extraction améliorée, ajout de mesure de qualité sur lena et quelques typos

diff --git a/emb.ps b/emb.ps
index 37a22055d07b54800fff5d213217fe882835ae6e..ff26651f25ecbd875d6d2b50fa7ae756570e372b 100644 (file)
--- a/emb.ps
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diff --git a/experiments.tex b/experiments.tex
index 9da4704046665ae6980ba9ba7ff4a47273f45ba0..8337d556b9ac715c1a7515c53a10eb84d173fd8a 100644 (file)
--- a/experiments.tex
+++ b/experiments.tex
@@ -7,7 +7,7 @@ this set of cover images since this paper is more focused on
 the methodology than benchmarking.    
 Our approach is always compared to Hugo~\cite{DBLP:conf/ih/PevnyFB10}
 and to EAISLSBMR~\cite{Luo:2010:EAI:1824719.1824720}.
-The former is the less detectable information hidding tool in spatial domain 
+The former is the less detectable information hiding tool in spatial domain 
 and the later is the work which is close to ours, as far as we know. 
 
 
@@ -35,6 +35,12 @@ The first one is widely used but does not take into
 account the Human Visual System (HVS).
 The other ones have been designed to tackle this problem.
 
+If we apply them on the running example, 
+the PSNR, PSNR-HVS-M, and wPSNR values are respectively equal to 
+68.39, 79.85, and 89.71 for the stego Lena when $b$ is equal to 7.
+If $b$ is 6, these values are respectively equal to 
+65.43, 77.2, and 89.35.
+
 
 
 

diff --git a/intro.tex b/intro.tex
index e385cc90080e4277e2210d203e669aae0c83424e..deecdb76e25e766a4216967ba442cf57c92f0f81 100644 (file)
--- a/intro.tex
+++ b/intro.tex
@@ -73,7 +73,7 @@ the most interesting
 approaches being detailed in~\cite{Luo:2010:EAI:1824719.1824720} and 
 in~\cite{DBLP:journals/eswa/ChenCL10}.
 In the former, the authors presents the Edge Adaptive
-Image Steganography based on lsb matching revisited further denoted as to 
+Image Steganography based on LSB matching revisited further denoted as to 
 EAISLSBMR. This approach selects sharper edge
  regions with respect 
 to a given embedding rate: the larger the number of bits to be embedded, the coarser
@@ -115,7 +115,7 @@ Doing so makes our steganographic protocol, to a certain extend, an asymmetric o
 
 To sum up, in this research work, well studied and experimented
 techniques of signal processing (adaptive edges detection), 
-coding theory (syndrome-treillis codes), and cryptography 
+coding theory (syndrome-trellis codes), and cryptography 
 (Blum-Goldwasser encryption protocol) are combined 
 to compute an efficient steganographic
 scheme, whose principal characteristic is to take into 

diff --git a/main.tex b/main.tex
index 42afe92910905f6d285074f7cd294e90957458fa..5a7e01e23c07fc0f018ea8527b1cc5301809cf2d 100755 (executable)
--- a/main.tex
+++ b/main.tex
@@ -80,14 +80,14 @@ edge-based steganographic approach}
 
 
 %IEEEtran, journal, \LaTeX, paper, template.
-\keywords{Steganography, least-significant-bit (LSB)-based steganography, edge detection, Canny filter, security, syndrome treillis code}
+\keywords{Steganography, least-significant-bit (LSB)-based steganography, edge detection, Canny filter, security, syndrome trellis code}
 
 
 
 
 \abstracttext{A novel steganographic method called STABYLO is introduced in 
 this research work.
-Its main avantage for being is to be much lighter than the so-called
+Its main advantage for being is to be much lighter than the so-called
 Highly Undetectable steGO (HUGO) scheme, a well known state of the art
 steganographic process in spatial domain.
 Additionally to this effectiveness, 
@@ -127,7 +127,7 @@ somewhat smaller, security than the well known
 Highly Undetectable steGO (HUGO) steganographic scheme.
 This edge-based steganographic approach embeds a Canny
 detection filter, the Blum-Blum-Shub cryptographically secure
-pseudorandom number generator, together with Syndrome-Treillis Codes
+pseudorandom number generator, together with Syndrome-Trellis Codes
 for minimizing distortion.
 After having introduced with details the proposed method,
 we have evaluated it through noise measures (namely, the PSNR, PSNR-HVS-M, 
@@ -147,7 +147,7 @@ be improved by replacing Canny with another edge filter.
 % to take into account the least significant bits too during all the
 % stages of the algorithm, hoping by doing so to be closer to the HUGO scores against 
 % steganalyzers. 
-Other steganalyzers than the ones used in this document will be
+Other steganalysers than the ones used in this document will be
 examined for the sake of completeness. Finally, the
 systematic replacement of all the LSBs of edges by binary digits provided
 by the BBS generator will be investigated, and the consequences of such a 

diff --git a/ourapproach.tex b/ourapproach.tex
index f86c8aead96b49254e4e77ee2f28cb6730fd5857..b007dd00eb14f4b016664f6bce01f0aee64783e8 100644 (file)
--- a/ourapproach.tex
+++ b/ourapproach.tex
@@ -20,7 +20,7 @@ Let us first focus on the data embedding.
       \begin{minipage}{0.49\textwidth}
         \begin{center}
           %\includegraphics[width=5cm]{emb.pdf}
-          \includegraphics[scale=0.5]{emb.ps}
+          \includegraphics[scale=0.45]{emb.ps}
         \end{center}
       \end{minipage}
       \label{fig:sch:emb}
@@ -29,7 +29,7 @@ Let us first focus on the data embedding.
       \begin{minipage}{0.49\textwidth}
         \begin{center}
           %\includegraphics[width=5cm]{rec.pdf}
-          \includegraphics[scale=0.5]{rec.ps}
+          \includegraphics[scale=0.45]{rec.ps}
         \end{center}
       \end{minipage}
       \label{fig:sch:ext}
@@ -118,7 +118,7 @@ and the LSB of pixels if $b$ is 7.
 
 
 Let $x$ be the sequence of these bits. 
-The next  section section presentsd how our scheme 
+The next  section section presents how our scheme 
 adapts  when the size of $x$  is not sufficient for the message $m$ to embed.
 
 
@@ -136,7 +136,10 @@ Practically, a set of edge pixels is computed according to the
 Canny algorithm with an high threshold.
 The message length is thus defined to be less than 
 half of this set cardinality.
-If $x$ is then to short for $m$, the message is splitted into sufficient parts. 
+If $x$ is then to short for $m$, the message is split into sufficient parts
+and a new cover image should be used for the remaining part of the message. 
+
+ 
 In the latter, the embedding rate is defined as a percentage between the 
 number of modified pixels and the length of the bit message.
 This is the classical approach adopted in steganography.
@@ -151,9 +154,11 @@ Two methods may further be applied to select bits that
 will be modified. 
 The first one randomly chooses the subset of pixels to modify by 
 applying the BBS PRNG again. This method is further denoted  as to \emph{sample}.
-The second one is a direct application of the 
+Once this set is selected, a classical LSB replacement is applied to embed the 
+stego content.
+The second method is a direct application of the 
 STC algorithm~\cite{DBLP:journals/tifs/FillerJF11}. 
-It  is further referred to as \emph{adaptive+STC} and is detailled in the nex section.
+It  is further referred to as \emph{STC} and is detailed in the next section.
 
 
 
@@ -177,7 +182,7 @@ It  is further referred to as \emph{adaptive+STC} and is detailled in the nex se
 
 
 
-\subsection{Minimizing Distortion with Syndrome-Treillis Codes}\label{sub:stc}
+\subsection{Minimizing Distortion with Syndrome-Trellis Codes}\label{sub:stc}
 \input{stc}
 
 
@@ -212,19 +217,25 @@ It  is further referred to as \emph{adaptive+STC} and is detailled in the nex se
 
 
 \subsection{Data Extraction}\label{sub:extract}
-The message extraction summarized in Fig.~\ref{fig:sch:ext} follows data embedding
+The message extraction summarized in Fig.~\ref{fig:sch:ext} 
+follows the data embedding approach 
 since there exists a reverse function for all its steps.
-First of all, the same edge detection is applied (on the 7 first bits) to 
-get the set of LSBs,
-which is  sufficiently large with respect to the message size given as a key.  
-Then the STC reverse algorithm is applied to retrieve the encrypted message.
+
+More precisely, the same edge detection is applied on the $b$ first bits  to 
+produce the sequence $y$ of LSBs. 
+If the STC approach has been selected in embedding, the STC reverse
+algorithm is directly executed to retrieve the encrypted message. 
+This inverse function takes the $H$ matrix as a parameter.
+Otherwise, \textit{i.e.} if the \emph{sample} strategy is retained,
+the same random bit selection than in the embedding step 
+is executed with the same seed, given as a key.
 Finally, the Blum-Goldwasser decryption function is executed and the original
 message is extracted.
 
 
 \subsection{Running Example}\label{sub:xpl}
 In this example, the cover image is  Lena 
-which is a 512*512  image with 256 grayscale levels.
+which is a $512\times512$  image with 256 grayscale levels.
 The message is the poem Ulalume (E. A. Poe), which is constituted by 104 lines, 667
 words, and 3754 characters, \textit{i.e.}  30032 bits.
 Lena and the the first verses are given in Fig.~\ref{fig:lena}.
@@ -284,8 +295,8 @@ respectively 7 and 6. These edges are represented in Fig.~\ref{fig:edge}
 
 
 
-In the former configuration, only 9320 bits are available 
-for embeding whereas in the latter we have 9227.
+Only 9320 bits (resp. 9227 bits) are available for embedding 
+in the former configuration where $b$ is 7 (resp. where $b$ is 6).
 In the both case, about the third part of the poem is hidden into the cover.
 Results with \emph{adaptive+STC} strategy are presented in 
 Fig.~\ref{fig:lenastego}.
@@ -317,20 +328,19 @@ Fig.~\ref{fig:lenastego}.
 
 
 Finally, differences between the original cover and the stego images  
-are presented in Fig.~\ref{fig:lenadiff}. For each pixel pair of picel $X_{ij}$  
-$Y_{ij}$, $X$ and $Y$ being the cover and the stego content respectively, 
-The pixel value $V_{ij}$ of the difference is defined with the following map
+are presented in Fig.~\ref{fig:lenadiff}. For each pixel pair of pixel $X_{ij}$ and  $Y_{ij}$ ($X$ and $Y$ being the cover and the stego content respectively), 
+the pixel value $V_{ij}$ of the difference is defined with the following map
 $$
 V_{ij}= \left\{
 \begin{array}{rcl}
 0 & \textrm{if} &  X_{ij} = Y_{ij} \\
-75 & \textrm{if} &  \abs{ (X_{ij} - Y_{ij})} = 1 \\
-75 & \textrm{if} &  \abs{ (X_{ij} - Y_{ij})} = 2 \\
-225 & \textrm{if} &  \abs{ (X_{ij} - Y_{ij})} = 1 
+75 & \textrm{if} &  \abs{ X_{ij} - Y_{ij}} = 1 \\
+150 & \textrm{if} &  \abs{ X_{ij} - Y_{ij}} = 2 \\
+225 & \textrm{if} &  \abs{ X_{ij} - Y_{ij}} = 3 
 \end{array}
-\right.
-$$.
-This function allows to emphase differences between content.
+\right..
+$$
+This function allows to emphasize differences between content.
 
 \begin{figure}[t]
   \begin{center}

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index d853031956ebcb80006ad919e77bfff052aba110..6a35845b01a573f2481d8509029466467bdb8b32 100644 (file)
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+1 setlinewidth
+0 0 0 edgecolor
+newpath 111 147.71 moveto
+111 139.46 111 129.54 111 120.36 curveto
 stroke
 0 0 0 edgecolor
-newpath 287.5 46.41 moveto
-284 36.41 lineto
-280.5 46.41 lineto
+newpath 114.5 120.08 moveto
+111 110.08 lineto
+107.5 120.08 lineto
 closepath fill
 1 setlinewidth
 solid
 0 0 0 edgecolor
-newpath 287.5 46.41 moveto
-284 36.41 lineto
-280.5 46.41 lineto
+newpath 114.5 120.08 moveto
+111 110.08 lineto
+107.5 120.08 lineto
 closepath stroke
 grestore
 endpage
@@ -827,7 +974,7 @@ grestore
 %%EndPage: 1
 %%Trailer
 %%Pages: 1
-%%BoundingBox: 36 36 420 440
+%%BoundingBox: 36 36 365 590
 end
 restore
 %%EOF

diff --git a/schema.dot b/schema.dot
index 62dc32c8db2da5ba24bdc61dac3cb638eb936642..448527e01b0a57d382793287792556098b74b459 100644 (file)
--- a/schema.dot
+++ b/schema.dot
@@ -35,15 +35,16 @@ digraph start_up {
        ED -> cond
        encrypt -> cond
        cond -> condEmb [label="Yes"]
+       cond -> condStrat [label="No"]
 
        condEmb -> STC [label="Yes"]
        condEmb -> sample [label="No"]
 
 
 
-       cond -> condStrat [label="No"]
-       condStrat -> PI [label="No"]
        condStrat -> ee [label="Yes"]
+       condStrat -> PI [label="No"]
+
        ee -> ED
        
        PI -> ED
@@ -53,6 +54,6 @@ digraph start_up {
        
        emb -> end
 
-
+       key -> sample
 
         }
\ No newline at end of file

diff --git a/schema2.dot b/schema2.dot
index 6c8a0ae8eefad782eb698e8c47526216b44e64ca..2af819420bd2206c12f9e248a5b67d1f0a0f57c6 100644 (file)
--- a/schema2.dot
+++ b/schema2.dot
@@ -9,7 +9,9 @@ digraph start_up {
        node [style = rounded, shape = rect] ED [label="y=edgeDetection(b bits)"]  
        node [style = rounded, shape = rect] decrypt [label="message=decryption(m)"]             
 
+       node [style = "", shape = diamond] condEmb [label="Use of STC"]; 
 
+       node [style = rounded, shape = rect] sample [label= "m=sample(y)"]      
 
        start -> SI
        start -> PIb
@@ -21,9 +23,14 @@ digraph start_up {
        start -> key 
 
        SI -> ED
-       ED -> STC 
+       ED -> condEmb 
+
+       condEmb -> STC [label="Yes"]
+       condEmb -> sample [label="No"]
+       key -> sample
        
        STC -> decrypt
+       sample -> decrypt
        key -> decrypt
        decrypt -> end