Next, following~\cite{Luo:2010:EAI:1824719.1824720}, our scheme automatically
modifies the Canny algorithm
parameters to get a sufficiently large set of edge bits: this
-one is practically enlarged untill its size is at least twice as many larger
+one is practically enlarged until its size is at least twice as many larger
than the size of embedded message.
% Edge Based Image Steganography schemes