\usetikzlibrary{calc,trees,positioning,arrows,chains,shapes.geometric,%
decorations.pathreplacing,decorations.pathmorphing,shapes,%
matrix,shapes.symbols,plotmarks,decorations.markings,shadows,backgrounds}

\def\MVE{\mbox{MVE}}
\def\MVBASE{\mbox{BASE\_MC}}
\def\INTERVIEW{\mbox{INTERVIEW\_COPY}}
\def\COMBMC{\mbox{COMB\_MC}}
\def\COMBMCDISP{\mbox{COMB\_MC\_Disp}}

% Define block styles
\tikzstyle{block} = 		[rectangle, draw,	text width=6cm, text centered, minimum height=1.5cm, node distance=2.3cm]
\tikzstyle{node_circle} =	[circle, draw, text centered]
\tikzstyle{decision} =		[diamond, draw,	text badly centered, inner sep=1pt, text width=2cm, node distance=2.8cm]
\tikzstyle{line} = 		[draw, -latex']

\newcommand{\scale}{0.7}

\begin{tikzpicture}[node distance = 2.5cm, auto,every node/.style={minimum size=\scale,scale=\scale},scale=\scale]
    % Place nodes

	\node [decision] at (0,0) (Indentify) {\small Identifying corrupted frame};

	\node [block,ellipse, text width=2.5cm,above of=Indentify,yshift=0.7cm] (Start) {Frame Start};

	\path [line] (Start) -- (Indentify);

	\node [block,below of=Indentify,yshift=-0.7cm] (Divide) {The frame is divided into $4\times4$ blocks};
	
	\path [line] (Indentify) -- (Divide);

	\node [block,below of=Divide] (Normalization) {Motion vector normalization};
	
	\path [line] (Divide) -- (Normalization);

	\node [block, below of=Normalization] (Differences) {Calculating motion vector differences (MVD)};

	\path [line] (Normalization) -- (Differences);

	\node [block, right of=Indentify, xshift=5cm,yshift=1.4cm] (Recursive) {Recursive motion vector difference and refinement area selection};
	
	\path [line] (Differences.south) -- +(0,-1) -- +(7.8/2,-1) -- +(7.8/2,11+0.8) -| (Recursive.north);

	\node [block, below of=Recursive] (Iterative) {Iterative counting the occurrences of MVD};
	
	\path [line] (Recursive) -- (Iterative);

	\node [block,below of=Iterative] (Selection) {The MVD with maximum occurrence is individually selected in x and y directions};

	\path [line] (Iterative) -- (Selection);

	\node [block,below of=Selection] (FinalMV) {Final motion vector is derived by adding the refined MVD};
	
	\path [line] (Selection) -- (FinalMV);

	\node [block,ellipse, text width=2.5cm,below of=FinalMV, yshift=0cm] (End) {End of frame};

	\path [line] (FinalMV) -- (End);

\end{tikzpicture}