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[canny.git] / stc.tex

diff --git a/stc.tex b/stc.tex
index f87104b0bc8f3c3f17d744ba4bb3f9ad74a984c5..26ac732cb1805fe186b11981e1fcfb57283d9d5a 100644 (file)
--- a/stc.tex
+++ b/stc.tex
@@ -1,5 +1,5 @@
 To make this article self-contained, this section recalls
 To make this article self-contained, this section recalls

-basis of the Syndrome Treillis Codes  (STC).
+the basis of the Syndrome Treillis Codes  (STC).

 Let 
 $x=(x_1,\ldots,x_n)$ be the $n$-bits cover vector of the image $X$, 
 $m$ be the message to embed, and 
 Let 
 $x=(x_1,\ldots,x_n)$ be the $n$-bits cover vector of the image $X$, 
 $m$ be the message to embed, and 


@@ -19,7 +19,7 @@ Furthermore this code provides a vector $y$ s.t. $Hy$ is equal to
 $m$ for a given binary matrix $H$. 
 
 Let us explain this embedding on a small illustrative example where
 $m$ for a given binary matrix $H$. 
 
 Let us explain this embedding on a small illustrative example where

-$\rho_X(i,x,y)$ is identically equal to 1,
+$\rho_X(i,x,y)$ is equal to 1,

 whereas $m$ and $x$ are respectively  a 3 bits column
 vector and a 7 bits column vector. 
 Let then $H$ be the binary Hamming matrix  
 whereas $m$ and $x$ are respectively  a 3 bits column
 vector and a 7 bits column vector. 
 Let then $H$ be the binary Hamming matrix  


@@ -68,12 +68,12 @@ is a practical solution to this complexity. Thanks to this contribution,
 the solving algorithm has a linear complexity with respect to $n$.
 
 First of all, Filler \emph{et al.} compute the matrix $H$
 the solving algorithm has a linear complexity with respect to $n$.
 
 First of all, Filler \emph{et al.} compute the matrix $H$

-by placing a small sub-matrix $\hat{H}$ of size $h × w$ next
-to each other and shifted down by one row. 
+by placing a small sub-matrix $\hat{H}$ next
+to each other and by shifting down by one row. 

 Thanks to this special form of $H$, one can represent
 Thanks to this special form of $H$, one can represent

-every solution of  $m=Hy$ as a path through a trellis.
+any solution of  $m=Hy$ as a path through a trellis.

 
 

-Next, the  process of finding $y$ consists of two stages: a forward and a backward part.
+Next, the  process of finding $y$ consists in two stages: a forward and a backward part.

 \begin{enumerate}
 \item Forward construction of the trellis that depends on $\hat{H}$, on $x$, on $m$, and on $\rho$.
 \item Backward determination of $y$ that minimizes $D$, starting with 
 \begin{enumerate}
 \item Forward construction of the trellis that depends on $\hat{H}$, on $x$, on $m$, and on $\rho$.
 \item Backward determination of $y$ that minimizes $D$, starting with