getmacroblockfromframe.m

用matlab写的仿真H.263标准的程序

function MacroBlock = GetMacroBlockFromFrame(Frame,MAddrRow,MAddrCol)
%从给定格式的Frame中得到指定的宏块
%输入 Frame，目标帧,uint8
%输入 MAddrRow, MAddrRow,宏块索引
%输出 MacroBlock，指定宏块，uint8

msg = nargchk(3,3,nargin);

if ~(isempty(msg)) %检查输入参数是否为3个
    disp(msg)
    return ;
end
indexrow = (MAddrRow - 1) * 16 + 1;
indexcol = (MAddrCol - 1) * 16 + 1;

MacroBlock = uint8(Frame(indexrow:indexrow + 15,...
                   indexcol:indexcol + 15));