getblockfromframe.m

用matlab写的仿真H.263标准的程序

function Block = GetBlockFromFrame(Frame,BAddrRow,BAddrCol)
%从给定格式的Frame中得到指定的块
%输入 Frame，目标帧
%输入 BAddrRow, BAddrRow,块索引
%输出 Block，指定8x8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 = (BAddrRow - 1) * 8 + 1;
indexcol = (BAddrCol - 1) * 8 + 1;

Block = uint8(Frame(indexrow:indexrow + 7,...
              indexcol:indexcol + 7));