
video compressions. In addition to the requirements for an image watermarking algorithm,
a digital video watermarking algorithm has to be robust against advanced
video compressions, frame loss, frame swapping, aspect ratio change, frame rate change,
intra- and inter-frame filtering, etc. Video compression, especially, the most efficient
compression standard, H.264, and geometric attacks, such as rotation and cropping,
frame aspect ratio change, and translation, are considered the most challenging attacks
for video watermarking algorithms.
In this thesis, we first review typical watermarking algorithms robust against geometric
attacks and video compressions, and point out their advantages and disadvantages.
Then, we propose our robust video watermarking algorithms against Rotation,
Scaling and Translation (RST) attacks and MPEG-2 compression based on the logpolar
mapping and the phase-only filtering method. Rotation or scaling transformation
in the spatial domain results in vertical or horizontal shift in the log-polar mapping
(LPM) of the magnitude of the Fourier spectrum of the target frame. Translation has
no effect in this domain. This method is very robust to RST attacks and MPEG-2
compression. We also demonstrate that this method can be used as a RST parameters
detector to work with other watermarking algorithms to improve their robustness to
RST attacks.
Furthermore, we propose a new video watermarking algorithm based on the 1D
DFT (one-dimensional Discrete Fourier Transform) and 1D projection. This algorithm
enhances the robustness to video compression and is able to resist the most advanced video compression, H.264. The 1D DFT for a video sequence along the temporal domain
generates an ideal domain, in which the spatial information is still kept and the
temporal information is obtained. With detailed analysis and calculation, we choose
the frames with highest temporal frequencies to embed the fence-shaped watermark
pattern in the Radon transform domain of the selected frames. The performance of the
proposed algorithm is evaluated by video compression standards MPEG-2 and H.264;
geometric attacks such as rotation, translation, and aspect-ratio changes; and other
video processing. The most important advantages of this video watermarking algorithm
are its simplicity, practicality and robustness.
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Digital Video Watermarking Robust to Geometric Attacks and CompressionsLiu, Yan 03 October 2011 (has links)
This thesis focuses on video watermarking robust against geometric attacks and
video compressions. In addition to the requirements for an image watermarking algorithm,
a digital video watermarking algorithm has to be robust against advanced
video compressions, frame loss, frame swapping, aspect ratio change, frame rate change,
intra- and inter-frame filtering, etc. Video compression, especially, the most efficient
compression standard, H.264, and geometric attacks, such as rotation and cropping,
frame aspect ratio change, and translation, are considered the most challenging attacks
for video watermarking algorithms.
In this thesis, we first review typical watermarking algorithms robust against geometric
attacks and video compressions, and point out their advantages and disadvantages.
Then, we propose our robust video watermarking algorithms against Rotation,
Scaling and Translation (RST) attacks and MPEG-2 compression based on the logpolar
mapping and the phase-only filtering method. Rotation or scaling transformation
in the spatial domain results in vertical or horizontal shift in the log-polar mapping
(LPM) of the magnitude of the Fourier spectrum of the target frame. Translation has
no effect in this domain. This method is very robust to RST attacks and MPEG-2
compression. We also demonstrate that this method can be used as a RST parameters
detector to work with other watermarking algorithms to improve their robustness to
RST attacks.
Furthermore, we propose a new video watermarking algorithm based on the 1D
DFT (one-dimensional Discrete Fourier Transform) and 1D projection. This algorithm
enhances the robustness to video compression and is able to resist the most advanced video compression, H.264. The 1D DFT for a video sequence along the temporal domain
generates an ideal domain, in which the spatial information is still kept and the
temporal information is obtained. With detailed analysis and calculation, we choose
the frames with highest temporal frequencies to embed the fence-shaped watermark
pattern in the Radon transform domain of the selected frames. The performance of the
proposed algorithm is evaluated by video compression standards MPEG-2 and H.264;
geometric attacks such as rotation, translation, and aspect-ratio changes; and other
video processing. The most important advantages of this video watermarking algorithm
are its simplicity, practicality and robustness.
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Digital Video Watermarking Robust to Geometric Attacks and CompressionsLiu, Yan January 2011 (has links)
This thesis focuses on video watermarking robust against geometric attacks and
video compressions. In addition to the requirements for an image watermarking algorithm,
a digital video watermarking algorithm has to be robust against advanced
video compressions, frame loss, frame swapping, aspect ratio change, frame rate change,
intra- and inter-frame filtering, etc. Video compression, especially, the most efficient
compression standard, H.264, and geometric attacks, such as rotation and cropping,
frame aspect ratio change, and translation, are considered the most challenging attacks
for video watermarking algorithms.
In this thesis, we first review typical watermarking algorithms robust against geometric
attacks and video compressions, and point out their advantages and disadvantages.
Then, we propose our robust video watermarking algorithms against Rotation,
Scaling and Translation (RST) attacks and MPEG-2 compression based on the logpolar
mapping and the phase-only filtering method. Rotation or scaling transformation
in the spatial domain results in vertical or horizontal shift in the log-polar mapping
(LPM) of the magnitude of the Fourier spectrum of the target frame. Translation has
no effect in this domain. This method is very robust to RST attacks and MPEG-2
compression. We also demonstrate that this method can be used as a RST parameters
detector to work with other watermarking algorithms to improve their robustness to
RST attacks.
Furthermore, we propose a new video watermarking algorithm based on the 1D
DFT (one-dimensional Discrete Fourier Transform) and 1D projection. This algorithm
enhances the robustness to video compression and is able to resist the most advanced video compression, H.264. The 1D DFT for a video sequence along the temporal domain
generates an ideal domain, in which the spatial information is still kept and the
temporal information is obtained. With detailed analysis and calculation, we choose
the frames with highest temporal frequencies to embed the fence-shaped watermark
pattern in the Radon transform domain of the selected frames. The performance of the
proposed algorithm is evaluated by video compression standards MPEG-2 and H.264;
geometric attacks such as rotation, translation, and aspect-ratio changes; and other
video processing. The most important advantages of this video watermarking algorithm
are its simplicity, practicality and robustness.
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Digital video watermarking using singular value decomposition and two-dimensional principal component analysisKaufman, Jason R. 14 April 2006 (has links)
No description available.
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Watermarking For 3d RepresentationsKoz, Alper 01 August 2007 (has links) (PDF)
In this thesis, a number of novel watermarking techniques for different 3D representations are presented. A novel watermarking method is proposed for the mono-view video, which might be interpreted as the basic implicit representation of 3D scenes. The proposed method solves the common flickering problem in the existing video watermarking schemes by means of adjusting the watermark strength with respect to temporal contrast thresholds of human visual system (HVS), which define the maximum invisible distortions in the temporal direction. The experimental results indicate that the proposed method gives better results in both objective and subjective measures, compared to some recognized methods in the literature.
The watermarking techniques for the geometry and image based representations of 3D scenes, denoted as 3D watermarking, are examined and classified into three groups, as 3D-3D, 3D-2D and 2D-2D watermarking, in which the pair of symbols identifies whether the watermark is embedded-detected in a 3D model or a 2D projection of it. A detailed literature survey on 3D-3D watermarking is presented that mainly focuses on protection of the intellectual property rights of the 3D geometrical representations. This analysis points out the specific problems in 3D-3D geometry watermarking , such as the lack of a unique 3D scene representation, standardization for the coding schemes and benchmarking tools on 3D geometry watermarking.
For 2D-2D watermarking category, the copyright problem for the emerging free-view televisions (FTV) is introduced. The proposed watermarking method for this original problem embeds watermarks into each view of the multi-view video by utilizing the spatial sensitivity of HVS. The hidden signal in a selected virtual view is detected by computing the normalized correlation between the selected view and a generated pattern, namely rendered watermark, which is obtained by applying the same rendering operations which has occurred on the selected view to the original watermark. An algorithm for the estimation of the virtual camera position and rotation is also developed based on the projective planar relations between image planes. The simulation results show the applicability of the method to the FTV systems.
Finally, the thesis also presents a novel 3D-2D watermarking method, in which a watermark is embedded into 3-D representation of the object and detected from a 2-D projection (image) of the same model. A novel solution based on projective invariants is proposed which modifies the cross ratio of the five coplanar points on the 3D model according to the watermark bit and extracts the embedded bit from the 2D projections of the model by computing the cross-ratio. After presenting the applicability of the algorithm via simulations, the future directions for this novel problem for 3D watermarking are addressed.
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Comparative evaluation of video watermarking techniques in the uncompressed domainVan Huyssteen, Rudolph Hendrik 12 1900 (has links)
Thesis (MScEng)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: Electronic watermarking is a method whereby information can be imperceptibly
embedded into electronic media, while ideally being robust against common signal
manipulations and intentional attacks to remove the embedded watermark. This
study evaluates the characteristics of uncompressed video watermarking techniques
in terms of visual characteristics, computational complexity and robustness against
attacks and signal manipulations.
The foundations of video watermarking are reviewed, followed by a survey of
existing video watermarking techniques. Representative techniques from different
watermarking categories are identified, implemented and evaluated.
Existing image quality metrics are reviewed and extended to improve their performance
when comparing these video watermarking techniques. A new metric for
the evaluation of inter frame flicker in video sequences is then developed.
A technique for possibly improving the robustness of the implemented discrete
Fourier transform technique against rotation is then proposed. It is also shown that
it is possible to reduce the computational complexity of watermarking techniques
without affecting the quality of the original content, through a modified watermark
embedding method.
Possible future studies are then recommended with regards to further improving
watermarking techniques against rotation. / AFRIKAANSE OPSOMMING: ’n Elektroniese watermerk is ’n metode waardeur inligting onmerkbaar in elektroniese
media vasgelê kan word, met die doel dat dit bestand is teen algemene manipulasies
en doelbewuste pogings om die watermerk te verwyder. In hierdie navorsing
word die eienskappe van onsaamgeperste video watermerktegnieke ondersoek
in terme van visuele eienskappe, berekeningskompleksiteit en weerstandigheid teen
aanslae en seinmanipulasies.
Die onderbou van video watermerktegnieke word bestudeer, gevolg deur ’n oorsig
van reedsbestaande watermerktegnieke. Verteenwoordigende tegnieke vanuit verskillende
watermerkkategorieë word geïdentifiseer, geïmplementeer en geëvalueer.
Bestaande metodes vir die evaluering van beeldkwaliteite word bestudeer en uitgebrei
om die werkverrigting van die tegnieke te verbeter, spesifiek vir die vergelyking
van watermerktegnieke. ’n Nuwe stelsel vir die evaluering van tussenraampie flikkering
in video’s word ook ontwikkel.
’n Tegniek vir die moontlike verbetering van die geïmplementeerde diskrete Fourier
transform tegniek word voorgestel om die tegniek se bestandheid teen rotasie
te verbeter. Daar word ook aangetoon dat dit moontlik is om die berekeningskompleksiteit
van watermerktegnieke te verminder, sonder om die kwaliteit van die
oorspronklike inhoud te beïnvloed, deur die gebruik van ’n verbeterde watermerkvasleggingsmetode.
Laastens word aanbevelings vir verdere navorsing aangaande die verbetering van
watermerktegnieke teen rotasie gemaak.
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