From: couchot Date: Mon, 24 Jun 2013 20:03:55 +0000 (+0200) Subject: extraction améliorée, ajout de mesure de qualité sur lena et quelques typos X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/canny.git/commitdiff_plain/a0f4d76521ca0d84f0de9ba71ecb094fc9e1af33?ds=inline;hp=-c extraction améliorée, ajout de mesure de qualité sur lena et quelques typos --- a0f4d76521ca0d84f0de9ba71ecb094fc9e1af33 diff --git a/emb.ps b/emb.ps index 37a2205..ff26651 100644 --- a/emb.ps +++ b/emb.ps @@ -178,11 +178,11 @@ def %%EndSetup setupLatin1 %%Page: 1 1 -%%PageBoundingBox: 36 36 601 722 +%%PageBoundingBox: 36 36 657 722 %%PageOrientation: Portrait 0 0 1 beginpage gsave -36 36 565 686 boxprim clip newpath +36 36 621 686 boxprim clip newpath 1 1 set_scale 0 rotate 40 41 translate % PI gsave @@ -237,66 +237,66 @@ grestore gsave 1 setlinewidth 0 0 0 nodecolor -newpath 215 522 moveto -55 522 lineto +newpath 199 522 moveto +39 522 lineto stroke 1 setlinewidth 0 0 0 nodecolor -newpath 55 522 moveto 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0 edgecolor 14 /Times-Roman set_font -477 207.4 moveto 19 (No) alignedtext +505 207.4 moveto 19 (No) alignedtext grestore endpage showpage @@ -1208,7 +1230,7 @@ grestore %%EndPage: 1 %%Trailer %%Pages: 1 -%%BoundingBox: 36 36 601 722 +%%BoundingBox: 36 36 657 722 end restore %%EOF diff --git a/experiments.tex b/experiments.tex index 9da4704..8337d55 100644 --- 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 e385cc9..deecdb7 100644 --- 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 42afe92..5a7e01e 100755 --- 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 f86c8ae..b007dd0 100644 --- 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} diff --git a/rec.ps b/rec.ps index d853031..6a35845 100644 --- a/rec.ps +++ b/rec.ps @@ -178,646 +178,793 @@ def %%EndSetup setupLatin1 %%Page: 1 1 -%%PageBoundingBox: 36 36 420 440 +%%PageBoundingBox: 36 36 365 590 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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 6c8a0ae..2af8194 100644 --- 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