macrodct2.m

用matlab写的仿真H.263标准的程序

function Dct2Coeff = MacroDct2(Dct2Data)
%宏块级的二维余弦变换
%输入 Dct2Data:16x16,uint8
%输出 Dct2Coeff: 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3个
    disp(msg)
    return ;
end

[M,N] = size(Dct2Data);
if M ~= 16 || N ~= 16
    disp('输入参数维数不对');
    return ;
end

BlockCoeff0 = dct2(Dct2Data(1:8,1:8));
BlockCoeff1 = dct2(Dct2Data(1:8,9:16));
BlockCoeff2 = dct2(Dct2Data(9:16,1:8));
BlockCoeff3 = dct2(Dct2Data(9:16,9:16));

Dct2Coeff = [BlockCoeff0,BlockCoeff1;BlockCoeff2,BlockCoeff3];