macroidct2.m

来自「用matlab写的仿真H.263标准的程序」· M 代码 · 共 25 行

function IDctData = MacroIDct2(DQCoeff)
%宏块级的二维反余弦变换
%输入 DQCoeff:16x16,double
%输出 IDctData: 16x16, double

%检查输入参数个数
msg = nargchk(1,1,nargin);

if ~(isempty(msg)) %检查输入参数是否为1个
    disp(msg)
    return ;
end

[M,N] = size(DQCoeff);
if M ~= 16 || N ~= 16
    disp('输入参数维数不对');
    return ;
end

BlockData0 = idct2(DQCoeff(1:8,1:8));
BlockData1 = idct2(DQCoeff(1:8,9:16));
BlockData2 = idct2(DQCoeff(9:16,1:8));
BlockData3 = idct2(DQCoeff(9:16,9:16));

IDctData = [BlockData0,BlockData1;BlockData2,BlockData3];