Article: scan line defined

Article/notions.tex

@@ -62,9 +62,9 @@ also based on digital straight lines is also used in this work.
 
 \begin{definition}
 A directional scan $DS$ is an ordered partition restricted to the image
-domain $\mathcal{I}$ of a digital straight line $\mathcal{D}$,
-called the {\it scan strip}, into scans $S_i$, each of them being a segment
-of a naive line $\mathcal{N}_i$ orthogonal to $\mathcal{D}$.
+domain $\mathcal{I}$ of a digital straight line $\mathcal{D}$, called the
+{\it scan strip}, into scans $S_i$, each of them being a segment of a naive
+line $\mathcal{N}_i$, called a {\it scan line}, orthogonal to $\mathcal{D}$.
 \end{definition}
 
 \begin{equation}