macroquant.m

来自「用matlab写的仿真H.263标准的程序」· M 代码 · 共 33 行

function QCoeff = MacroQuant(DCoeff,Qp)
%宏块级的量化
%输入 DCoeff:16x16,double
%输入 Qp:int32
%输出 QCoeff: 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(DCoeff);
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);

BlockQCoeff0 = BlockQuant263(DCoeff(1:8,1:8),double_qp);
BlockQCoeff1 = BlockQuant263(DCoeff(1:8,9:16),double_qp);
BlockQCoeff2 = BlockQuant263(DCoeff(9:16,1:8),double_qp);
BlockQCoeff3 = BlockQuant263(DCoeff(9:16,9:16),double_qp);

QCoeff = [BlockQCoeff0,BlockQCoeff1;BlockQCoeff2,BlockQCoeff3];