getwindowsfromrframe.m

用matlab写的仿真H.263标准的程序

function Windows = GetWindowsFromRFrame(RFrame,MAddrRow,MAddrCol,Format)
%从给定格式的RFrame中得到指定的窗口
%输入 RFrame，目标帧,uint8
%输入 MAddrRow, MAddrRow,宏块索引
%输入 Format,窗口类型 'Y48',返回48x48亮度窗口，'UV24'返回24x24色度窗口
%输出 Windows，指定窗口，uint8

msg = nargchk(4,4,nargin);

if ~(isempty(msg)) %检查输入参数是否为4个
    disp(msg)
    return ;
end

switch Format
    case 'Y48'
        indexrow = (MAddrRow - 1) * 16 + 1;
        indexcol = (MAddrCol - 1) * 16 + 1;
        Windows = uint8(RFrame(indexrow:indexrow + 47,...
                        indexcol:indexcol + 47));
    case 'UV24'
        indexrow = (MAddrRow - 1) * 8 + 1;
        indexcol = (MAddrCol - 1) * 8 + 1;
        Windows = uint8(RFrame(indexrow:indexrow + 23,...
                        indexcol:indexcol + 23));     
     otherwise
        disp('error format');
end