getmacroblockfromframe.asv

用matlab写的仿真H.263标准的程序

function MacroBlock = GetMacroBlockFromFrame(Frame,FrameRow,FrameCol,MAddrRow,MAddrCol)
%从给定格式的Frame中得到指定的宏块
%输入 Frame，目标帧
%输入 FrameRow,FrameCol,帧的总行数和总列数
%输入 MAddrRow, MAddrRow,宏块索引

msg = nargchk(5,5,nargin);

if ~(isempty(msg)) %检查输入参数是否为5个
    disp(msg)
    return ;
end
indexrow = (MAddrRow - 1)
MacroBlock = Frame(MAddrRow*16:MAddrRow*16 + 16,...
                   MAddrCol*16:MAddrCol + 16)

for i = 1:8
    for j = 1:8
        Block(i,j) = MacroBlock(offset_r + i,offset_c + j);
    end
end