macrodequant.m

用matlab写的仿真H.263标准的程序

function MacroCoeff = MacroDequant(MacroQCoeff,Qp)
%宏块级的量化
%输入 MacroQCoeff:16x16,double
%输入 Qp:int32
%输出 MacroCoeff: 16x16, double

%检查输入参数个数
msg = nargchk(2,2,nargin);

if ~(isempty(msg)) %检查输入参数是否为2个
    disp(msg)
    return ;
end

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

if isequal(Qp,0)
    disp('error:Qp = 0.It should be forbidded');
    return ;
end

double_qp = double(Qp);

BlockCoeff0 = BlockDequant263(MacroQCoeff(1:8,1:8),double_qp);
BlockCoeff1 = BlockDequant263(MacroQCoeff(1:8,9:16),double_qp);
BlockCoeff2 = BlockDequant263(MacroQCoeff(9:16,1:8),double_qp);
BlockCoeff3 = BlockDequant263(MacroQCoeff(9:16,9:16),double_qp);

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