Dither modulation: a new approach to digital watermarking and information embedding

1999 ◽  
Author(s):  
Brian Chen ◽  
Gregory W. Wornell
Keyword(s):  
Digital Watermarking ◽  
New Approach ◽  
Information Embedding ◽  
Dither Modulation

scholarly journals Speech Watermarking for Tampering Detection Based on Modifications to LSFs

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Xiangning Chen ◽  
Weitao Yuan ◽  
Shengbei Wang ◽  
Chao Wang ◽  
Lin Wang
Keyword(s):  
Auditory System ◽  
Digital Watermarking ◽  
Linear Prediction ◽  
Speech Signals ◽  
Quantization Index Modulation ◽  
Tampering Detection ◽  
Speech Watermarking ◽  
Dither Modulation ◽  
Detection Approach ◽  
Index Modulation

There have been serious issues concerning the protection of speech signals from malicious tampering. Digital watermarking has been paid much attention in solving this problem. This paper proposes a tampering detection approach based on speech watermarking by modifying the line spectral frequencies (LSFs). Watermarks are embedded into LSFs that derived from linear prediction (LP) analysis with dither modulation-quantization index modulation (DM-QIM). Minor modifications to LSFs introduced by quantization not only enable the watermarks to be inaudible to human auditory system but also provide the possibility of robustness against meaningful processing and fragility against tampering. We evaluated the proposed approach with objective evaluations with respect to inaudibility, robustness, and fragility. The results indicated that the proposed approach for tampering detection not only satisfied inaudibility but also provided good robustness against meaningful processing and fragility against malicious tampering.

scholarly journals Blind digital watermarking in PDF documents using Spread Transform Dither Modulation

2015 ◽  
Vol 76 (1) ◽  
pp. 143-161 ◽  
Author(s):  
Ahmad W. Bitar ◽  
Rony Darazi ◽  
Jean-François Couchot ◽  
Raphaël Couturier
Keyword(s):  
Digital Watermarking ◽  
Dither Modulation ◽  
Spread Transform Dither Modulation

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

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